On Tue, 25 Jun 2013 10:27:10 -0400, Ed Huntress
wrote:
On Tue, 25 Jun 2013 09:30:10 -0400, Ned Simmons
wrote:
On Mon, 24 Jun 2013 23:32:42 -0700 (PDT), Ivan Vegvary
wrote:
Le Blonde 13" lathe approx. 1947 vintage.
The tailstock quill in this lathe is loose. I've been living with it for 15 years and now finally want to correct it or move on to a better lathe.
Even when fully clamped and only 2" extended you can observe the quill jiggling within the tailstock when trying to enlarge (drilling) a hole from 15/32 to 31/64 in brass.
The seller alerted me to this and told me the lathe was probably used for tapping purposes allowing the quill to slide back and forth while disconnected. Don't quite understand the procedure, but doesn't matter at this point.
My question: Is there an inexpensive fix for this, or should I simply sell the lathe with the proper disclosures.
Only other gripe is the 500 maximum rpm along with a little vibration in some of the headstock gear settings.
Any advice would be appreciated. I would probably be happier with a smaller lathe with higher speeds.
Ivan Vegvary
There's Moglice:
http://www.moglice.com/index.php
http://www.moglice.com/handbookpdfs/handbook.pdf
You'd rough bore the tailstock to make enough clearance for the
Moglice, fixture the quill in its proper location, make dams as
required to contain the goo, inject the Moglice of the proper
viscosity, and let it set. The stuff cost $25 - $45 for a 50 - 100ml
kit.
Is Moglice hard enough for that? Compression strength of epoxy
(Moglice) typically is around 5,000 psi. Moglice claims 23,000 psi. I
have no freaking idea how they make that claim, unless they have some
magic filler that takes up all the load. And the side load on those
quills can be pretty high, especially if some klutz let a chuck work
lose while drilling or tapping, and bell-mouthing the bore of the
tailstock.
Anyway, since it's a straight sleeving job on many lathes (I don't
know the LeBlond), I'd press in a piece of brass tube and ream it to
fit, after grininding the quill to make sure it's straight and
uniform.
Or I'd try. Whether I'd succeed is another question. g
Though I can't vouch for the properties, Moglice is heavily filled. It
can be used to rebuild feed nuts, which I imagine is a more demanding
app than a tailstock quill.
http://www.moglice.com/applications/...oll_quill_bore
I did the way bearings on the work drive for a deep hole drill a
couple weeks ago. The work drive weighs 800 pounds, but the bearing
pressure is not too high. I'll let you know in 10 years how it worked
out. g
--
Ned Simmons