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Ultem Problem

Ultem Problem

Ultem Problem

(OP)
Please see attached picture.
Not sure why it crack. It seems that the crack start at internal slotting area.
It does not crack when we receive the part, but after a while, it break into two pieces.
1. This might due to the stress concentration at one point?
2. I assume that: When the bottom surface of the machine part is not flat to the ground (let say flatness is about .012", bow in one direction) , when install it to the base, due to the strain it start cracking. I think Ultem is kind of brittle after looking at the cross sectional view.

What do you guys think?

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