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@REPLYADDR Jim Wilkins <muratlanne@gmail.com>
@REPLYTO 2:5075/128 Jim Wilkins
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"Richard Smith" wrote in message news:
lycyy4f6y9.fsf@void.com...
When I was a youth there was L.H.Sparry`s "The Amateur`s Lathe" and it
did mention honing - but I never got anything like that far.
If I recall the mention was copper and fine grinding paste.
-------------------------
Lead works too, and can be cast to an exact fit to a difficult surface such
as a rifled gun bore. In general the grit is pressed into a relatively soft
material which can be cast iron or mild steel, and the harder material will
be cut faster. The grit is sorted by size by mixing in thick oil, shaking
and letting it slowly settle.
The standard advice is to avoid grinding or honing on a decent lathe because
their exposed ways are too vulnerable to abrasion by stray grit. On a
surface or tool grinder the ways are covered which limits the motions they
are capable of compared to a lathe.
The first small cheap used lathe I bought had up to 0.025" of wear on the
ways near the chuck, which varies tool height more than cutting diameter. I
used a machine shop night class to mill them straight and flat again which
lowered the half nuts out of good engagement, and reserve that Sears AA
lathe for cutter grinding, polishing and drilling small deep oil holes as
it`s more easily stripped apart to clean and spins much faster than my 10"
South Bend. I could maybe shim the carriage back up to original height with
brass stock but the South Bend with collets is so much better for threading
and even very small work like custom 0-80 screws for optics. I needed
slotted fillister heads to recess and 1-1/4" length.
With a Dremel the AA cut the teeth on the hollow circular counterbore that
opened up space around the broken-off-flush M3.5 case screws in plastic
bosses on the battery pack of the scooter, allowing me to heat the now
protruding screws with a soldering iron to soften the plastic and enable
unscrewing then with needlenose pliers. That job alone may have repaid the
lathe`s cost.
https://www.topmobility.com/battery-pack-assembly-for-buzzaround-xl.htm
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