Thread: aluminium machining
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14-03-2013 #1
For two off, CNC isn't really worth it.
A lathe with four jaw chuck would get the boring done. Bore center bore and one bearing recess, flip, dial in, bore other recess.
Mill would soon sort out the flanges (either horizontal with a slab mill, or vertical with flycutter or large facemill). Then holes can be drilled in a pillar drill.
If they're getting made from sawn stock, you'd have to mill at least 4 faces flat first (you could face the other two in the lathe), and to save set-up time you could machine the flanges at the same time before doing the boring.
A couple notes about the drawings-
1) what tolerance do you need on the bearing bores (i.e. interference, sliding)?
2) if you're putting a 8mm bolt through the flange holes, you need them drilled larger than 8mm for clearance
I could do them, but I just don't have the time.
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