What is the the CAD CAM DRO CNC mailing list address?

Regards,

James
P.S.  My specifics is that I am using stepper motors on an XY table.
The lead screws are 1" inch lead and the steppers are microstepped at
1/16 yeilding 3200 microsteps per inch.  I am trying to achieve 10"/sec
second coordinated motion, which is ok.  I can get up to 5'per second
without acceleration, but it is hard stopping between magnitude moves.
I.E. when X change is greater than y change then y change becomes
greater that x change on next segment.

But there are many situations where each segment is very small, I.E.
about .125 or less for letters and detailed graphics.  This is where I
am not curtain of when I should be implementing
acceleration/decceleration.  I have a 10"/sec acceleration profile and
my top speed is 10"/sec due to limits of pic.



-----Original Message-----
From: Roman Black [mailto:fastvid@EZY.NET.AU]
Sent: Friday, July 27, 2001 6:01 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC] Motion Acceleration on two axis system


James Lee Williams wrote:
>
> Hello,
>
> I have a question reguarding how I should handle
> accerleration/decceleration on XY motion.
>
> If I have a complex path made up of several vertexs, should I
> accelerate/deccelerate on each vertex, or should I do it only when I
> change in magnitude is detected?  Or is there a typical standard way
of
> doing this?


Hi James, this is difficult and you need to specify
nature of the load and actuators.

Re the complex path, you will need to look ahead
at least one vertex (depends on speed) and
calculate max deviation from the current path.
Depending on whether you are driving
a plotter pen or cutting knife or router bit, each
has different requirements for changing direction.

Hope that helps! Have you checked the CAD CAM DRO
CNC mailing list?
:o)
-Roman

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