Cleaning up a reamed hole?

(Boelkowj) wrote in message ...
KB: I haven't done the job yet. But thought burnishing/cleaning up the hole was
SOP even if the hole looked smooth and almost perfect.

Larry

Reaming is a way of sizing a hole, and reamed finishes often are not
nice. Reaming aluminum is difficult to hold any kind of finish unless
the hole is within .001"-.003" of finish size to begin with.
Burninshing is done most often by forcing a hardened ball through the
hole, the hole being left .0005" or so undersize. Burnishing does NOT
remove stress risers, it only covers them up so you can't see them.
If there is a stress riser present, it is still there after
burnishing.