User Manual

Model No.

GVC-15KDS

Precision Measurement Tools

KAIDAN (Ziggurat) VERNIER CALIPERS
Thank you for purchasing the KAIDAN (Ziggurat) VERNIER CALIPERS.
This product is a precision measurement tool with a main scale and vernier scale graduations 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 Description⑤Measuring surfaces for internal measurements③Measuring surfaces forstep measurements⑦Scale⑥Lock Screw④Inside Jaws

⑧Depth Bar
mm01020304050607080

9000.05mm⑩Thumb Knob
②Outside Jaws

⑪Vernier Slide (Vernier Scale)⑨Measuring surfaces for
depth measurements①Measuring Surface
For Outside Measurements① Measuring Surface For Outside Measurements … Object to be measured is positioned between these surfaces.
② Outside Jaws ………………………………………… Measures extremal dimensions. Slide vernier to open and close.
③ Measuring surfaces for step measurements ……… Measures the height of steps.
④ Inside Jaws …………………………………………… Measures internal dimensions. Slide vernier to open and close.
⑤ Measuring surfaces for internal measurements … Position surfaces inside object to be measured.
⑥ Lock Screw …………………………………………… Locks the vernier slide in place.
⑦ Scale ………………………………………………… Indicates measured value in 1mm graduations.
⑧ Depth Bar …………………………………………… Bar for measuring depth. Bar moves in and out with vernier slide.
⑨ Measuring surfaces for depth measurements …… Depth is measured between these two surfaces.
⑩ Thumb Knob ………………………………………… Position thumb on knob to move vernier slide with accurate control.
⑪ Vernier Slide (Vernier Scale) ……………………… Scale for measuring with a resolution of 0.05mm.
Refer to following page for instructions on use.

Safety Precautions

Please Observe

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

Denotes a PROHIBITIONYou MUST NOT do

Denotes a REQUIREMENTYou MUST do

Caution Indicates risk of personal injury or property damage if not followed.
Read the instruction manual and follow theinstructions.

・Use of product other than as described in the manual
may cause accident.

Use only for measuring.

Use in proper environment.

・Please do not use instrument in rain or locations withexcessive humidity. Do not use at extreme high or lowtemperatures. Keep out of direct sunlight.

Jaw tips are sharp -- Handle with care.

・Use for any purpose other than measuring may damage
or wear the instrument. Improper use may also causeaccident.

・Careless handling may cause injury.

Handle with care.

・Excessive force to vernier slide will cause damage or
cause poor accuracy.

・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.

When lock screw is tightened, do not attempt tomove the vernier slide.

Do not disassemble or modify.

・Do not remove the vernier slide, Please do not attempt todisassemble or modify as it may cause damage or poor
accuracy.

PREPARATION FOR USE
Before using the caliper, please perform the following:●Loosen the lock screw.

Moving the vernier slide with the lock screw tightened may cause unnecessary force to the slide which will damage the caliper andaffect accuracy.

●Wipe off any corrosion, 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.

●How to perform 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 (ref. diagram at right)
With jaws closed as in step ① above, make sure the reading is zero andthe verier scale graduations align at the “0” and “39” positions as shown.

010203040③Depth 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.

50607080

9000.05mm

Proper alignment

READING THE SCALEPREVENTING ERRORSThe measured value is determined by reading the main scale,and then adding the vernier scale reading as determined by theposition where the vernier and main scale graduations align.

In order to prevent measurement error, please note the following.

Measured value = Main Scale Reading + Vernier Scale Reading

Measured Value: 77.00mm●EXAMPLE 1
Main Scale(1mm)

Vernier Scale(0.05mm)010203040506070809000.05mm

Reading
７７＋ ０．００７ ７．００

HOW TO POSITION CALIPER ON OBJECT FOR MEASUREMENT
Flat surfaces -When measuring featureswith flat surfaces, makesure the measuring surface
mm of the jaws are parallel to thesurfaces to be measured.

Measured Value: 77.30mm●EXAMPLE 2mm
Main Scale(1mm)

Vernier Scale(0.05mm)010203040506070809000.05mm

Measured Value: 77.35mm●EXAMPLE 3
Main Scale(1mm)

Vernier Scale(0.05mm)0Reading
７７＋ ０．３０
７ ７．３０1020304050607080

9000.05mm

Reading
７７＋ ０．３５
７ ７．３５

Cylindrical surfaces -When measuring cylindricalfeatures, make sure thecaliper jaws areperpendicular to the cylinder
axis as shown.

Jaw

Object being measured

VIEWING THE SCALE
Scale should be read fromdirectly above the calipers.
Due to step in height ofvernier scale relative tomain scale, if viewingmmdirection is not directly
above the reading may haveparallax error.

AFTER USE CARE, STORAGE NOTESPRODUCT SPECIFICATIONS●As required, wipe slide and measuring surfaces with a dry
cloth treated with anti-corrosive oil.
When not in use, apply anti-corrosive treatment or keep inanti-corrosive bag.

●Material : Stainless Steel●Measuring Range : 0 〜150 mm●Resolution : 0.05 mm●Accuracy : ± 0.05 mm●When not in use, keep jaws slightly open and lock screw
slightly loose to prevent over tightening due to thermal
expansion which may affect accuracy.
●Store in supplied case when not in use in a cool, dry location.
●Wear of measuring surfaces from repeated use may affectaccuracy. We recommend that instrument accuracy is
confirmed through calibration on a periodic cycle.

Niigata seiki Co., Ltd.
6-15-22, Tsukanome, Sanjo, Niigata, Japan, 955-0055
Tel. : +81-256-31-5660 Fax. : +81-256-39-7730

MAIL intl.sales@niigataseiki.co.jp
URL http://www.niigataseiki.co.jp
I223-K1411