Re: shaft torsion ?

Acceleration of the gantry should not cause much torque on the shaft
by itself. Which ever tooth on which ever pinion engages first, will
be the one to carry the load. So the load could jump back and forth
between pinions due to very minor mechanical variations in the
gears, but will be insignifiacant and undetectable without
instrumentation. The real differential loads will result when the
router is to the extreme end of its travel and is under heavy
cutting load. Without doing a calculation, I would guess that a 1/2"
shaft would be fine. If you really want to blow your mind, take a
look at the axel shafts of the AWD Honda mini SUV (the CRX ??). They
look to be in the 1/2" to 5/8" size and see part of the 100 HP
engine output at times.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<dave_mucha@...> wrote:

>
> Thanks guys for the comments. I think the dia of 1" is probably

what

> I'll go with as the shaft will be cheaper than a 1/2" steel

shaft. As

> Paul said, it seems small.
>
> Where is the
> > drive point located? It is toward the center of the the rod or

at

> one end
> > of it?
>
> I have not placed the motor, but I like the idea of putting it on

one

> side as it makes the wire run shorter and puts it near the side of

the

> table.
>
> Dave
>