You had better farm this job out to someone else. Drilling the hole is not
the way to go. Anything you could do without precision machinery is apt to
destroy the accuracy of a jeweler's lathe setup.

Bob Swinney
"ilaboo" wrote in message
hlink.net...
i am adapting a lathe chuck 3 " to a jewlers lathe ( Lorche)--read working
on small parts


i want to fit the lathe part ( essentaly a long bolt) with aflange and a
20mm extension--i ddo not want to machine anything on this item

my plans are to create a bushing out of steel--screw it into the lathe
chuck and drill a hole for the lathe bolt to press fit into the bushing


diameter of the lathe bolt is 10mm

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