Renishaw TP20 system Probe module changing touch-trigger probe, MCR20 kit Probe module change rack, MSR1 kit Module storage rack Installation and user’s guide

Installation and user’s guide

H-1000-5008-03-B

TP20 system

© 1998 - 2007 Renishaw plc. All rights reserved.

This document may not be copied or reproduced in whole or in part, or transferred to any other media or language, by any means, without the prior written permission of Renishaw.

The publication of material within this document does not imply freedom from the patent rights of Renishaw plc.

Disclaimer

Considerable effort has been made to ensure that the contents of this document are free from inaccuracies and omissions. However, Renishaw makes no warranties with respect to the contents of this document and specifi cally disclaims any implied warranties. Renishaw reserves the right to make changes to this document and to the product described herein without obligation to notify any person of such changes.

Trademarks

RENISHAW® and the probe emblem used in the RENISHAW logo are registered trademarks of Renishaw plc in the UK and other countries.

apply innovation is a trademark of Renishaw plc.

All other brand names and product names used in this document are trade names, service marks, trademarks, or registered trademarks of their respective owners.

Renishaw part no: H-1000-5008-03-B

Issued: 0 3 2007

TP20 system

installation and user’s guide

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4 Care of equipment

Care of equipment

Renishaw probes and associated systems are precision tools used for obtaining precise measurements and must therefore be treated with care.

Changes to equipment

Renishaw reserves the right to improve, change or modify its hardware or software without incurring any obligations to make changes to

Renishaw equipment previously sold.

Warranty

Renishaw plc warrants its equipment provided that it is installed exactly as defi ned in associated Renishaw documentation.

Prior consent must be obtained from Renishaw if non-Renishaw equipment (e.g. interfaces and/or cabling) is to be used or substituted for Renishaw equipment. Failure to comply with this will invalidate the

Renishaw warranty.

Claims under warranty must be made from authorised service centres only, which may be advised by the supplier or distributor.

Patents

Aspects of the TP20 probing system and aspects of similar systems are the subject of the following patents and patent applications.

EP 548328

EP 750171

EP 501710

EP 826136

EP 566719

JP 3294269

JP 2,510,804

JP 505,622/1999

US 5,323,540

US 5,505,005

US 5,327,657

US 5,404,649

US 5,339,535

US 5,918,378

US 6012230

Limitations of use 5

!

CAUTION: One option of the TP20 probe system uses a magnetically-actuated inhibit system. It is important to apply the following limitations when using the inhibit version TP20.

Neglecting to do so may result in failure of the probe to trigger.

1. The inhibit TP20 may not be armed at a distance of up to 100 mm from the front of the MCR20 probe module change rack.

2. Do not use the inhibit TP20 to gauge magnetised parts or parts held in magnetic fi xtures.

3. Do not use the Renishaw PE series extension bars with the inhibit TP20 unless they have been fully de-magnetised.

In all these instances the use of the non-inhibit TP20 probe body will ensure that the probe system operates fully.

!

CAUTION: The TP20 non-inhibit probe can only be used for automatic stylus changing using the MCR20 probe module change rack when the probe inhibit is controlled by the CMM.

In the case of any uncertainty, do not attempt to perform automatic stylus changing with a TP20 non-inhibit probe and an MCR20 until the CMM supplier has checked the CMM for compliance to this requirement.

6

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Contents 7

Contents

2.1 The TP20 touch-trigger probe kit ........................................ 11

2.2 The MCR20 probe module changing rack kit ..................... 16

2.3 The MSR1 module storage rack kit .................................... 19

3.1 Fitting the TP20 probe onto a probe head .......................... 20

3.2 Fitting a stylus onto the probe module ............................... 20

3.3 Fitting the probe module and stylus onto the probe body ......................................................................... 22

3.4 Mounting the MCR20 onto the CMM .................................. 23

3.5.1 Aligning the MCR20 to the CMM axes .................. 26

3.5.2 Establishing the docking depth (Y) ........................ 26

3.5.3 Establishing the docking height (Z) ....................... 27

3.5.4 Establishing the docking centre for port 1 ............. 28

3.5.5 Establishing the docking centre for ports 2 to 6 ..... 29

3.5.6 Establishing the docking target co-ordinates ......... 29

3.6 Mounting the MSR1 onto the CMM .................................... 30

3.6.1 Mounting the MSR1 onto a CMM table ................. 30

3.6.2 Mounting the MSR1 onto a wall ............................. 32

4.1 Storing and changing probe modules ................................ 33

4.1.1 Calculating the safe clearance position ................. 34

8 Contents

4.1.2 Storing a probe module ......................................... 34

4.1.3 Picking up a stored probe module ......................... 36

4.1.4 Summary of probe module changing procedure ... 37

4.1.5 Using the MSR1 module storage rack ................... 37

5 Technical data - TP20 probe module changing touch-trigger probe ...................................................................... 38

5.1.1 Probing forces and overtravel limits ....................... 39

5.1.2 Probe module changing repeatability .................... 39

6 Technical data - MCR20 probe module change rack .................. 41

7 Technical data - MSR1 module storage rack ............................... 42

8.1.1 The low force probe module .................................. 44

8.1.2 The standard force probe modules ........................ 44

8.1.3 The medium force probe module ........................... 44

8.1.4 The extended force probe module ......................... 44

8.1.5 The 6-way probe module ....................................... 44

Introduction 9

1 Introduction

This installation and user’s guide supports the following Renishaw products (see fi gure 1):

• The TP20 probe module changing touch-trigger probe (inhibit and non inhibit versions)

• The MCR20 probe module change rack (automatic operation)

• The MSR1 module storage rack (manual operation)

The Renishaw TP20 probe module changing touch-trigger probe is a 5-way or 6-way kinematic probe with the facility to change stylus confi gurations without the need for re-qualifi cation. A direct replacement for the industry-proven Renishaw TP2, the TP20 can be easily retrofi tted into existing TP2 applications to bring this additional facility to both manual and DCC co-ordinate measuring machines

(CMMs).

The TP20 comprises a two-piece design – a probe body (with or without magnetic actuation device) and detachable probe module(s).

TP20 probe modules can be stored in the MSR1 for manually exchanging the probe modules, or in the MCR20 where automatic changing of the probe module(s) is possible under measurement program control.

Forming part of Renishaw’s comprehensive CMM touch-trigger probe range, the TP20 is fully compatible with all Renishaw M8 probe heads, including those fi tted with the Renishaw autojoint incorporating

Renishaw’s PAA range of adaptors and extension bars. Wherever necessary, probe reach may be increased in M8 applications by use of the Renishaw PEL range of extension bars.

10 Introduction

Further information on these products may be obtained by reading the probing systems for co-ordinate measuring machines technical specifi cations (Renishaw part number H 1000 5050), available from your supplier or from Renishaw’s website, www.renishaw.com.

MCR20 probe module change rack

TP20 probe module changing touchtrigger probe

Figure 1 - The TP20 probe module changing probe system

Product description 11

2.1 The TP20 touch-trigger probe kit

The standard Renishaw TP20 touch-trigger probe kit (see fi gure 2) comprises the following primary components:

• One or two TP20 probe modules (see page 10 for available combinations)

• Probe and stylus tools

The probe body incorporates a standard Renishaw M8 × 1.25 screw connector mount and is designed to house the mating half of the probe module’s kinematic coupling.

The TP20 inhibit probe body

This contains the magnetic proximity switch necessary to inhibit triggering of the probe during automatic changing of the probe modules.

The TP20 non-inhibit probe body

This probe body does not include the magnetic proximity switch and so can be used for any application, including those where strong magnetic fi elds are present.

12 Product description

SF/LF/MF/EF

M8 × 1.25

6W EM1 STD EM2 STD

13.2 mm

38 mm

42 mm

88 mm

113 mm

TP20 non inhibit probe module changing touchtrigger probe

‘C’ spanner locations

Probe body

Probe module

Alignment marks

Magnetically-held kinematic coupling

Front ring

Probe module change rack location groove

Colour-coded cap

Low force - green

Standard force - black

Medium force - grey

Extended force - brown

6-way - blue

M2 stylus (supplied with MCR20 rack kit)

Figure 2 - The TP20 probe module changing touch-trigger probe

Product description 13

Each probe module, which houses the kinematic switching touch sensor mechanism, carries the stylus assembly and provides overtravel in the X, Y and +Z axes (–Z is offered when using the TP20

6-way probe module). Incorporating an M2 stylus mounting, each probe module is compatible with Renishaw’s comprehensive range of

M2 styli.

Designed to minimise the possibility of probe module misalignment generating a probe ‘seated’ signal, the probe module is held in position by a magnetically retained, highly repeatable kinematic coupling.

Electrical contact pins conduct the probe sense voltage through the coupling.

Trigger force options

The standard force probe module is suitable for most applications

(when used with the recommended stylus range), but sometimes the effects of stylus length and mass, combined with machine acceleration and vibration, can cause the probe to false trigger (these are referred to as ‘spurious triggers’).

To allow the TP20 to be used on co-ordinate measuring machines where acceleration forces or vibration would otherwise result in spurious touches, a choice of higher force probe modules is available.

A low force probe module is also available for measurement of delicate materials. Refer to the applications guide later in this document for information on how to select the correct probe module for your application.

14 Product description

The type of probe modules supplied with your probe will be clearly marked on each probe module’s front ring. The probe modules also carry a colour-coded front cap as follows:

• Low force (LF) probe module (green cap)

• Standard force (SF) probe module (black cap)

• Medium force (MF) probe module (grey cap)

• Extended force (EF) probe module (brown cap)

• 6-way (6W) probe module (blue cap)

• Extension module 1 standard force (EM1 STD) (black cap)

• Extension module 2 standard force (EM2 STD) (black cap)

Product description 15

The following TP20 probe kits are available from your supplier:

Part number

Inhibit probe body

Non-inhibit probe body

A-1371-0290 A-1371-0640

A-1371-0291 A-1371-0641

A-1371-0292 A-1371-0642

A-1371-0293 A-1371-0643

A-1371-0294 A-1371-0644

A-1371-0295 A-1371-0645

A-1371-0428 A-1371-0603

A-1371-0429 A-1371-0604

A-1371-0370 A-1371-0656

A-1371-0371 A-1371-0657

A-1371-0372 A-1371-0658

A-1371-0390 A-1371-0602

Probe body PLUS the following probe modules

LF SF MF EF

2

1

1

1

1

2

1 1

2

1

1

1

1

1

1

1

1

All probe kits contain:

• Probe body - inhibit or non-inhibit as selected from the table

• Number and type of probe modules as given in the table

• TP20 system installation and user’s guide (H-1000-5008)

• S1 spanner

• S9 double-ended ‘C’ spanner

• S7 stylus tools (× 2)

• CK200 cleaning material

16 Product description

The following TP20 probe module kits are available from your supplier:

TP20 probe module kit

(probe module only)

Low force probe module

Standard force probe module

Medium force probe module

Extended force probe module

6-way probe module

EM1 STD probe module

EM2 STD probe module

EM1 STD and EM2 STD probe modules

Part number

A-1371-0392

A-1371-0270

A-1371-0271

A-1371-0272

A-1371-0419

A-1371-0430

A-1371-0431

A-1371-0432

2.2 The MCR20 probe module changing rack kit

NOTE: Renishaw supplies eight types of MCR20 probe module changing rack kit, each kit providing a different combination of probe modules. See page 14 for the range of kits offered.

The MCR20 probe module changing rack kit (see fi gure 3) comprises the following primary components:

• One Renishaw MCR20 probe module changing rack

• One Renishaw SCR200 mounting kit

• One location piece

• One Renishaw PS2R stylus

• Two Renishaw TP20 probe modules (probe module combination supplied will depend on part number of kit)

Product description 17

The MCR20 probe module changing rack, which can be easily mounted onto a CMM using the Renishaw SCR200 mounting kit and location piece, is designed to securely hold stored probe modules for automatic changing, and to protect these stored probe modules from airborne contaminants that may be present within the working environment. Only seven datum points are needed to set the MCR20 rack alignment and probe module changing co-ordinates.

200 mm

15 mm

60 mm

145 mm

55 mm

Figure 3 - The MCR20 probe module change rack

When using the rack, the inhibit version of the TP20 probe must be used. By generating a magnetic fi eld about the front of each docking port lid, the MCR20 effectively ‘closes’ the probe’s inhibit switch during a probe module changing cycle. Rack function is completely passive and no electrical input is required.

18 Product description

During automatic changing of probe modules, limited crash protection is provided by hinged overtravel mechanisms incorporated within both the base and the docking port assembly of the MCR20. Provided any collision occurs in the direction of overtravel, the hinged overtravel mechanisms can be manually reset and it should not normally be necessary to re-datum the rack.

MCR20 probe module changing rack kits are available with the following combinations of probe modules and may be ordered from your supplier:

MCR20 kit number

1

2

3

4

5

6

7

8

LF

1

1

Probe modules in kit

SF MF

2

1

1

1

2

1

EF

1

1

2

1

1

Part number

A-1371-0261

A-1371-0262

A-1371-0263

A-1371-0264

A-1371-0265

A-1371-0266

A-1371-0267

A-1371-0268

Product description 19

2.3 The MSR1 module storage rack kit

The optional MSR1 module storage rack kit, shown in fi gure 4, is not supplied with any TP20 probe modules. It is available in two different mounting options (please refer to the installation section for details).

The two different versions can be ordered from your supplier under the following part numbers:

Mounting option

CMM table mounted

Wall mounted

Part number

A-1371-0347

A-1371-0330

Figure 4 - The MSR1 module storage rack - CMM table mounted

(modules and styli not supplied)

20 Product installation

3.1 Fitting the TP20 probe onto a probe head

To fi t the TP20 probe onto a probe head, carry out the following procedure (see fi gure 5):

1. By hand, screw the threaded end of the probe body into the M8 bush of the probe head and hand-tighten to secure.

2. Fit the S1 ‘C’ spanner (supplied) onto the probe body as shown in

Figure 5.

3. Using the S1 ‘C’ spanner, fully hand-tighten the probe body into the M8 bush (0.3 Nm – 0.5 Nm).

3.2 Fitting a stylus onto the probe module

To fi t a stylus onto the probe module, carry out the following procedure

(see fi gure 5):

NOTE: For advice on both stylus and probe module selection, refer to the applications guide later in this publication.

1. Ensuring that you have selected the correct probe module for your given application (see probe module selection later in this guide), screw the threaded end of your chosen stylus into the M2 stylus mount of the probe module and hand-tighten to secure.

Product installation

2. Using the type S7 stylus tools provided, or type S20 spanner if fi tting a stylus from the Renishaw GF range, fully hand-tighten the stylus into the stylus mount to achieve the recommended tightening torque of between 0.05 Nm and 0.15 Nm (maximum permissible torque is 0.3 Nm).

21

M8 bush

S1 ‘C’ spanner

Probe body

Probe module S7 stylus tool

M2 stylus

Figure 5 - Fitting the TP20 probe onto a probe head

22 Product installation

3.3 Fitting the probe module and stylus onto the probe body

To fi t the probe module and stylus onto the probe body, carry out the following procedure (see fi gure 6):

1. Visually examine the mating faces of both the probe module and the probe head for cleanliness; where necessary, clean the mating surfaces using the CK200 cleaning kit (supplied).

2. Offer up the probe module to the probe body and, ensuring the three alignment marks on both the probe module and probe body are correctly aligned, allow the probe module to engage the probe body under magnetic force.

Alignment marks

Alignment marks

Figure 6 - Fitting the probe module and stylus onto the probe body

Product installation

3.4 Mounting the MCR20 onto the CMM

To mount the MCR20 probe module change rack onto your CMM, carry out the following procedure (see fi gure 7):

23

!

CAUTION: For optimum crash protection, it is recommended that the MCR20 is mounted as close as possible to the extreme edge of the CMM’s operating envelope.

1. Place the location piece in the desired position on the CMM table and secure in place using the M8/M10 bolt and washer supplied.

Using the appropriate Allen key (supplied), fully hand-tighten the

M8/M10 bolt into the threaded insert within the CMM table.

NOTES: Whilst the TP20 system does not require that the MCR20 is aligned with the CMM axes, ease of programming or software constraints may make alignment with the CMM axes desirable.

The MCR20 is not designed for horizontal operation with the ports in a vertical orientation.

24 Product installation

MCR rack

Lower base

M3 cone point grub screw

1.5 mm hexagonal key

Location piece

M8/M10 bolt and washer

Figure 7 - Mounting the MCR20 onto a CMM

2. Mount the lower base of the MCR20 probe module change rack over the location piece and rotate the X axis of the rack until the required alignment is obtained.

3. Using the 1.5 mm hexagonal key supplied, fully hand-tighten the

M3 cone point grubscrew (0.5 Nm – 1.0 Nm) to lock the MCR20 in position.

Product installation 25

!

WARNINGS: The use of eye protection is recommended.

Pinch hazards exist between parts and between moving and static parts. Beware of unexpected movement. You should remain outside the full working envelope of probe head/ extension bar/probe combinations.

It is the machine supplier’s responsibility to ensure that the user is made aware of any hazards involved in operation, including those mentioned in Renishaw product documentation, and to ensure that adequate guards and safety interlocks are provided.

Under certain circumstances, the probe signal may falsely indicate a probe seated condition. Do not rely on probe signals to stop the machine.

NOTES: Renishaw recommends that datuming of the MCR20 is performed using the Renishaw PS2R stylus supplied. If a different stylus is to be used, the length (L) must be either 20 mm or 30 mm and the appropriate ball radius (R) must be used to calculate offsets.

It is strongly recommended that the EM1 STD and EM2 STD probe extension modules are not used for datuming of the MCR20, as the extended probe length may lead to increased concentricity errors within the probe system.

The following instructions assume that uncompensated probing points are taken, and therefore that the target positions for port docking are absolute machine co-ordinates.

26 Product installation

3.5.1 Aligning the MCR20 to the CMM axes

To align the MCR20 probe module changing rack to the axes of your

CMM, carry out the following procedures (see fi gure 8):

1. Latch all port lids in their open position by pushing each lid fully open and engaging the locking pegs into the slots in the docking plate.

2. Take points P1 and P2.

3. Using the 1.5 mm hexagonal key supplied, fully release the M3 cone point grubscrew within the base of the MCR20 (refer to fi gure 7 for screw location).

4. Adjust the orientation of the MCR20 until the runout between points P1 and P2 is less than 0.25 mm. Retaining the MCR20 in this position, re-tighten the M3 cone point grubscrew (0.5 Nm

– 1.0 Nm) using the 1.5 mm hexagonal key supplied.

3.5.2 Establishing the docking depth (Y)

To establish the docking depth (Y) of the MCR20 ports, carry out the following procedure (see fi gure 8):

1. Take points P1 and P2.

2. Establish the docking depth for all ports using the following formula:

{Y value of line P1/P2 + R (1 mm) + 8.75 mm} where R = stylus ball radius

Product installation 27

3.5.3 Establishing the docking height (Z)

To establish the docking height (Z) of the MCR20 ports, carry out the following procedure (see fi gure 8):

1. Take points P3, P4 and P5. From the three points taken, construct a Z axis plane for the rack.

2. Establish the docking height for all ports using the following formula:

{Z value of plane P3/P4/P5 – L (20 mm) – R (1 mm) – 21.25 mm} where L = stylus length

P3

P4

P5

P1

Z+

Y+

X+

P2

Figure 8 - Datuming the MCR20 probe module changing rack

28 Product installation

3.5.4 Establishing the docking centre for port 1

To establish the docking centre for port 1 (X1), carry out the following procedure (see fi gure 9):

NOTE: The stylus shank may be used to take points P6 and P7.

1. Take points P6 and P7.

2. Establish the docking centre for port 1 (X1) using the following formula:

{centre point of P6/P7 = X1}

P7

P6

Figure 9 - Establishing the docking centres

Product installation 29

3.5.5 Establishing the docking centre for ports 2 to 6

To establish the docking centre for ports 2 (X2) to 6 (X6), perform the following calculations:

Docking centre port 2 (X2) = X1 + 30 mm

Docking centre port 3 (X3) = X2 + 30 mm

Docking centre port 4 (X4) = X3 + 30 mm

Docking centre port 5 (X5) = X4 + 30 mm

Docking centre port 6 (X6) = X5 + 30 mm

3.5.6 Establishing the docking target co-ordinates

!

CAUTION: The Y values may be different for each port if the

MCR20 is not aligned with the CMM axes.

To establish the docking centre co-ordinates of ports 1 (X1) to 6 (X6), perform the following calculations:

Port 1 = X1, Y, Z

Port 2 = X2, Y, Z

Port 3 = X3, Y, Z

Port 4 = X4, Y, Z

Port 5 = X5, Y, Z

Port 6 = X6, Y, Z

30 Product installation

3.6 Mounting the MSR1 onto the CMM

!

CAUTION: The MSR1 rack is not crash-protected. It is recommended that the rack is mounted outside or close to the edge of the working volume of the CMM.

Two mounting options are available for the MSR1: CMM table mounted and wall mounted.

3.6.1 Mounting the MSR1 onto a CMM table

To mount the MSR1 onto your CMM table, carry out the following procedure (see fi gure 10):

1. Place the base over a threaded insert at the desired location on the CMM table and screw down using the M8 or M10 bolt supplied.

2. Screw the leg a few turns into the M10 nut located in the underside of the rack extrusion. Slide the rack along to the centre or other location, as required, and tighten by hand.

3. Push the lower end of the leg fi rmly into the base and rotate the rack to the required orientation. Tighten the grubscrews using the hexagonal key supplied.

Rack

Product installation 31

M10 nut located in extrusion

Leg

Snap ring

Mounting bolt

Base 3 mm AF Allen key

Grubscrews M4 × 4

Figure 10 - Mounting the MSR1 onto a CMM table

32 Product installation

3.6.2 Mounting the MSR1 onto a wall

To mount the MSR1 onto a wall, carry out the following procedure (see fi gure 11):

1. Fix the wall mounting bracket (supplied) in the desired location using the holes or other secure means.

2. Locate the rack on the bracket and secure by engaging the

M10 bolt (supplied) a few turns into the M10 nut located in the underside of the rack extrusion. Slide the rack along until it is centralised or otherwise located as required and tighten the bolt.

Rack

Wall mounting bracket

M10 bolt

Figure 11 - Mounting the MSR1 onto a wall

Product operation 33

4.1 Storing and changing probe modules

!

WARNINGS: The use of eye protection is recommended.

Pinch hazards exist between parts and between moving and static parts. Beware of unexpected movement. You should remain outside the full working envelope of probe head/ extension bar/probe combinations.

It is the machine supplier’s responsibility to ensure that the user is made aware of any hazards involved in operation, including those mentioned in renishaw product documentation, and to ensure that adequate guards and safety interlocks are provided.

Under certain circumstances, the probe signal may falsely indicate a probe seated condition. Do not rely on probe signals to stop the machine.

NOTES: The inhibit switch in the inhibit version of the TP20 body will be automatically actuated by the magnetic fi eld when it approaches the front of the MCR20 probe module changing rack. The minimum distance from the MCR20 probe module changing rack at which the

TP20 is armed will vary with height.

When using long styli fi tted to the EM1 STD or EM2 STD probe modules, do not store them in ports 3 or 4 of the MCR20 or MSR1 rack.

34 Product operation

4.1.1 Calculating the safe clearance position

The recommended safe clearance position is located at the minimum distance from the port centre (at docking height Z) where the probe will be armed, if the probe module is attached.

The safe clearance position for any port (n) can be calculated from:

{Xn, Ys, Z} where Ys = Y – 100 mm

4.1.2 Storing a probe module

To store a probe module, carry out the following procedure (see fi gure 12):

1. Move to the safe clearance position Xn, Ys, Z for the vacant port (n).

2. Move to the docking target co-ordinate for port (n) along the Y axis at the docking height (Z).

3. Move up to the release height Zr, where:

{Zr = Z + 3 mm}

4. Withdraw from the release co-ordinate, maintaining the release height, along the Y axis to a point clear of the port lids where the probe remains inhibited. This point is known as the ‘retract point’

(RP) and has the co-ordinates:

{RP = Xn, Yr, Zr} where Yr = Y – 17.2 mm

Product operation 35

Step 1

Step 2

Step 3 Step 4

Figure 12 - Storing a probe module (typical)

36 Product operation

4.1.3 Picking up a stored probe module

To pick up a stored probe module, carry out the following procedure

(see fi gure 13):

1. Move along the X axis in the direction necessary to arrive at the

RP co-ordinates for the next port required.

2. Move along the Y axis to the release co-ordinates above the centre of port Xn, Y, Zr.

3. Move down to the docking co-ordinates Xn, Y, Z to attach the probe module.

4. Withdraw along the Y axis to the clearance position at co ordinates Xn, Ys, Z.

Step 1

Step 2

Step 3

Step 4

Figure 13 - Storing a probe module (typical)

Product operation 37

4.1.4 Summary of probe module changing procedure

Operation

Safe clearance position for port (n)

Move to docking position

Release probe module

Move to retract point (RP)

Select next port (n)

Enter port

Move to docking position

Move to safe clearance position

Xn

Ys

=

=

X1 to X6 as selected by the user

Y – 100 mm

X axis

Xn

Co-ordinates

Y axis

Ys

Z axis

Z

*

*

Y

*

*

Zr

*

Xn

*

*

*

Yr

*

Y

*

Ys

*

*

*

Z

*

Zr

Yr

=

=

Z + 3 mm

Y – 17.2 mm

* = No change to the previous setting of the axis register

4.1.5 Using the MSR1 module storage rack

The location points for the TP20 probe modules are positioned approximately below the numbered labels on the rack. Accurate positioning is not necessary, as the magnetic force will pull them into the correct position.

The probe modules are held magnetically in the MSR1 and can be rotated if required.

38 Technical data

5 Technical data - TP20 probe module changing touch-trigger probe

NOTE: The following data is derived from high accuracy test rig measurements and may not represent the performance achievable on a CMM. Please consult your CMM supplier for overall system accuracy information.

Performance at 10 mm stylus length

Parameter

LF SF

Unidirectional repeatability*

(2 σ)

2D (XY) form measurement deviation*

0.35

µm

±0.6

µm

0.35

µm

±0.8

µm

Probe module type

MF EF 6-way EM1

STD

0.50

µm

0.65

µm

±1.0

µm

±2.0

µm

0.8

µm

±1.5

µm

0.35

µm

±0.8

µm

EM2

STD

0.35

µm

±0.8

µm

* Measured at a trigger speed of 8 mm/s

Test stylus ball diameter 4 mm

Technical data 39

5.1.1 Probing forces and overtravel limits

Probe module type and stylus length

LF

10 mm

SF

10 mm

MF

25 mm

EF

50 mm

6-way

10 mm

EM1 STD

10 mm

EM2 STD

10 mm

Trigger force

(nominal at stylus tip)

XY Z

0.055 N

(5.5 gf)

0.65 N

(65 gf)

0.08 N

(8 gf)

0.1 N

(10 gf)

0.1 N

(10 gf)

0.14 N

(14 gf)

0.08 N

(8 gf)

0.08 N

(8 gf)

0.75 N

(75 gf)

1.9 N

(190 gf)

3.2 N

(320 gf)

1.6 N

(160 gf)

0.75 N

(75 gf)

0.75 N

(75 gf)

Parameter

Overtravel force (max. at stylus tip) displacement

XY

0.09 N

(9 gf)

+Z

1.15 N

(115 gf)

0.2-0.3 N

(20-30 gf)

3.5 N

(350 gf)

0.2-0.4 N

20-40 gf)

7.0 N

(700 gf)

0.2-0.5 N

(20-50 gf)

0.25 N

(25 gf)

10 N

(1kgf)

2.5 N

(250 gf)

0.2-0.3 N

(20-30 gf)

3.5 N

(350 gf)

0.2-0.3 N

(20-30 gf)

3.5 N

(350 gf)

-Z

-

-

-

-

XY

±14°

±14°

±14°

±14°

9.0 N

(900 gf)

±14°

-

-

±14°

±14°

Overtravel

-Z

-

-

-

-

1.5 mm

-

-

3.7 mm

2.4 mm

4.5 mm

4.0 mm

4.0 mm

+Z

3.1 mm

4.0 mm

* NOTE: The probe module may detach if this value is exceeded.

5.1.2 Probe module changing repeatability

Probe module changing method

Automatic changing

Manual changing

Repeatability

1.0 µm

2.0 µm

40 Technical data

Product compatibility The TP20 is suitable for use with all

Renishaw probe interfaces and probe heads which service the TP1, TP2 and

TP6 touch-trigger probes.

The TP20 is compatible with the PEL,

PK, PAA and PEM series of probe extensions/adaptors.

Dimensions

Diameter 13.2 mm

Length LF/SF/MF/EF

EM1 STD

EM2 STD

6-way

38 mm

88 mm

113 mm

42 mm

Probe mount Thread M8 x 1.25 x 5 mm

Stylus mount Thread M2 x 0.4

Sense directions LF/SF/MF/EF/EM1

STD/EM2 STD

6-way

5-way (±X, ±Y,

+Z)

6-way (±X, ±Y,

±Z)

Probe module pulloff force

10 N (1 kgf) maximum

Sealing IP30

Cable length 50 m with (24 awg) conductors

Probe module life 25,000 changes

Technical data

6 Technical data - MCR20 probe module change rack

41

Dimensions

Length 200 mm

Width 60 mm

Height 145 mm

Port entry velocity Maximum 800 mm/s

Mounting orientation Not designed for horizontal operation with the ports in a vertical orientation

Y axis overtravel Hinged breakout from base

55 mm travel at port height

Z axis overtravel Hinged docking port assembly

90° travel in –Z axis

Inhibit range 100 mm from port centre

42 Technical data

7 Technical data - MSR1 module storage rack

Dimensions

Length 285 mm

Width 86 mm

Height 285 mm

Number of ports 6

Mounting Wall mounted

CMM table mounted

Applications guide 43

8.1 Probe module selection

To obtain the best possible performance from your TP20 probe, it is important to select the correct probe module for your specifi c application. When choosing the probe module to be used, the following considerations should be addressed:

• The mass of the stylus assembly and its centre of gravity. It is always best to use the shortest stylus possible.

• The orientation of the probe body.

• The levels of acceleration and vibration to which the TP20 probe will be subjected. These will vary with each type of CMM and movement velocity.

The following probe modules are available for use with the TP20 probe; each probe module is clearly marked on its front ring and also carries a colour-coded front cap as follows:

• Low force probe module (green cap)

• Standard force probe module (black cap)

• Medium force probe module (grey cap)

• Extended force probe module (brown cap)

• 6-way probe module (blue cap)

• EM1 STD probe module (black cap)

• EM2 STD probe module (black cap)

44 Applications guide

NOTE: It is recommended that a standard force probe module is always used, except where the application or machine acceleration or vibration would cause the TP20 to false trigger.

8.1.1 The low force probe module

The low force probe module, identifi ed by a green cap, is suited to applications that require a low trigger force, for example rubber seals.

8.1.2 The standard force probe modules

The standard force probe modules (SF, EM1 STD and EM2 STD) are identifi ed by black caps and are suited to the majority of applications.

8.1.3 The medium force probe module

The medium force probe module, identifi ed by a grey cap, is provided for use where a higher trigger force than standard is required.

8.1.4 The extended force probe module

The extended force probe module is identifi ed by a brown cap.

Typically, this probe module will only be required with large stylus assemblies, and where spurious triggers caused by machine vibration and acceleration preclude the use of either the standard or medium force probe modules.

8.1.5 The 6-way probe module

The 6-way probe module is identifi ed by a blue cap. This probe module is designed for 6-way operation where there is a requirement to measure in the –Z direction, for example when measuring undercuts.

Applications guide 45

NOTE: Choosing the best stylus for a given application is an important factor in achieving optimum probe performance. For further information on the full range of Renishaw styli, please refer to

Renishaw’s styli and accessories brochure (H 1000-3200) which can be ordered from your supplier or downloaded from Renishaw’s web site, www.renishaw.com.

When selecting a stylus, it is important that the stylus length is kept to the minimum required to access all features to be measured, and that the stylus type offers the maximum possible stiffness. Factors that affect stiffness are:

• Joints in the styli: that tend to reduce rigidity and should therefore be kept to the absolute minimum.

• Stem diameters: that are governed by the ball tip diameter of the stylus.

• Stem material: that can be stainless steel, ceramic or graphite fi bre (GF).

It is also important to ensure that the stylus ball diameter chosen is as large as is practical. This not only ensures that the stylus will be as stiff as possible, but also reduces the stylus’s susceptibility to surface form and surface fi nish.

46 Applications guide

Owing to the modular construction of the TP20, when selecting and using styli the following criteria should be applied:

• Work only within the recommended stylus limits for each probe module (refer to Recommended stylus limits).

• Always use the shortest possible stylus.

• If using larger styli than those recommended for use with each probe module, always conduct trials to establish the effect on measuring performance.

• Minimise the mass of styli by using either ceramic or graphite fi bre (GF) stems.

Applications guide 47

Owing to the modular construction of the TP20 probe, it is recommended that the limits shown in fi gures 14 to 17 are applied when selecting styli to be used.

The low force probe module

The low force probe module has the following recommended stylus limits:

• Steel and carbide styli up to 30 mm long

• No star or cranked styli

Max: 30 mm

Figure 14 - Recommended stylus limits for low force probe module

48 Applications guide

The standard force probe modules

The standard force probe modules (SF, EM1 STD and EM2 STD) can be used with the following range of styli:

• Steel and carbide styli up to 40 mm long.

• Renishaw graphite fi bre (GF) type styli up to 50 mm long.

• Star and cranked styli up to 20 mm offset.

20 mm

Steel: 40 mm

GF: 50 mm

Min: 10 mm

Max: 40 mm

Figure 15 - Recommended stylus limits for standard force probe modules

Applications guide

The medium force and extended force probe modules

The medium force and extended force probe modules have the following recommended stylus limits:

• Any stylus type up to 60 mm long.

• Star and cranked styli up to 20 mm offset.

49

30 mm

60 mm

Min: 10 mm

Max: 40 mm

Figure 16 - Recommended stylus limits for medium and extended force probe modules

50 Applications guide

The 6-way probe module

The recommended stylus limits for the 6-way probe module are:

• Any stylus type up to 30 mm long

• Star and cranked styli up to 10 mm offset

Max: 20 mm

Max: 30 mm

Max: 20 mm

Figure 17 - Recommended stylus limits for 6-way probe module

Applications guide

Comparative stylus lengths

A comparison of the minimum and maximum stylus lengths for use with each probe module is shown in fi gure 18.

LF

51

SF

MF

EF

6W

EM1 STD

EM2 STD

10 mm 50 mm 100 mm

Figure 18 - Comparative stylus lengths

52 Product maintenance

NOTE: Maintenance of the TP20 probe is restricted to the periodic cleaning of the kinematic couplings of both the probe body and the probe module(s). To aid cleaning of these couplings, each TP20 probe is supplied with a Renishaw CK200 cleaning kit.

Each Renishaw CK200 cleaning kit contains a specialised material to effectively remove contamination from the precision ball/V groove seatings, electrical contacts and permanent magnets of the kinematic couplings.

NOTE: When operating the TP20 probe in environments subjected to airborne contamination, the user should determine the frequency of cleaning required to ensure the kinematic couplings remains uncontaminated.

Whilst the kinematic coupling mechanism is highly tolerant of nonmetallic dust, regular inspection and cleaning with the material provided is recommended to ensure continued high performance.

Instructions for use are included with the cleaning kit. If required, replacement kits can be ordered from your supplier (part number

A-1085-0016).

Probe modules that are not attached to the probe body should be stored in the MCR20 or MSR1 rack, or in their transport boxes, to prevent contamination.

Renishaw plc

New Mills, Wotton-under-Edge,

Gloucestershire, GL12 8JR

United Kingdom

T +44 (0)1453 524524

F +44 (0)1453 524901

E [email protected]

www.renishaw.com

For worldwide contact details, please visit our main website at www.renishaw.com/contact

*H-1000-5008-03*