This can be done using
any combination of machine or hand tools -- from simple flat and
round files, to die grinders, mills and lathes. While there is no
absolute radius or bevel value, generally a 0.0625 - 0.125-inch
radius on most edges is sufficient.
Outside bevels may look better with as much as
0.25-inch radius -- just make sure the bevel isn't cut too close to
the main bolt through-holes.
* It is important to keep in mind that the flat
mating faces of the bearing and pump bodies are precision-fit cuts
and care should be taken to avoid gouging or damaging the surfaces,
or oil leaks may develop.
When clamping the blocks in a vise, remember
that aluminum is fairly soft metal -- always use plywood or pine
buffers between the vise and the part being worked on.
