Do not take over .003 per side, as it will heat the metal too much. Go slow and easy. The pilot on the
finish reamer will be ground the same way, and the size of the pilot will be .003 smaller than the O.D. of
the rough reamer, which will be .295.
When completed with the pilots there is one more operation to do. This is to grind four flats length ways
on the pilot for the oil to pass. These flats can be ground on the lathe if the lathe is equipped with an
indexing head, or you can grind them by hand if your careful.
You should leave about .060 on each corner of the pilot. This is usually enough to give good oil flow to
the reamer. If this should give trouble on chips plugging up the reamer flutes, turn up the oil pressure to
get more flow. The finish reamer will give no trouble if it is sharpened well.
GRINDING THE CLEARANCE
Now comes the time to relieve or grind the clearance on the back of the flutes for clearance. If you do not
have indexing on your lathe, it will have to be ground by hand. If you have indexing on the lathe, the tool
post grinder will grind this clearance. To grind the relief by hand you will need a small hand grinder. Coat
the reamer flutes with a lay out fluid.