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

The Machinery's Handbook is the Bible of machinists everywhere. The
book costs about $150, but it should be available at a large civic or
educational library; you'll only need one table. It has the exact
specifications for all types of interference, press, and running fits
for various size shafts. If you can't get access to the book, let me
know and I'll look it up for you.

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

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

On 20 Oct 2005 22:22:51 -0700, with neither quill nor qualm,
"woodworker88" quickly quoth:

The Machinery's Handbook is the Bible of machinists everywhere. The
book costs about $150, but it should be available at a large civic or
educational library; you'll only need one table. It has the exact
specifications for all types of interference, press, and running fits
for various size shafts. If you can't get access to the book, let me
know and I'll look it up for you.

I found an older copy for $4, saving about $146. YMMV
Let "the boss" buy new copies if they're needed.


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