I'm designing a fixture to elevate the qualification sphere on our CMM table by 6". The fixture does not need to repeat position with high accuracy, but it does need to be dimensionally stable during the probe qualification routine (up to about 6 hours). The temperature in the lab may vary within a range of about 5 degrees F. I need the position of the sphere, once located, to vary by less than .0001" due to environmental factors.
What material would you choose to be both stable and affordable?
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