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Unread 27-10-2014, 14:05
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AKA: Cory McBride
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Re: CNC Machining Bearing Blocks

If you want to make these for the season, make a few now to understand the best sequencing and workholding.

They're relatively simple parts but they do require good tolerancing and concentricity to be held between the bearing bore and the OD/ID of the sleeve on the backside (depending on which side you're making). You can easily create scenarios where the shaft is hard to get through both bearings, or doesn't spin nicely if you don't do it right.

I would caution anyone from blindly copying the fixture that 254 made that was linked by two posters in this thread. That was the first fixture I designed and is suboptimal in a number of ways. It took 4 years to get a combination of good fixturing/setup practices and CAM tweaks to get programs we can confidently run for good parts the first time, every time, with minimal operator intervention and without ejecting parts from the fixture/breaking tools/not holding tolerances.

Far better to start out with soft jaws, as you will need to know how to cut them for far more parts than just bearing housings.
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