Multiple Gages blocks for calibration

K

kmyers

#1
Is it ok to use more than 1 gage block at a time to achieve a desired length when doing a calibration of a height gage. USing 2 6in blocks to for a 12in height gage?:bonk:
 
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J

justncredible

#2
Are you verifying the gage is reading correct, or are you calibrating the gage?

Yes it is okay to stack blocks.

How precise is the hieght gage?
 
K

kmyers

#3
Thanks,

I am calibrating the gage, I haven't begun yet and I don't have any info regarding the gage. I have to contact the manufacturer, I am new to my company and most of the gages were bought at auctions from businessess that went out of business, I am trying to clean it all up roughly 500 gages total, so it is going to be fun.
:thanks:
 

Jen Kirley

Quality and Auditing Expert
Staff member
Admin
#4
Thanks,

I am calibrating the gage, I haven't begun yet and I don't have any info regarding the gage. I have to contact the manufacturer, I am new to my company and most of the gages were bought at auctions from businessess that went out of business, I am trying to clean it all up roughly 500 gages total, so it is going to be fun.
:thanks:
Yes, that sounds like a good time! :notme:

Yes, it's okay to stack gage blocks - just make sure to wring them well. You should be able to pick up the stack by the top block. If they are wrung well, none will drop off, and you can be confident no length error has been introduced.
 
Z

zancky

#5
Yes you can stack blocks but You must first check the stack of the tolerances.
It may happen that stacking blocks you change the Class reference
i.e. if each block is certified +/-0.0003 micronmeter (sorry I not familiar with inches) and you stack 3 of them, you have an error of +/- 0.0009 and depending on your procedure it may not be acceptable
 
D

David DeLong

#6
Yes, that sounds like a good time! :notme:

Yes, it's okay to stack gage blocks - just make sure to wring them well. You should be able to pick up the stack by the top block. If they are wrung well, none will drop off, and you can be confident no length error has been introduced.
I agree with Jennifer about wringing the blocks but I don't know if two (2) six (6) inch blocks would not come apart or drop off. Smaller biocks - absolutely should not separate when held by the largest block in the stack.
 
J

justncredible

#7
Thanks,
I am calibrating the gage, I haven't begun yet and I don't have any info regarding the gage. :thanks:
Post make and model of the gage in question.

Check the cert from the last time the gage blocks were calibrated, they will have a actual measurment, for each block. You use those numbers to come up with the stacks error.

For 500 gages, I would call in a truck service, most big calibration labs have RVs, trucks or vans that can come to the job site and whip thru the entire calibration in a few days. If you are asking about stacking blocks I would really reccomend calling in a service. They can even do gage tracking for you.

You can use a gage block to verify the gage is reading correct, but that is not calibration.
 

Jen Kirley

Quality and Auditing Expert
Staff member
Admin
#8
I agree with Jennifer about wringing the blocks but I don't know if two (2) six (6) inch blocks would not come apart or drop off. Smaller biocks - absolutely should not separate when held by the largest block in the stack.
I've done it many times - if the blocks are lifted straight up vs. held at an angle, they should stay together if wrung properly.

justncredible has brought up a good point. There are cases when contracting a service is a good idea. I would compare the costs, including your time and the things that you can't do while calibrating 500 gages - especially considering some of those gages may also need a quick repair and the service can do that for you in a (hopefully) timely way. I found that sending out gages for repairs was the worst expense and hassle. It doesn't take many of these repairs before the gages' replacement value is exceeded.

The question of whether or not checking a gage's accuracy against gage blocks constitutes calibration has been argued tirelessly already here: Calibration vs. Verification of Calibration vs. Verification - Definitions.
 
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