On Mon, 12 Oct 2009, Chris Morley wrote:
> Date: Mon, 12 Oct 2009 01:53:06 +0000
> From: Chris Morley <[email protected]>
> Reply-To: EMC developers <[email protected]>
> To: EMC DEV <[email protected]>
> Subject: [Emc-developers] hostmot2 stepping folowing error oddity
>
>
> Greetings.
>
> I'm having a little problem with a hostmot2 stepper setup.
> I get following errors that I can't track down a reason for.
> Interestingly while watching the following error on halmeter
> I can see that the error is way worse in the negative direction
> then the positve direction. This is confirmed by the fact the
> following error is almost always in the negative direction.
> Can't think of a reason for that.
> This is while jogging. Going slower makes it worse.
> If I do go moves in MDI there seems to be less of problem
> I can move around quite a bit- only occasionally an error.
> Suggestions
>
> These files were generated by pncconf.
> If you see anything else really wrong please let me know.
> The only axis that I am using is X so the others won't be
> set to anything useful. I just have a test setup.
> the driver timings are really high numbers because of
> using opto22 relays that add a ton of latency.
>
> INI file:
> http://pastebin.com/m4044cb6
>
> Hal file:
> http://pastebin.com/m2fa4c0ba
>
> I will try to supply any other info as requested. Thanks for any
> help.
>
> Chris M
>
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Is it possible you simple dont have enough hardware headroom to reach you max
velocity? With 200 usec StepLen and 200 uSec StepSpace, the maximum step rate
the hardware can generate is = ~2500 Hz, I just glanced at the ini file but
doesn't a Scale of 2800 mean 2800 steps per inch? If so the maximum velocity
should be about 10% less than 2500/2800 (10% for headroom). about .8 inches
per second.
Peter Wallace
Mesa Electronics
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