User Manual

Model No. GVC-＊＊KDE

PRECISION MEASURING TOOLSVERNIER CALIPERS (Kaidan Scale)Thank you for purchasing the Vernier Calipers (Kaidan Scale).
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※Model GVC-15KDE shown.

⑤Measuring surfaces for internal measurements⑥Lock Screw④Inside Jaws
③Measuringsurfaces for stepmeasurements

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⑦Main Scale

 PPPP⑩Thumb Knob
②Outside Jaws

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⑧Depth Bar⑪Vernier Slide (Vernier Scale)⑨Measuring surfaces for
depth measurements①Measuring surfaces foroutside measurements①Measuring Surfaces for outside measurements … Object to be measured is positioned between these surfaces.
②Outside Jaws ………………………………………… Measures external dimensions. Move Slide to open and close.
③Measuring surfaces for step measurements……… Measures the height of steps.
④Inside Jaws…………………………………………… Measures internal dimensions. Move Slide to open and close.
⑤Measuring surfaces for internal measurements … Position surfaces inside object to be measured.
⑥Lock Screw…………………………………………… Locks the Vernier Slide position.
⑦Main Scale …………………………………………… Indicates measured value in 1mm graduations.
⑧Depth Bar …………………………………………… Bar for measuring depth. Bar moves in and out with Vernier Slide.
⑨Measuring surfaces for depth measurements …… Depth is measured between these two surfaces.
⑩Thumb Knob ………………………………………… Position thumb on knob for precise control of vernier slide.
⑪Vernier Slide (Vernier Scale) ……………………… Scale for measuring with a resolution of 0.05mm.
Refer to following page for usage instructions.

SAFETY PRECAUTIONS
Always follow the proper operating procedures in order to prevent
harm to yourself or others, and to prevent damage to property.

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 instructions.
・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.
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 IDnumber.

Use In Proper Environment
・Please do not use instrument in rain or locations withexcessive humidity. Do not use at extreme high or low
temperatures. Keep out of direct sunlight.
Jaw Tips Are Sharp – Handle With Care.
・Careless handling may cause injury.
Do not move the Vernier Slide when the Lock Screwis tightened.
・Excessive force applied to Slide may cause damage oraffect accuracy.
Do not disassemble or modify.
・Do not remove the vernier slide, Please do not attempt
to disassemble or modify as it may cause damage orpoor accuracy.

CALIBRATION●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 ofpurchase to make arrangements.

PREPARATION FOR USE
Before using the caliper, follow the steps below:●Loosen the lock screw.

Moving the vernier slide with the lock screw tightened may cause excessive force to the slide which will damage the caliper and affectaccuracy.

●Wipe off any dirt, or oil 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 thetemperatures 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.)

②Confirm “0” points on scale (see diagram at right)
With jaws closed as in step ① above, make sure the reading is zero andthe vernier scale graduations align at the “0” and “39” positions as shown.

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③Depth Confirmation
Position caliper on a flat surface for depth measurement. Reading shouldbe “0” as in step ② above, with the verier graduations aligned at the “0”and “39” positions.

READING THE SCALE
The measured value is determined by reading the main scale,and then adding the Vernier Scale reading as determined bythe position where the vernier and main scale graduations align.

Measured value = Main Scale Reading + Vernier Scale Reading●EXAMPLE 1 Measured Value: 77.00mm
Main Scale（1㎜）
Vernier Scale（0.05㎜）

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PPReading
77＋ 0. 00
77. 00●EXAMPLE 2 Measured Value: 77.30mm
Main Scale（1㎜）Vernier Scale（0.05㎜）

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PPPPProper alignment

PREVENTING ERRORSIn order to prevent measurement error, please note the following.

POSITIONING CALIPER ON OBJECT＜Flat surfaces＞
When measuring featureswith flat surfaces, make surethe measuring surface of thejaws are parallel to thesurfaces to be measured.

Jaw＜Cylindrical surfaces＞
When measuring cylindricalfeatures, make sure the caliper
jaws are perpendicular to thecylinder axis as shown.

Workpiece

VIEWING THE SCALE
Reading
77＋ 0. 30
77. 30●EXAMPLE 3 Measured Value: 77.35mm
Main Scale（1㎜）
Vernier Scale（0.05㎜）

Reading
77＋ 0. 35
77. 35

Scale should be read fromdirectly above the calipers.
Due to step in height of vernierscale relative to main scale, if
viewing direction is not directly
above the reading may haveparallax error.

SPECIFICATIONS●Material : Stainless Steel

AFTER USE CARE, STORAGE NOTES●Wipe slide, measuring surfaces, and exterior with a dry
cloth treated with anti-corrosive oil. When not in use,apply anti-corrosive treatment or keep in anti-corrosivebag.
●When not in use, keep jaws slightly open and lockscrew slightly loose to prevent over tightening due tothermal expansion which may affect accuracy.

●Store in supplied case in a cool, dry location. Keepaway from direct sunlight or wet locations and protectfrom use by unauthorized personnel.

Model No.
Measuring Range
Resolution
Maximum
permissible error
Weight

GVC-15KDE GVC-20KDE GVC-30KDE
150mm

200mm

300mm

0.05mm±0.05mm
140g

200g±0.08mm380g

I442-K2205