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

[Listerdiesel]

On Mon, 21 Feb 2005 11:22:46 -0500, 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

Hi Ken:

The running shaft has its closest tolerances between the bearing and
shaft at the bottom, due to the weight of the shaft and the
lubrication oil which tends to run above the shaft. Thus any lifting
forces will move the shaft up, displacing the oil and changing the
position of the shaft in relation to the tool, whereas the other way
the shaft is already at its lowest point and there is minimal change.

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