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Author Topic: mach appears to send odd signals  (Read 7718 times)

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Offline Hood

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Re: mach appears to send odd signals
« Reply #10 on: March 08, 2014, 02:50:03 AM »
If your kernel is jumping to 92-95 you still have serious problems, you need to get that sorted.

Hood
Re: mach appears to send odd signals
« Reply #11 on: March 09, 2014, 07:09:58 AM »
Hi Hood,
It is fairly steady on 94 but occassionally drops to 93 or 93 and then goes steady on 94 again for quite q while and perhaps goes up to 95 for a second then goes back to 94 again for quite a while. Any idea what will be causing this fluctuation? And what the possible cure might be?
GeoffB
GeoffB

Offline Hood

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Re: mach appears to send odd signals
« Reply #12 on: March 09, 2014, 07:44:22 AM »
Ok let me ask, are you meaning 92-95 or are you meaning 24,992 -24,995?
If the latter then that is of no concern, if the former then your pulserate is screwed up.
Hood
Re: mach appears to send odd signals
« Reply #13 on: March 09, 2014, 12:29:03 PM »
Hi Hood,

Sorry that's me  shortening the figures - yes steady at 24994 with the odd 24992 or 24993, and then the odd 24995 - all those over and below 24994 are for a fleeting second or so whilst mainly steady at 24994. Regarding the odd stall on the particular .nc programme would a Smooth Stepper cure this? Willing to do anything that cures this problem - head against the wall time (now getting pretty hard!!). It is not just this prog that has the problem but happens in some others (not all) too - and sorting all mechanical and stpper motors, etc hasn't cured it. I can jog the X & Y axis all day long with the arrow keys and it runs perfectly - just when running in a programme that has the problem.

GB
GeoffB

Offline Hood

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Re: mach appears to send odd signals
« Reply #14 on: March 09, 2014, 04:07:56 PM »
Does the driver test have any spikes on it?

Have you tried reducing the accel and Velocity to see if that helps?

Smoothstepper may help but only if your computer is not capable of a clean pulse or your computer is struggling to keep up with Mach.

Hood
Re: mach appears to send odd signals
« Reply #15 on: March 11, 2014, 12:10:17 PM »
Hi Hood,

The driver test looks steady at 25020 with the occassional change to 25018-21 for a brief 1 sec or so - the graph looks straight lined with the odd small spikes (very small) appearing every so often.

I have already tried reducing the motor speed by 10% and reducing the acceleration by around 20% but just the same. The stall only appears to happen at the one point in the programme - on a G0 line. I have done a work around with swapping over the two pockets (ie pockets 7 - 8 to 8 - 7) which has seemed to cure the problem and it runs through the programme so far - a few aircuts without a hiccup. But, the G0 is used all over on the programme so why just this one line? There must be something that makes this happen - it has done it in a few programmes which made me start searching for the answer. The computer is a Dell dimension 3Ghz processor, etc so should be fast enough.

GeoffB
GeoffB

Offline Hood

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Re: mach appears to send odd signals
« Reply #16 on: March 11, 2014, 04:40:49 PM »
Can you try using Sherline mode to see if that helps, could just be your drivers are requiring a wider pulse.
Hood
Re: mach appears to send odd signals
« Reply #17 on: March 12, 2014, 06:14:02 AM »
Ah! You got me again - what is Sherline mode? And where can I find it? And what does it do?

GB
GeoffB

Offline Hood

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Re: mach appears to send odd signals
« Reply #18 on: March 12, 2014, 07:51:25 AM »
Config menu then Ports and Pins, right side of page.
It widens the pulse to 1/2 width, ie 40uS.

Hood
Re: mach appears to send odd signals
« Reply #19 on: March 12, 2014, 02:44:09 PM »
Thanks Hood - does it need anything else altering or do you just apply this mode. BTW, the stop gap of changing sequence on the programme for pockets 7 - 8 has worked on this one and the job is now finished - bated breath time though. But I still need to get to the bottom of why it;s happening. I'll give this mode a try.
GeoffB
GeoffB