[SEL] rear tool post...deviates!!!!

[Jim and Diane]

OK the reaction is different but it should not make any difference unless
you are depending on gravity to hold the spindle in one place.
The main reason for the rear tool post is convenience and speed.  On a
turret lathe the cut off tool is almost always upside down and mounted in
the rear.  This allows room for 4 tools in the front square turret.  If this
is done right the rear tool is in the correct position to cut off when the
last front tool has finished whatever it is doing.  I ran a turret lathe
many years ago, the foreman had strongly held feelings about doing things
fast and I had this principal very firmly brought to mind on several
occasions.

Jim

Jim and Diane Kirkes
Hemet, CA
jd.kirkes at verizon.net
----- Original Message ----- 
From: "Curt" <curt at imc-group.com>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Monday, February 21, 2005 7:11 AM
Subject: Re: [SEL] rear tool post...deviates!!!!


> Peter,
>
> > the main idea being that they don't lift the headstock
> >shaft when cutting metal as they are on the other side of the job
> >compared with the normal turning tool.
> >
> >
> Peter & Peter,
> OK I'll bite, how are parting forces different than regular turning
> forces? Both exert the same tendence to lift the headstock. But is this
> a problem? I've seen a few of the back parting setups mentioned and just
> figured it was a time saving thing....eliminating a tool change. You got
> my curiosity up.
> Curt Holland
> Gastonia, NC
>
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