DIGITAL BORE GAUGEINSTRUCTION MANUAL
Model No. : CDI-50D / CDI-100D / CDI-160D<combined>

Thank you for purchasing the Digital Bore Gauge.
Please read this manual thoroughly before use for proper operation.

■PART IDENTIFICATION■SPECIFICATIONS＊：With supplied Digital Indicator.

LCD Display

Model No.
Measurement Range (mm)(mm)
Resolution※＊
Wide Range Accuracy (µm)※＊
Adjacent Error (µm)※＊
Repeat Accuracy (µm)
Single Probe Measuring Range (mm)CDI-160D
CDI-100D
CDI-50D
50-16050-100
35-50
0.002
0.002
0.002
1818156653331.6
1.6
1.2
0.5, 1, 2, 3 mm (One piece each size)
450
450
400

Digital Indicator※2ABS/SETmm
MIN

ZERO/ONCAL[MIN] Button[ZERO/ON]Button

Clamp
Screw

Extension Washer(g)Weight[CAL] ButtonSpacerProtective Cover

Grip

ACCESSORIES● Extension Rods
CDI-50D ........ 35, 40, 45, 50mm (4 pieces)
CDI-100D ..... 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 mm (11 pieces)
CDI-160D ..... 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105 mm (12 pieces)● Sub Rod ........ 55 mm (CDI-160D only)● Battery ........... CR2032 Lithium Battery (Included for testing)

0.5mm 1mm 2mm 3mm

Length below grip-150mm

Extension Washer

Shaft

Rod Mounting
NutExtension
Rod● This is a precision instrument, use care not to dropor mishandle.

55mm Sub Rod(CDI-160D only)※1: This button not used.
※2: “0.01” Indicates bar graphdisplay units. Bar graph display
will increase or decrease by one
bar for each 0.01mm change inmeasured value.

Probe Tip
Measurement
Head■BATTERY REPLACEMENTNOTICE

Extension RodGuide■ASSEMBLY● Please do not disassemble or modify.
● Keep instrument away from water and oil.
● Use only with supplied Extension Rods and Washers.
● Keep instrument away from direct sunlight and hightemperatures such as in a car, near a stove or heatsource.
● After use, remove dust and cutting chips and apply
rust preventative oil to components including
Extension Rods, and Extension Washers. When
not in use store in original case.
● This product is for measuring inside diameter; use
only as directed. Improper use may cause accident
or injury.
● Avoid using in locations with high electric fields,such as near fluorescent lights or switching power
supplies, as it may cause erroneous reading todisplay on LCD.

①Remove the protective cover by unscrewing
the two screws which hold the cover in place.
※To reattach the protective cover, please refer tothe section: “Attaching the Protective Cover”

MIN

ZERO/ONCALInsert②Loosen the Clamp Screw and insert theDigital Indicator into the gauge body.
Tighten Clamp Screw to secure.

※After attaching to body, press the [ZERO/ON]
Button to turn on power. Check for proper
operation by pressing on the Probe Tip. If theLCD display reading does not change, readjust
the insertion depth of the indicator.

ABS/SETmmClamp
Screw③Chose combination of Rod, Washer, and Sub Rod (CDI-160D only)
applicable for desired measurement range.
Remove the Rod Mounting Nut and install the selected Rod, Washer
and Sub Rod, then replace Mounting Nut to secure to body.
※When selecting washers, combination with fewest washers is preferred.
Example: For 60mm Measurement
Rod Mounting Nut

Open battery door using the tabs
on either side. Insert battery with“+” side facing downward. Push indoor to replace.
Battery(CR2032)

Battery
Door

CautionOnly use CR2032 Lithium Battery.

Attaching the Protective CoverWhen using the Protective Cover, please attach using
the following procedure.
①Loosen the Clamp Screw and remove Clamp andSpacer from shaft. (Figure: 1)②Without removing the Rod or Washers, follow the“Assembly” procedure to reattach the Indicator andClamp without the Spacer.
③Mount the Protective Cover to the Indicator and attachwith the 2 mounting screws. (Figure: 2)
Clamp
Screw
SpacerAttach※1

RemoveABSScrews Indicator

Remove[ABS/SET]
Button※ Not including quantization error (±1 count)

Extension Rod: 60mm

Example: For 62.5mm Measurement(Figure: 1)
Extension
Extension
Extension
Rod: 60mm ＋ Washer: 2mm＋ Washer: 0.5mm

Example: For 118mm Measurement

Extension
Sub Rod:
Extension
Rod: 60mm ＋ Washer: 3mm ＋ 55mm

(Figure: 2)

Protective
Cover■MEASUREMENT
For accurate measurements, please follow the procedure below.
①In cross section perpendicular to the axis of the bore, position the gauge along diameter ⓐ. (Figure: 1)
This is the maximum distance, and at this point the Indicator will read the maximum value.
The Guide will automatically position the Measurement Head along diameter ⓐ.
②In cross section parallel to the axis of the bore through diameter ⓐ, position the indicator to minimize the distance ⓑ. (Figure: 2)
In this position the Indicator will read the minimum value. This position must be manually achieved by pivoting the gauge and noting
the point where the Indicator shows the minimum value. (Figure: 3)ａｂ
ABS/SETABSMINCALZERO/ON(Figure: 1)(Figure: 2)(Figure: 3)■OPERATION①Before use, please make sure the Measurement Head components are securely tightened. Tighten as necessary.

②Clean the gauge head and the ID of a Ring Gauge Standard using parts cleaner or cleaning solution.
③Press the [ ZERO/ON ] Button to turn on power. ※Power is turned off with a long press to the [ ZERO/ON ] Button.

ABSOLUTE MODE (ABS)①Turn on power. If the “”, “※Displays absolute measurement of workpiece.

” symbols are displayed on the LCD, press the [MIN] Button to turn off.

②Make the “SET” value of the Bore Gauge match the ID of the Ring Gauge Standard. Press and hold the [ABS/SET] Button until“SET” blinks on the display.
③Continue holding the [ABS/SET] Button and the display character to the left will blink. Use a short press of the [ABS/SET] Button tochange the value, and a long press to change the character being modified.
Repeat this process to enter the dimension of the Ring Gauge Standard on the LCD display. (Figure: 4)④When the value is entered, the flashing position will return to “SET”.
A short press of the [ABS/SET] Button to turn off the flashing.

⑤Insert the Measurement Head into the Ring Gauge Standard andpress the [MIN] Button to put the Indicator into minimum-mode. Slowly
pivot the gauge (Figure: 3) to display the minimum value.
⑥Remove the gauge from the Ring Gauge and press the [CAL] Button
until “OK” is momentarily displayed.
Preparation for measurement is now complete.

ABS

ABS/SETMIN

ZERO/ONCAL⑦Put the gauge into the workpiece to be measured, and pivot the gauge
slowly. (Figure: 3) The LCD will display the measured value. (Figure: 5)※Press the [ON/ZERO] Button momentarily to reset display inpreparation to measure the next workpiece.

COMPARATIVE MEASUREMENT※Display difference between workpiece andreference standard.

①Turn on power. If “”, or “” symbols are displayed on the LCD,
press the [MIN] Button to turn off. If “ABS” is displayed press the [ABS]
Button to turn off.

(Figure: 4)

ABS

ABS/SETMIN

ZERO/ON

Workpiece
Workpiece Dimension(Figure: 5)

ZERO/ON

Workpiece
Difference between
Workpiece andReference Standard (Figure: 6)

CAL②Insert the Measuring Head into the Ring Gauge Standard and press[MIN] Button to put the Indicator into minimum-mode. Slowly pivot thegauge (Figure: 3) to display the minimum value.
③Remove the gauge from the Ring Gauge and press the [CAL] Button
until “OK” is momentarily displayed.
Preparation for measurement is now complete.

④Put the gauge into the workpiece to be measured, and pivot the gauge
slowly. (Figure: 3) The LCD will display the difference between themeasured workpiece and the reference standard. (Figure: 6)※Press the [ON/ZERO] Button momentarily to reset display inpreparation to measure the next workpiece.

ABS/SETMINCAL■TROUBLESHOOTINGERROR CONDITION

CORRECTIVE ACTION● LCD does not display● Cycle power by removing and● Display is not clear

replacing battery.
● Replace battery with new one.

● Displayed value is unstable

Ring Gauge
Adjust Reading Standard※If problem persists, or if you have any questions,please contact distributor or place of purchase.
※Please note, manufacturer is unable to respondto inquires or provide service directly. Pleasecontact distributor or place of purchase.

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

I242-K 1506