Standard regarding the wear of Thread and Plug Gages.

[ferkoattila]

HELLO,

I need very quick help..

Is there a standard regarding the wear of buffer sizes and threaded calibers?

[Marc]

What do you mean by Buffer Sizes?

[Jim Wynne]

In Reply to Parent Post by ferkoattila

HELLO,

I need very quick help..

Is there a standard regarding the wear of buffer sizes and threaded calibers?

In Reply to Parent Post by Marc

What do you mean by Buffer Sizes?

And threaded calipers?

[ferkoattila]

Buffer size is the gray and the threaded is the green in the image below.

[bbarbee]

The "threaded calipers" would bre referred to as a thread plug gauge, and the buffers would be called a plug or pin gauge. Either one can be checked with a suffucuently accurate micrometer or CMM. They should go on a calibration schedule like anything else. Their wear rate will depend on how and how often they are used. As to how much wear is too much, the thread plug gauges will have a standard (2B is a common one I remember from automotive for something like what you have pictured, but you can look it up) and the pin gauges will depend entirely on what the tolerance of the part being evaluated is.

[ferkoattila]

In Reply to Parent Post by bbarbee

The "threaded calipers" would bre referred to as a thread plug gauge, and the buffers would be called a plug or pin gauge. Either one can be checked with a suffucuently accurate micrometer or CMM. They should go on a calibration schedule like anything else. Their wear rate will depend on how and how often they are used. As to how much wear is too much, the thread plug gauges will have a standard (2B is a common one I remember from automotive for something like what you have pictured, but you can look it up) and the pin gauges will depend entirely on what the tolerance of the part being evaluated is.

So ther is no standard for the pin or plug gauge reflective to the wear of the gauge?????

[Jim Wynne]

In Reply to Parent Post by ferkoattila

So ther is no standard for the pin or plug gauge reflective to the wear of the gauge?????

If pin gages are worn to the point where their precision is no longer acceptable in the application, they should be replaced. The practical tolerance limits for pin gages are dependent on application so there is no general standard.

[ferkoattila]

Hello all,

Another question regarding for the calibration for pin gauges.
If i order a pin gauge and i recive calib. certificate, after is expire the certificate,
then I just make regular checks on them, and are not certified, it may be that the ISO 9001 auditor to disagree and ask my certificate, or is ok if I just record and regularly check whidout certificate. (definatly the gauges are used in production).