VERNIER CALIPERS WITH FINE ADJUSTMENT

INSTRUCTION MANUAL Model No. GHB-**
PRECISION MEASURING TOOLS
VERNIER CALIPERS WITH FINE ADJUSTMENT
Thank you for purchasing the Niigata Seiki Vernier Calipers with Fine Adjustment.
This product is a precision measurement tool with a main scale and a vernier scale to indicate the measured value.
● For safe and proper use of this product, please read this instruction manual before use and follow the procedures described.
Please keep manual where it is accessible to user for future reference.
● Keep this manual with the instrument if transferred or leased to a third party.
● For inquiries about this product, please contact dealer or Niigata Seiki at the address listed on the following page.
■PART IDENTIFICATION AND FUNCTION
⑤Measuring surfaces for inside measurements
④Inside Jaws
③Measuring
surfaces for step
measurements
⑦Fine Adjust Lock
⑥Lock Screw
0
10
20
0
30
.10
.20
.30
40
.40
.50
50
.60
.70
60
.80
.90
70
80
90
100
110
120
130
mm
0
0.02mm
⑪Fine Adjust Feed
②Outside Jaws
⑨Depth Bar
⑧Main Scale
⑩Measuring surfaces for
depth measurements
⑫Vernier Slide (Vernier Scale)
①Measuring surfaces for outside measurements
⑦Fine Adjust Lock
Tighten to use Fine Adjustment.
①Measuring Surfaces for
outside measurements
Position measured object
between these surfaces.
②Outside Jaws
Measures external dimensions.
Move Slide to open and close.
⑧Main Scale
Indicates measured value in 1mm graduations.
③Measuring surfaces for
step measurements
Measures the height of steps.
⑨Depth Bar
Bar for measuring depth. Bar moves in and out
with Vernier Slide.
④Inside Jaws
Measures internal dimensions.
Move Slide to open and close.
⑩Measuring surfaces for
depthmeasurements
Depth is measured between these two surfaces.
⑤Measuring surfaces for
inside measurements
Position surfaces inside object
to be measured.
⑪Fine Adjust Feed
Rotate wheel for fine adjustment.
⑥Lock Screw
Locks the Vernier Slide.
⑫Vernier Slide
(Vernier Scale)
Scale for measuring with a resolution of 0.02mm.
Refer to following page for usage instructions.
※ For Fine Adjustment, Loosen Lock Screw ⑥,
and tighten Fine Adjust Lock ⑦. Rotate Fine Adjust Feed wheel ⑪.
SAFETY PRECAUTIONS
To prevent injury to yourself and others, and to prevent damage to
property, always follow the procedures marked with the following
symbols.
WARNING
Please Observe
Denotes a prohibition –
You MUST NOT do
Denotes a requirement –
You MUST do
Indicates risk of personal injury or property damage if not followed.
Read the manual and follow the directions.
・Use of product other than as described in the manual
may cause accident.
Use only for measuring.
・Use for any purpose other than measuring may
damage or wear the instrument. Improper use may
also cause accident.
Use only in suitable environment.
・Do not use in locations that are humid, wet, very hot,
cold, or in direct sunlight.
CALIBRATION
Handle with care.
・Do not drop or subject instrument to excessive shock. Do
not place under heavy objects. Improper handling may
cause damage or poor accuracy.
・Do not scratch instrument, for example by writing ID number.
Jaw tips are sharp̶Handle with care.
・Careless handling may cause injury.
Do not disassemble or modify.
・Do not remove the vernier slide, Please do not attempt to
disassemble or modify as it may cause damage or poor
accuracy.
●In order to maintain instrument accuracy, it is recommended that
accuracy is confirmed through calibration on a periodic basis.
Wear of measuring surfaces from repeated use may affect accuracy and
periodic accuracy checks should be performed.
We provide calibration services.
Please contact agent in country of
purchase to make arrangements.
PREPARATION FOR USE
Before using the caliper, follow the steps below:
●Wipe off rust proofing and dirt from measuring surfaces and slide.
Contamination of surfaces may cause measurement error.
●Allow the caliper and object to be measured time to reach the same temperature.
A temperature difference between the object to be measured and the caliper may cause measurement error. Allow enough time for the
temperatures to equilibrate.
●Performing an accuracy check.
①Jaw Alignment
In closed position, make sure the measuring surfaces on the outside jaws
align properly and there is no gap (no light should leak past.)
0
②Confirm 0 points on scale (see diagram at right)
With jaws closed as in step ① above, make sure the reading is zero and the vernier scale graduations align at the 0 and 49 positions as shown.
0
10
.10
.20
20
.30
.40
The measured value is determined by reading the main scale,
and then adding the Vernier Scale reading determined by the
position where the vernier and main scale graduations align.
Measured Value = Main Scale Reading + Vernier Scale Reading
●EXAMPLE 1
70
Main Scale
(1mm)
Vernier Scale
(0.02mm)
Measured Value: 77.00mm
80
0
.10
●EXAMPLE 2
70
Main Scale
(1mm)
Vernier Scale
(0.02mm)
.20
80
0
70
.10
90
.20
.40
.50
110
.60
.70
120
.80
.90
Reading
77
+ 0 .0 0
7 7 .0 0
0
.30
100
.40
.50
110
.60
.70
120
.80
.90
0
.10
90
.20
.30
100
.40
.50
110
.60
.70
120
.80
.90
0
.60
.70
.80
.90
0
Check alignment
PREVENTING ERRORS
In order to prevent measurement error, please note the following.
POSITIONING CALIPER ON OBJECT
<Flat surfaces>
Position the caliper
perpendicular to the
surfaces to be measured.
Jaw
<Cylindrical surfaces>
Position the caliper
perpendicular to the axis
of the cylinder.
Measured
Object
VIEWING THE SCALE
Reading
77
+ 0 .3 0
7 7 .3 0
Measured Value: 77.36mm
80
0
.30
100
Measured Value: 77.30mm
●EXAMPLE 3
Main Scale
(1mm)
Vernier Scale
(0.02mm)
90
.50
50
40
0.02mm
③Depth Confirmation
Position caliper on a flat surface for depth measurement. Reading should
be 0 as in step ② above, with the vernier scale graduations aligned at the
0 and 49 positions.
READING THE SCALE
30
Reading
77
+ 0 .3 6
7 7 .3 6
AFTER USE CARE ・ STORAGE NOTES
●Wipe slide, measuring surfaces, and exterior with a
dry cloth to remove any dirt or oil.
When not in use, apply anti-corrosive treatment or keep in
anti-corrosive bag.
Scale should be read from
directly above the calipers.
Due to step in height of vernier
scale relative to main scale,
if viewing direction is not directly
above the reading may have
parallax error.
SPECIFICATIONS
●Material:Stainless Steel (Satin finish)
Model No.
Measuring Range
Resolution
Accuracy
GHB-15
GHB-20
GHB-30
0∼130mm
0∼180mm
0∼280mm
0.02mm
±0.05mm
±0.08mm
●When not in use, keep jaws slightly open.
If stored with jaws closed, thermal expansion may create
excessive forces and affect accuracy.
●Store in supplied case in a cool, dry location.
Store away from moisture or direct sunlight, and out of reach
of unauthorized personnel.
Niigata seiki Co., Ltd.
6-15-22, Tsukanome, Sanjo, Niigata, Japan, 955-0055
Tel. : +81-256-31-5670 Fax. : +81-256-39-7730
MAIL intl.sales@niigataseiki.co.jp
URL http://www.niigataseiki.co.jp
I302-K 1606
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