RE: [CAD_CAM_EDM_DRO] Re: Stalling motors?

Monty,

I don't think you have posted any specs on the motors other than the
torque. What is the rated voltage and amperage? If the motors are high
inductance that will kill your speed. You also have not mentioned how
they are wired in the posts I have looked at. Are they 4, 6 or 8 wire
and how do you have them hooked up?

I also wonder about the gearing you are using. I have a buddy that has a
plasma cutter he made from a Torchmate kit that sounds about like yours.
It is set up with some 135 oz/in motors direct drive with the spur gears
on the motor shaft. It easily does a couple hundred inches per minute.
With the reduction you have the motors may be pushed up to an RPM range
where there is just not any torque left. My guess is that your step
increment is much smaller than any tolerance you will every be able to
hold with a plasma or flame cutter.

Tim
[Denver CO]
Sherline Products at Deep Discount
Mach1 & DeskCNC with Credit Card ordering
Contact me for discounts on DeskCNC & Sherline bundles
www.KTMarketing.com/Sherline

> -----Original Message-----
> >
> All axis are mounted with bronze bushings{x} and bearings{y} and
> both use ball bearing thrust washers & shaft collers to hold shafts
> in place. I have went through alot of trouble to make everything move
> easely and smoothly. Moving x znd y shafts by hand, I feel very
> little resistance and no binding. As far as the caculations I did not
> enter weight/mass for x axis (about 15#),recalculated with 20# and my
> requirments changed to 86 in/oz. Should my 125in/oz motors be able to
> move the gantry assy. at higher speeds than what I am seeing? As far
> as power supply I did check voltage with and without motors running=
> 67V and reel steady. Any thing else I can check?
> Thanx,
> MONTY