Is there a standard that I should use when performing calibration on mic's and calipers? refering to different size blocks for 0-1" instruments. Can I use 5 different blocks and be done with it?

Is there a standard that I should use when performing calibration on mic's and calipers? refering to different size blocks for 0-1" instruments. Can I use 5 different blocks and be done with it?

There is always a standard.:D Seriously, it depends on your industry and your requirements.

If you have five calibrated blocks across the range of use, I would think you would be OK. Be sure the blocks are the appropriate grade, are stored properly, etc. Keep in mind if you are using five blocks a whole lot, you need to watch for wear/error in the gauge blocks.

Also, not sure if parallelism/flatness is an issue for your instruments.

Brad is right--requirements will be based on what accuracy and resolution is being asked of your inspection processes.

I have found a site for you: Long Island Indicator Service (http://longislandindicator.com/p7.html). This is a very informative site. Use the links for more details. I am not affiliated with the company.

There are definitely standards to use for these. Check ASME (www.asme.org) or GIDEP (www.gidep.org if you do business with the government).

For example, Micrometers would be ASME B89.1.13-2001.


In general picking a few blocks works fine. Consider the following:

Micrometers:
Flatness and Parallelism are important if you are using only part of the anvil to make the measurment. If you are using the entire surface of the micrometer, these factors won't really matter.

Pick blocks to check each part of the rotation on the gage. The standard above says to use: 0, .21, .42, .605, 0.815, 1".


Calipers:
If they are mechanical, you want to check a couple of points again to check the dial like: 0.35, .065, .8". If Digital, skip these.

Then check 25, 50, 75, 100% Full Scale.

For ID and Depth, check 1 inch. No other points are needed since they were all checked in the OD tests.

Thanks was given people!
I knew there was a standard...just having a brain freeze as to where to find the info!

Thanks again:cool:

Is there a standard that I should use when performing calibration on mic's and calipers? refering to different size blocks for 0-1" instruments. Can I use 5 different blocks and be done with it?

Fletch, by any chance, do you also use an optical flat to check the micrometers?

Mil-std-45662a , Ansi/ncsl Z540-1 And Iso 9001

And don't forget to do a before and after calibration reading, and record both readings. You know...., in case you find an out of calibration tool, and need to identify and segrate all parts accepted with the tool.

Mil-std-45662a , Ansi/ncsl Z540-1 And Iso 9001

These are calibration system standards not methods for calibration of M&MT.

Mil-STD-120, though old, is still a good bet for most measurement instruments and is usually free from the DOD via a website.