Gage Blocks

[warrjon]

Gauge blocks are calibrated at 20°C. At 23°C the uncertainty of steel blocks would be approx ±1500nm. Stacking blocks increases the uncertainty and potential errors. The guys in the cal lab never stack more than 2 blocks

If I need an accurate block I machine a 20mm diameter round bar in the lathe and check it with a micrometer Zeroed at whatever temperature I am working at.

 

[Janderso]

I watched Mr. Lipton use a set for making up the pressure difference when locking a piece in a set of Kurt jaws.
This way the jaws have an equal pressure bearing side to side.
I hope I am explaining myself well enough.
I would think the cheaper set would be used for this type of application.