Re: shaft torsion ?

Don't understand your view of "windup". At constant velocity there
are no "loads" (F=MA; no A, no F). In a trued-up machine, at
constant velocity, there would'nt even be a need for the cross shaft
(ignoring friction).

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Philip Burman"
<philip.burman@...> wrote:

>
> My point was that there are "machining" loads, even at constant
> velocity, that may cause "windup of the shaft. I was just

interested

> why this was not a problem in practice. I assumed it is due to the
> relatively low level of precision required with this type of

machine.

>
> Phil
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "carbonsteelsam"
> <corryharper@> wrote:
> >
> > Not unless they're overpowering your motors or there is an
> extremely
> > biased friction load from one rail to the other. With good setup

&

> > alignment the rails should perform pretty much the same and the
> > pinions would easily handle minor side-to-side fluctuations.
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Philip Burman"
> > <philip.burman@> wrote:
> > >
> > > Are frictional loads at constant velociy not an issue.
> > >
> > > Phil
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Kevin Martin

<kpmartin@>

> > > wrote:
> > > >
> > > > In the original message the system was described as "5 foot
> wide
> > > gantry on a plasma cutter" so there are essentially no

machining

> > loads
> > > (unless you count the recoil from the plasma jet).
> > > > -Kevin Martin
> > > >
> > > > -----Original Message-----
> > > > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of
> > carbonsteelsam
> > > > [...]The real differential loads will result when the router

is

> > to
> > > the extreme end of its travel and is under heavy cutting load.
> [...]
> > > >
> > >
> >
>