How to Calibrate a Vernier Caliper - Detailed Procedure

Wes Bucey

Quite Involved in Discussions
#11
Re: How to Calibrate a Vernier Caliper - Seeking Detailed procedure

@Wes Bucey, nice idea, thats quite easy,
To add more to check for the internal jaws,
what I have seen outside calibrated vendors use are master 1.000" Ring gages to check the inside of the jaws, and you check it @ 2 spots of the ring.
You can also further check the inside @ a bigger size ring 3 -4" size ring, whichever you can find.
Suman
Rings are inaccurate. The whole point of this device is that the "gage blocks" are firmly embedded in the device at preset distances for calibrating inside measurements.
 
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P

pangchiaboon

#12
Re: How to Calibrate a Vernier Caliper - Seeking Detailed procedure

Hi Abdallah, for vernier caliper i think is more appropriate if we use the term "verification" instead of "calibration".
 
J

JaneB

#13
Re: How to Calibrate a Vernier Caliper - Seeking Detailed procedure

FWIW:
There is a device called by many manufacturers a "caliper checker"

Using one is a lot quicker than the method I learned using individual gage blocks.

Here's a picture of one in this post
http://elsmar.com/Forums/showpost.php?p=384235&postcount=6
Can you get them for larger calipers? I have a client who does a lot of big work on one-off jobs and is wrestling with how best to do the calibration thing...
 
D

Don Jones

#15
Re: How to Calibrate a Vernier Caliper - Seeking Detailed procedure

According to ISO 9001/TS 16949 I have to calibrate my Vernier back to a National Standard. As I am from the UK, shall I use BS 887:2008 or would it be more beneficial to purchase BS EN ISO 13385-1:2011?

Does anyone know what the differences are to these 2 Standards?
 

Jim Wynne

Staff member
Admin
#16
Re: How to Calibrate a Vernier Caliper - Seeking Detailed procedure

According to ISO 9001/TS 16949 I have to calibrate my Vernier back to a National Standard. As I am from the UK, shall I use BS 887:2008 or would it be more beneficial to purchase BS EN ISO 13385-1:2011?

Does anyone know what the differences are to these 2 Standards?
Welcome to the Cove. :bigwave:

"Measurement standards" with regard to calibration requirements refers to the physical standards--such as gage blocks--used to calibrate the device, not to written standards. The idea is that the calibration of the measurement standards must be traceable to national or international standards--an unbroken chain of calibrations back to the source.
 

Mikishots

Trusted Information Resource
#17
Re: How to Calibrate a Vernier Caliper - Seeking Detailed procedure

Clean jaws and track of dirt, grease and foreign matter. Verify that gear moves across tracks freely. Bring jaws together and note reading (dial should be reading zero, also if dial is not reading zero, move the dial face to zero set and continue with checks).

On the #1 check (OD jaws) insert a .500-inch (12.7 mm) gauge block between the jaws of the caliper and close so both jaws are touching the gauge block. Record reading.

Repeat steps with a 1-inch (25.4 mm) gauge block and 4-inch (101.6 mm) gauge block. Record reading.

Repeat using appropriate size micrometer standard (150, 200 or 300).

On the #2 check (ID Jaws) set the calipers on 12.7mm and lock into place and measure the jaw width with another pair of calipers that have been calibrated (caliper number must be recorded for traceability). Record reading.

Repeat step for 25.4 mm and 101.6 mm and appropriate length of caliper (150, 200 or 300). Record readings.

On the #3 check (height check) set 12.7 mm gauge block on surface plate, extend the caliper above the block and bring down to touch the block. Record reading.

Repeat step for 25.4 and 101.6mm gauge blocks. Place appropriate size micrometer standard on surface plate and extend the caliper above it and bring the caliper down to touch. Record readings.

Maintain readings on file in the Quality Department.
I would suspect that any procedure stated to be detailed would include a check of the measuring surfaces for nicks, gouges, scratches - for calipers, I've never come across one that didn't require this.
 
D

Don Jones

#18
Re: How to Calibrate a Vernier Caliper - Seeking Detailed procedure

Thanks all! That's good info! One last requirement; what's the criteria for the squareness and parallelism of a 150mm with ext/int jaws and depth rod??

....sorry; flatness as well!!




.
 
Last edited by a moderator:
C

calroom

#19
Re: How to Calibrate a Vernier Caliper - Seeking Detailed procedure

Hi,

Newbie here.

Just want to check if using BS EN ISO 13385-2:2011 as a GUIDE,
Which test method should I choose?

Appreciate if someone can help.

Thanks.
 
Last edited by a moderator:
L

louc74

#20
Re: How to Calibrate a Vernier Caliper - Seeking Detailed procedure

What grade gauge block would you use? I have just taken over calibration for my new employer and found they have been using economy grade blocks. I have to buy new ones and my old employer owned Ceramic 00 grade. Will grade 0 work?
 
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