Leadscrew error compensation. Fagor CNC 8055 para otras aplicaciones, CNC 8055 for lathes, CNC 8055 para fresadoras, CNC 8055 for milling machines, CNC 8055 para tornos, CNC 8055 for other applications

7.

Installation manual

7.5.7

Leadscrew error compensation

The CNC provides a table for each one of the axes requiring leadscrew compensation. It is possible to define different compensation values for each moving direction. This type of compensation is activated by setting a.m.p. LSCRWCOM (P15)=ON for the desired axis.

The CNC enables one leadscrew error compensation table for each axis. The number of elements of the table is determined by the a.m.p. NPOINTS (P16), being possible to define up to 1000 points per axis.

CNC 8055

CNC 8055i

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OFT

: V01.6

X

Each parameter of the table represents a point of the profile to compensate. The following information is defined at each point:

• The position occupied by the point in the profile (position to compensate). It is defined by its coordinate referred to machine zero. Possible values ±99999.9999 mm or ±3937.00787 inches.

• The amount of error of the axis in this point in the positive direction. Possible values ±99999.9999

mm or ±3937.00787 inches.

• The amount of error of the axis in this point in the negative direction. Possible values

±99999.9999 mm or ±3937.00787 inches.

For each axis position, define the amount of error to be compensated in both directions. If the amount of error in the negative direction is zero in all points, it assumes that the amount of error defined for the positive direction is valid for both directions.

Leadscrew error compensation on rotary axes

On rotary axes, although the display is limited between 0 and 360º, the internal count is accumulative. When using leadscrew error compensation, set positions 0° and 360°, first and last point of the table, with the same amount of error. This way, the CNC will apply the same compensation in all the revolutions.

Otherwise, the compensation will be limited to the indicated field.

Considerations and limitations

When defining the profile points in the table, the following requirements must be met:

• The axis points must be in sequential order starting from the most negative (least positive) point to be compensated.

• For those points outside the compensation zone, the CNC will apply the compensation value corresponding to the table point closest to them.

• The amount of error of the machine reference point may have any value.

• The error difference between two consecutive points must not be greater than the distance between them (maximum slope= 100%).

Setting example

The X axis leadscrew must be compensated in the positive direction for between X-20 and X160 according to the leadscrew error graph below:

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Installation manual

Set a.m.p. LSCRWCOM (P15) = ON and NPOINTS (P16) = 7

Considering that the Machine Reference Point (physical location of the marker pulse) is located 30 mm from HOME (machine reference zero), at X30. The leadscrew error compensation parameters must be set as follows:

Point

P001

P002

P003

P004

P005

P006

P007

Position

X

X

X

X

X

X

X

-20.000

0.000

30.000

60.000

90.000

130.000

160.000

Positive error

EX

EX

EX

EX

EX

EX

EX

0.001

-0.001

0.000

0.002

0.001

-0.002

-0.003

Negative error

EX

EX

EX

EX

EX

EX

EX

0

0

0

0

0

0

0

7.

CNC 8055

CNC 8055i

S

OFT

: V01.6

X

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