"Philippe Vessaire" wrote

Remember polyethylene blocks may creep under load.
You need some clearance between hole and tube. I don't think you kneed
to buy a reamer, a new drill will do the job with proper clearance.

To OP: was there a +/- type of allowable clearance given, as a recommended
range?

It would seem like a necessary range of fits would have to be given. As
this poster pointed out, the coefficients of expansion for these two
different materials would be wildly different, and the clearances would have
to change for the temperature spread an aircraft would be subjected to.

I agree that a freezer/oven test needs to happen, and clearances measured,
or at least calculated clearances for the different temperatures.

Anyone got a favorite source for materials expansion coefficients?
--
Jim in NC