ilaboo wrote:
what size hole should I drill for a interference fit--looked on the
web--saw all sorts of formulas to do this but i need just a ball aprk
figure--i am planning of using a carbide bit to do it--( i understand
that the finish of the hole would be clean and polished using this
carbide bit) i do not have access to boreing bars or a reamer

any suggestion really appreciate

tia

peter

There are different classes of interference fits, and to complicate
things even more the size will depend on the type of material and its
thickness. Even if you know the exact size needed, though, finding a
drill bit of that size - and then getting it to cut a hole to exactly
that size - will be next to impossible. A reamer is your best bet.

John Martin