Re: [CAD_CAM_EDM_DRO] Re: Question for Kim Lux

On Monday 05 January 2004 20:28, Kim Lux wrote:

> I stated that I would like the motors to run faster than they do
> presently.

Sure .. I'm just not sure why you think they have that 'max rated RPM'
sticker on them?

> > if at max rated voltage the motors are not providing the speed you need
> > out of your machine and are pulling well below max rated current, then
> > the answer is to lower the gearing. Over-volting your motors won't
> > 'solve' anyhting.
>
> The motors are already direct driving the screws. The issue is that the
> motors have more torque than they really need and also run slower than I
> would like.

well as I stated above, the correct engineering solution is to gear to suit
(or use screws with a coarser pitch). Its hardly rocket science now is it?

Exceeding the maximu plated rpm and voltages by 50% is not really a
professional solution, but I guess its worth a try, if reliability is not an
issue or they are only going to be used for short periods on light loads.

> They are rated for 1800 RPM and I'd like to see
> 2500 RPM or so.

yeah .. they probably just pulled that figure out of the air, manufacturers
do that all the time. You'll be fine at 2500rpm, no worries. Its only 30%
over max rated speed / 50% over rated voltage , what could possibly go wrong?

> Where do you get your knowledge from ?

In this case . .you. You told me the maximum rated speed was 1800rpm, and the
maximum rated voltage was 40V .. I presume you had read the motor rating, I
could of course be wrong .. I tend to stick below manufacturers maximum
ratings, I'm weird like that, but you go right ahead and prove those guys
wrong... you know, I bet they didn't even test them.

>Provided the windings don't fly
> apart

don't forget to post pictures now :)

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