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

Listerdiesel listerdiesel at gmail.com
Mon Feb 21 08:17:56 PST 2005


On Mon, 21 Feb 2005 15:39:39 +0000, Prepair Ltd <prepair at easynet.co.uk> wrote:
> On Mon, 21 Feb 2005 10:11:22 -0500, you wrote:
> 
> >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
> 
> Draw a piece of bar looking from the stailstock end of the lathe,
> direction of rotation anticlock looking at the end.
> 
> Draw a tool cutting from the left hand side, the reaction to the cut
> is to lift the bar vertically?
> 
> Then do the same on the opposite side of the bar, keeping the rotation
> the same but with the tool inverted, the reaction is downwards?
> 
> Peter

I think that there are a couple of angled rear toolholders for just
that purpose in the stuff we picked up on ebay, I'll have a look and
mount one up and take a shot of it.

Peter
-- 
Peter A Forbes
Email: listerdiesel at gmail.com
Web: www.oldengine.org/members/diesel



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