On Wed, 28 Sep 2011, Chris Morley wrote:
> Date: Wed, 28 Sep 2011 05:20:02 +0000
> From: Chris Morley <[email protected]>
> Reply-To: EMC developers <[email protected]>
> To: EMC DEV <[email protected]>
> Subject: Re: [Emc-developers] hostmot2 stepgen bug
>
>
>
>>
>> The problem is its fairly rare, and quite system dependent. I cant duplicate
>> it here even with a base thread, And I dont think Sebastian was ever able to
>> duplicate it.
>>
>> Do you still have the very large dir change setup/ hold numbers?
>>
>> I suspect they are related in pushing the stepgen correction over the edge
>>
>
> It may be the the two systems I used were particularly sensitive.
> Maybe most other always set maxvel and maxaccel to values other then 0
> As I said for me even the unchanged sample config would fail.
> one other fellow messaged that if he set the base and servo thread just right
> it would work fine. (kinda suggests a timing problem as you said)
>
> At some point hostmot2 changed and the problem showed up for me.
> I just can't remember now which version of EMC was fine and which was not.
> your now talking almost two years ago.
> It may sound that I'm complaining, I'm not.
> I'm just saying the problem was reported before and has been around for a
> while. I reported, and gave any info that was asked (as far as I remember).
> setting the max setting as you suggested the last time works for me without
> fail and thats good enough for me and PNCconf
>
> I'm not at my machine to check the step timing numbers.
> but I would guess that the last config would have timing values of all 1000ns.
> I originally had very large numbers because the OPTO 22 opto I was using
> were very slow. (I was just testing at the time)
> I now removed the optos and directly drive the step controller with the
> mesa 5i20. The PARKER step controller has it's own optos.
So I guess the question is does your system exhibit the problem with more
normal dir change timings?
>
> Cheers Chris M
>
>
>
>
>
Peter Wallace
Mesa Electronics
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