RE: MAX-VELOCITY global = bad

CNCpro has individually tunable max velocity and acceleration limits for all
four axis'. All moves - linear, circular, helical, rapid and jog are
ramped, so it should work with the 1150 oz-in motors. The interface is in C
and the low level portion of the profiler was written in assembler (Yeager's
a real man ;) . I have the software running on my office computer now and
hope to have the mill running on it the weekend. So far, I'm impressed. At
$175, it will be the best money I've spent if it works as well as expected.

Microkinetics is sending me a new X axis amp in the hope it will cure the
problem of added steps. I must admit they have excellent service. Just
wish their products were as good as the support.

Doug Harrison

> -----Original Message-----
> From: Clint Bach [SMTP:clintbach@...]
> Sent: Thursday, December 02, 1999 8:07 AM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: [CAD_CAM_EDM_DRO] MAX-VELOCITY global = bad
>
> From: Clint Bach <clintbach@...>
>
> Ouch!!!
>
> MAX_VELOCITY not being on a per axis basis can be severely limiting. On
> my machine X and Y are cable drives and Z is a lead screw drive with a
> completely different motor and everything. Z will never be as fast as X
> and Y without a complete rebuild... If I were to add the planned rotary
> table it may (or may not!) even be as fast as the z axis is now. This
> could drag the machine down to a crawl for no good reason. My AHHA
> control has individual maximum velocity settings on each axis so it
> isn't a problem normally. It just slows down when needed.
>
> In my opinion per axis MAX_VELOCITY settings should be on the very top
> of the "What do we want" list! I guess that with a little creativity a
> work around could be done. In my case I could set the max_velocity to
> the speed limit of the X and Y axes and use a feed rate command whenever
> I move Z at maximum rate. It wsould work but what a pain.
>
> Thanks,
>
> Clint Bach
>
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