Messages

1

General Mach Discussion / Re: Motors stall when using Goto Z's

« on: November 30, 2011, 12:32:00 AM »

I've been experimenting some more. When I realized windows update was still enabled, I disabled it and got to 45 IPM without the dampeners. Using another faster PC, I'm up to >50 IPM. When I have some more time, I plan to see what the upper end is.

2

General Mach Discussion / Re: Motors stall when using Goto Z's

« on: November 25, 2011, 02:08:30 PM »

I only had a few moments between when the package arrived and when I left for Thanksgiving. On first try with one axis, it didn't seem to make much of a difference. When I get back I will experiment more.

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General Mach Discussion / Re: Motors stall when using Goto Z's

« on: November 18, 2011, 11:26:29 PM »

Thanks everyone for all the information! I've learned a ton.
Fixittt is going to set me up with some rattler dampeners. Cool guy!
I'll try that out and let everyone know how they work.

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General Mach Discussion / Re: Motors stall when using Goto Z's

« on: November 17, 2011, 11:39:34 PM »

The driver test says "system excellent" up to 65 Khz.
Measuring the voltage showed no difference when running the motors, it stays at 23.5 VDC. I'm not too worried running at half the rated power since the application will have little to no load.
I took the acceleration of the x-axis down to 0.1875 (the minimum it would let me set). That equates to 4 seconds to ramp up to speed. I then jogged the x-axis up to 45 IPM with no problem several times in both directions.
When using goto z's at this slow ramp rate, it usually gets up to speed (not always), but after a little bit at the top speed starts to stall or as it is starting to slow down.
In addition to that test, I tried to squeeze the motor shaft with a cloth while using goto z's (to see if I could change resonance). Still, it stalls.
Note that I've never had trouble jogging with any axis up to 45 IPM. I'm not sure why goto z's is different than jogging. Does anyone have any ideas for why these would be different within mach3? Is there a reason the resonance would be different with either method?

Also, it seems odd to me that the y-axis or z-axis will stall too even though they have different loads due to the design of the taig mill. Shouldn't there be a difference?

I'm curious about the dampers though. Does anyone have a source for purchasing or design? If they are not too expensive (or easy to build) I could give one a try.

Thanks a ton for the input so far. I really want to understand this issue.

5

General Mach Discussion / Re: Motors stall when using Goto Z's

« on: November 17, 2011, 09:18:27 AM »

No problem Tweakie. Yes, I did own a company named Software4u and paid for mach probably ~6-7yrs ago.
The motors are 23H276-28-4B XYLOTEX 269 oz-in on 3 axis. The 4th axis is a Moon 17HD4063-01N (but I disabled that axis yesterday and the problem still exists).
The drive is XS-3525/8S-4. The vref is set to ~3.2v (on 3 axis) which translates to ~2.2A, the 4th axis is set to 1.2V (0.83A). I'm using a 24V power supply.
The problem occurs on all 3 axis'. All 3 axis work at 45IPM (independently) when I jog, but when I zero (independent axis') or use program control the motors stall.
I'm using the default mach screen

I'm running out the door right now, but I'll try the following experiments tonight:
(1) driver test at 35khz
(2) swapping cables to motors

6

General Mach Discussion / Re: Motors stall when using Goto Z's

« on: November 16, 2011, 08:51:11 PM »

I tried disabling the a-axis, but the results were the same.

Rich, this is the latest released version on the website (vR3.043.022 -- lockdown) is what is installed; is that not supported?

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General Mach Discussion / Re: Motors stall when using Goto Z's

« on: November 15, 2011, 10:20:39 PM »

My xml is attached. I'm very curious to see what you find!

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General Mach Discussion / Re: Motors stall when using Goto Z's

« on: November 14, 2011, 10:01:11 PM »

I finally had a little time to try that out. When holding the shift key, jogging the axis has no problems. It runs easily up to 45 IPM. Any other ideas as to why the goto z is different?

9

General Mach Discussion / Re: Motors stall when using Goto Z's

« on: November 13, 2011, 10:12:31 AM »

I'm only using one axis when jogging. The same goes with when I use the goto z's. I've only moved it away from zero on one axis.

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General Mach Discussion / Motors stall when using Goto Z's

« on: November 12, 2011, 09:57:43 PM »

I've been using my mill at lower speeds for awhile and decided to see if I can increase the speeds. The problem I am having is that I can go up to 45 IPM when I use the keyboard without issue, but when I hit GOTO Z's, it will stall the motor (as it ramps up to the desired speed). I've tried several acceleration numbers that seem to make no difference. I can lower the IPM back down to <20, but that's boring! Anyone have any idea why GOTO Z's would be different than keyboard pendant control and what I could do to potentially get this working at 45 IPM? Thanks for any help!