On Sat, 19 Feb 2011, cogoman wrote:
> Date: Sat, 19 Feb 2011 10:17:16 -0500
> From: cogoman <[email protected]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: [email protected]
> Subject: Re: [Emc-users] Emc-users Digest, Vol 58, Issue 67
>
>
>> From: gene heskett <[email protected]> Subject: Re: [Emc-users] My
>> first wiki page
> snip
>> I must say also that since the complete step is now handled in one cycle of
>> the base thread, I haven't noticed my motors playing tunes as they change
>> speeds, it is MUCH less obvious, and that has opened up another octave on
>> the maximum speed for me. In fact, I have slowed my base thread to about
>> half of the maximum my box can do without appearing to effect its
>> performance at driving the machine. Its quite happy with a 50 u-second
>> base thread, which in turn makes the video back plot in axis a lot closer
>> to real time. That elderly mobo can be pushed to under 25 u-seconds but
>> other things like the video get pretty laggy then.
>>
>> -- Cheers, Gene
> I'm just curious about what stepper motor controller you use that allows
> quadrature input. It seems step pulses, whether step/direction, or step
> up/step down are the common interfaces. I would think that quadrature
> makes a whole lot more sense.
>
<rant>
Oh it absolutely makes more sense, half the logic in our hardware step
generator is timers for holding up the rate generator to meet step/dir specs.
With quadrature all that waste logic could go away. Also with quadrature a
software step generator need only do one port write per base thread. For
buffered hardware step generators (not an EMC thing) the step generator is
much simpler bacuse it does exactly what its told.
How much easier stepconf would be for newwbees with no step timing specs to
worry about! If I ruled the world step/dir would be banned...
</rant>
Peter Wallace
Mesa Electronics
(\__/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.
------------------------------------------------------------------------------
The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
Pinpoint memory and threading errors before they happen.
Find and fix more than 250 security defects in the development cycle.
Locate bottlenecks in serial and parallel code that limit performance.
http://p.sf.net/sfu/intel-dev2devfeb
_______________________________________________
Emc-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/emc-users
