+ / - .003MM tolerance 1

What material(s) and what type of feature(s) and size(s)are being measured?

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"It's the questions that drive us"
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The material is 1214L, and it is a 3MM bore approx. 22MM in length.

Usually when one has a small tolerance such as calibration of gauge blocks, the parts are checked at 20 degrees cellius otherwise measuring them in the winter versus the summer will change the values.

The drawing should have stated this otherwise you have room for discussion with your customer.

In one situation that I know, the screw machine producer could heat up the part by rubbing it back and forth in your hand and the size would increase.

Get clarification from your customer and their drawing should reflect it.

Dave D.

Talk with your customer on the method of measurement at his facility and have an understanding if the customer is measuring in controlled conditions and what type of gaging is he using. Typically you would use an air gage with the proper class setting ring to set the gage and measure at 20 degrees C. This is assuming this is a through hole.

Another thought on this subject - if you are measuring the parts "hot", then you may want to have an in-process nominimal dimension and tolerance so that the parts will comply with the customer requirement when they are at room temperature of 20 degrees celsius.

Dave D.