Re: Why is the push to such high step rates (Grex and Arc100)?

Yes there are. They are usually embedded OEM applications, non-CNC
related.

How does it hurt you if a piece of equipment can generate high step
pulse rates? Just use a lower speed range. The technique used has no
cost associated with the rate of step pulses generated. It costs the
same to generate 4,194,304 step pulses per second as it costs to
generate 1 pulse per second.

Mariss


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

>
> Engineer or not, it is all going to have to come down to some
> practical application otherwise it is nothing more than a peeing
> contest.
>
> I am well aware that there are many more applications beyond machine
> tool for motion control, but I would just like to see a practical
> application that utilizes such performance. Dave may have hit on
> something with a rotary motion or device, but even there, you would
> need resolution and probably not speed - star tracking is a pretty
> slow (make that extremely slow) process.
>
> I have seen some laser engraving machines that do marking on metal
> parts (as well as others) that was very fast - VERY FAST. Ofcourse
> in that application, the laser and parts are stationary and only a
> mirror is moving the beam (as best as I could tell). I don't recall
> all the specifics but I seem to recall it writing about 150
> characters on a couple dozen parts in a matter of seconds. I have
> no idea what the precision is or how fast the mirror moved or even
> what moved the mirror, I just know that something is moving and
> perhaps this is an application of this level of performance.
> However, it does seem to me that even this doesn't seem applicable.
>
> Ball screws and lead screws have maximum critical speeds even under
> tension so I don't see a direct application there. Timing belt
> drives probably can't handle that sort of velocity with a matching
> precision (resolution) due to thermal distortion and even flex etc.
> A linear motor does seem to show some promise of application but I
> don't know as there is little information I know of them.
>
> So, once again, I am back where I started, is there a practical
> application?
>
> Chris
>
>
>
>
>
>
> > Chris you need to realize that you are dealing with hardware
> engineers
> > (emphases on Engineer). I are one so I can talk about them! If the
> > latest greatest chip can do those numbers then SOMEBODY must need
> it!
> > Often times it's a solution looking for a problem.
> >
> > Forgive me if I don't get real excited about the "do everything"
> > products (all they lack is just a "little" programming). I work
> down
> > in the trenches with the guys building their own machines (and a
> few
> > OEM's). I still have to answer the most basic of questions. Most
> of
> > my support on my hardware is not the hardware itself but things
> like
> > MACH3 setup, toolpath development, How to do things like turn on
> the
> > spindle or setup Home switches (;-)
> >
> >
> > Tom Caudle
> > www.CandCNC.com
> >
>