What should be the allowance for press fitting?

[ScrapMetal]

(05-29-2012, 12:37 PM)ukazak Wrote: Someway I have to enlarge the center hole a bit more, but how?
Unal

Why not get, or make, a very small boring bar and chuck them up in the lathe? Could be made with a chunk of carbide saw blade, grinding down an old piece of HSS tool bit, etc. Keep the length short as possible and it should be rigid enough to cut brass.

These center holes are slightly larger (about 6mm) but that's how I enlarged them after using too small of drill to make them:



Pain in the rear but it worked.

-Ron