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

[David Everett]

Ken

Where the advantage comes with the rear mounted parting tool is that the cutting forces drive the
cross slide down into the lathe bed - a solid base, minimising the tendency for the tool to dig
in.  Using the parting tool in the conventional toolpost tends to lift the cross slide, making the
parting tool less stable - more chance of a dig-in.

OK.  Make sense?


Regards

Dave
Saudi-Arabia-On-Sea



 --- Ken Christison <christison at coastalnet.com> wrote: 
> Peter,
> 
> I still don't see any advantage to simply changing the direction of the
> force on a revolving piece since the force is the same regardless.
> Seems like a follow rest or center rest is the only way to minimize
> flexing.  Is there any other reason for this technique?
> 
> Ken
> 
> > 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
> >
> 
> 
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