Bearings

A piece of 1/2" black acetal arrived today.   (It is amazing how reasonably priced leftover blocks j is acetal are k on eBay.   Everyone has a chunk leftover from a project.   I have sold some myself there.)  It is about the same density as carbon fiber composite and because these blocks are also the bearings,  I do not need the steel needle bearings inside them.   It is not a stiff or strong as carbon fiber,  but these are not high load or high rpm uses, so it does not matter. 

Acetal cuts with much less effort than carbon fiber.   I cut two blocks with little drama.  I also increased feed rate for the second two blocks.   

When these are done,  I will cut a .494" hole in the center for the polar axis.   I want a press fit,  because the axis over time should grind a bearing into the2 2 acetal,  which is nowhere near as hard a acetal.

Then drill and tap 6-32 holes on each side.   Unlike carbon fiber,  acetal taps nicely and is very strong.  Again,  the load is not much.   The .13" long 6-32 screws should perfectly hold them in the axis housings.  I could go longer but there is no need.