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Messages - geoffby

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11
General Mach Discussion / Re: mach appears to send odd signals
« 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

12
General Mach Discussion / Re: mach appears to send odd signals
« 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

13
Thanks Hood - got it.

GB

14
Hi,
I've got a frequency fluctuation problem and am trying to find the answer - but tried the link given and get a page error - not found - report. Any ideas where it is?
Regards,
GeoffB

15
General Mach Discussion / Re: mach appears to send odd signals
« 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

16
General Mach Discussion / Re: mach appears to send odd signals
« on: March 07, 2014, 01:39:04 PM »
Hi Hood,

I've reset the kernel as you suggested and the frequency is now steady at 24994 - occassionally reads 92 or 95 but mainly steady - the spindle problem hasn't reoccured. However, I still have a problem on the X axis - and every time at one point in the programme. I've checked out the line code and can find nothing wrong here - just has a G0 for the X & Y positioning at this particular line - all the rest of the programe runs fine. Ideas? I've attached the .nc programme for you to look at if you will. the line of code is at - pocket 8 - G0 X20.7665 Y2.0

GeoffB

17
General Mach Discussion / Re: mach appears to send odd signals
« on: February 28, 2014, 06:47:44 AM »
Hood,

Many thanks for the explanation - that makes things a lot clearer. As I said, as a mechanical engineer, if I can see it working then I understand, but where electronics are concerned I'm a complete neanderthal!  :) I wonder why it was set so high? I'll haved a look at this - perhaps be a few days as I'm away a bit and have other jobs that need doing - so I'll get back to you soon as I've tried it and let you know what the answer is - Fingers crossed you've hit on the answer!! :) I was thinking that there was something that had corrupted a file in the PC and was about to re-format and re-install everything. I'll give this a go before I do anything so drastic!
Many thanks,

GeoffB

18
General Mach Discussion / Re: mach appears to send odd signals
« on: February 27, 2014, 03:07:01 PM »
Hi Hood,

Thanks for the info - to be honest, I'm not that clued up on the settings side, just what the guy who set it up and advice from Mach themselves (Scot I think it was - it's a couple or more years since I emailed him) so I've really no idea what anything should be. Does it make any difference what size steppers I'm using? They are 4.2amp 300Ncm and the drivers are M442 - X&Y / DM542 on the Z with voltage of 37VDC.
Where do I find the kernel to alter? And what does this do/mean?

Regards,

GeoffB

19
General Mach Discussion / Re: mach appears to send odd signals
« on: February 27, 2014, 06:14:12 AM »
Hi Hood,
The version is Mach3-043-022.
Time in Int - varies between +3.2 to +6.5.
Pulse frequency is what you are requiring? Varies from 58629 - 42
Attached is the xml file.
GeoffB

20
General Mach Discussion / mach appears to send odd signals
« on: February 26, 2014, 02:15:39 PM »
Hi,
I'm hoping someone can help me here with a, what appears to be, spurious signals for the software. I've been running Mach3 mill for a few years and getting good results. However, I'm starting to have problems.
The milling machine runs fine, then out of the blue, the x-axis stepper occassionally momentarily stalls and looses approx 5mm in travel on a fast jog mid program - it is like the machine has recieved a spurious signal that has put the stepper into stall.
I have changed steppers and drivers and checked everything out on the machine and all is OK. Today, when doing a test aircut I noticed that, part the way into the programme, the spindle was suddenly running at 4400rpm yet checking the G-code line it was set at 4000rpm. I stopped the machine and reset - re ran the programme and it ran the spindle at the correct speed. However, part way through the programme the X-axis did it's momentary stall again loosing approx 5mm.
I shut everything down to and came back to machine later - doing a test aircut from the same programme as previously run and found that the spindle was screaming it's head off (the readout on the actual mill was giving 5300! - this is more than the max that the motor can handle - usually max out at 4500) - checked the DRO and forund that Mach had set the spindle at 8400! I noticed that the spindle factor(?) - appeared alongside the spindle speed - was at 2.2. The G-code line was 4000rpm. I have checked the G-code and everything is as it should be. What is happening? Is this wrong signal for the spindle also what is happening with the X-axis too? Can anyone help?

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