开云体育

-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of Charles
Sent: Thursday, October 13, 2011 7:34 PM
To: 7x12minilathe@...
Subject: [7x12minilathe] Re: Finally, a project!


All good answers:

You are now being introduced to the "specsmanship" of lathe specifications.

Actually, if you removed the saddle, you probably could get a 7 inch by 12
inch cylinder between centers going round and round. But about all you
could do is watch it.

Another way to look at lathe specifications is that you could turn something
12 inches long, or 7 inches diameter (with great difficulty), but not both.
Choose one.

Actually, the clearance over the ways is usually most meaningful when
needing to clear a large part while turning or boring a much smaller
diameter of it. Drilling a hole in a large disk is an obvious example. But
boring the cylinder hole in a steam engine casting is another. The size of
the casting may not clear the compound, but might clear the ways so you
would be in good shape.

Except for certain situations where you are willing to take on extra grief,
a good rule of thumb is to get a lathe with twice the swing of the largest
diameter you will routinely be turning.

Or for the occasional situation beyond the machine, find somebody with a
machine that is big enough.

Or find a way to design around it. For example, maybe what you need could
be handled with a length of tube somebody could cut and you could make end
caps to weld in. (I know that probably isn't a solution in your case, but
making a fabrication of more manageable parts is sometimes a solution.)

Chuck K.

--- In 7x12minilathe@..., "MERTON B BAKER" <mertbaker@...>
wrote:

Sorry, no. You are limited by the swing over the carriage, and, while it

is

theoretically possible to turn a 7" flywheel, you will find that getting

the

toolbit onto the surface is tricky, and necessitates rigging a special

tool

post. another limitation on large diameter work is power. Cutting rates
are in surface feet per minute, and the larger the diameter, the slower it
has to go. The Asian 7xs, as a rule, are not happy at slow rpms.

Mert



-----Original Message-----
From: 7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf Of wy3xinsc
Sent: Thursday, October 13, 2011 6:37 PM
To: 7x12minilathe@...
Subject: [7x12minilathe] Finally, a project!


I finally have a project where I'm hoping to use my mini-lathe, to make

some

of the parts at least.

Question- and I hope nobody thinks this is a dumb one..

My lathe is a 7 x 12. Is it practical (or even possible) to turn and bore

a

piece of 1018 steel round stock that is precisely that size? (7" round by
12" long). That's the largest piece of the project. All other parts I have
no doubt about the lathe being useable. If it won't work, I'll have to

farm

out at least that one part.

Admitted, I think I'll have to buy a new chuck large enough to accept this
stock (if such a chuck exists, which is my next question), but will the
lathe do this job without destroying itself?

Thanks, -Web in Myrtle Beach, SC



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