Good Morning, Roy:
I got around to shimming the headstock this weekend past. Took several tries but the head and tail stock are now in perfect alignment. Once this was completed, I centered a length of 12L14 between centers and indicated both the top and rear of the stock for alignment. I got readings of less than 1/2 of 0.001" in both planes which I thought were pretty accurate. When I took a light 0.010" cut, both ends of the stock were spot on, but the center was about 0.007" larger. What would cause this slight "bulge" in the center of the stock? I had the live center firm but certainly not forced into the stock to cause a bow in it. As I do not have a follower rest, would that eliminate this minor change in diameter, or is this within reason for the accuracy of these machines? Best regards, Nick
"roylowenthal <roylowenthal@...>" <roylowenthal@...> wrote: Shimming is valid; I suspect they'd replace your lathe with
current production, not an exact duplicate of original. Shimming is
also much easier to undo than cutting ;-)
Roy
--- In 7x12minilathe@..., Nick DeFeo <ntdefeo@y...> wrote:
Point well taken Roy, although I have contacted Homier several
times, and wonder if I do exercise the option to return the lathe, if
they will give me the "newer" style 7 X 12, or another of the older
style, which is what I have. While both have their shortcomings, the
older Homier does have some additional features not found on the
newer style: oil ports, way wipers and lead screw extension. I will
attempt to shim the headstock, as this seems to be far less
complicated than cutting the tail stock base, as the tail stock does
indicate true in all three planes. Regards, Nick
"roylowenthal <roylowenthal@y...>" <roylowenthal@y...> wrote: My
thinking on a flycutter was primarily for surface finish. With
either an endmill or a flycutter it's going to require multiple
passes of light cuts. With no rational reason, I prefer the
appearance of the flycut surface; it's strictly aesthetics :-)
There is the issue of why not make it Homier's problem? I know
some of us (me), suffer from "male answer syndrome" and hate to
leave
a problem personally unsolved. However, the posts pointing out
that
this is a vendor QC problem, raise a valid point. As delivered,
the
lathe was unsatisfactory; the vendor's low budget "fix" has not
corrected the problem; time for a refund or replacement machine.
Roy
--- In 7x12minilathe@..., Nick DeFeo <ntdefeo@y...>
wrote:
Roy:
I am wondering if using end mills might be better suited in
correcting the base, due to the limited amount of stock that needs
to
be removed from each surface, especially when quasi machining in a
horizontal plane. I have had some experience using flycutters years
ago (Bridgeport mill), and wonder if the milling attachment can
withstand the forces produced by the flycutter. The milling
attachment seems to be the most cost effective way to go, requiring
just a good angle plate and a suitable vice for the compound
assembly. Thanks for the excellent tip on getting this corrected
with
a different method! Regards, Nick
"roylowenthal <roylowenthal@y...>" <roylowenthal@y...> wrote:
A
milling machine is the nicest way, but, a cross-slide milling
attachment (Varmint Al's) and a fly cutter will work. Once the
errors are "mapped," mount the pieces (with shims) to indicate
the
same errors. Take light cuts until the whole surface is
machined,
reinstall & re-measure; correct any errors that crept in.
Roy
<<SNIP>>
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