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Author Topic: Limits - Am i being too smart ;)  (Read 5773 times)

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Offline ger21

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Re: Limits - Am i being too smart ;)
« Reply #10 on: March 13, 2016, 08:22:44 AM »
If your not using the encoder DRO's for anything, you can emit the DoOEMButton(133).
Gerry

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Offline Davek0974

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Re: Limits - Am i being too smart ;)
« Reply #11 on: March 13, 2016, 08:27:54 AM »
Ok, thanks i'll pull that out.

I'm still not happy though as homing accuracy seems poor, probably these sensors again, i have run many dozens of homes and the actual home position varies by about -0.4mm and + 0.6mm which i think sucks, but i may be wrong here??

Debounce was tried but makes little difference.

I might order some full-price sensors from CNC4YOU and try them out.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline ger21

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Re: Limits - Am i being too smart ;)
« Reply #12 on: March 13, 2016, 09:04:35 AM »
Yes, ±.5mm sucks for homing accuracy. :)
Gerry

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JointCAM Dovetail and Box Joint software
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Offline Davek0974

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Re: Limits - Am i being too smart ;)
« Reply #13 on: March 13, 2016, 09:33:21 AM »
Seems i have a BOB PSU issue - if i run the BOB and sensors from my bench PSU it all works perfectly, no flickering LEDS or false triggers and i can enable the limits properly.

If i run from the 15v SMPS i get flickering LEDS and duff sensing, but it only does it when the drives are enabled! Had not noticed that before, seems the drives/motors/psu are interfering with the BOB some how.

Getting baffled now :(
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline Davek0974

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Re: Limits - Am i being too smart ;)
« Reply #14 on: March 13, 2016, 10:47:24 AM »
Well, I am just about ready to give up for the day! And I hate shutting up shop on a negative position. :(

It works fine if i run off the variable bench PSU but not on the little SMPS, but i don't think it's needed to spend £110 on a PSU just for the BOB!

Here's a video showing the result on the SMPS...
https://youtu.be/m9_6XrzW0Fc

And here's one showing what I expected and indeed what I get on the bench PSU...
https://youtu.be/XcI2J5RcyrE

Now the big question is WHAT DO I DO??

Obviously I will be throwing this at CNC4YOU as it's all their components but they usually blame the setup or the earthing or the wiring blah, blah, blah...

Facts...

The drive PSU & drives wipe out FM radio when engaged.
The BOB PSU does not work with my sensors.
The sensors appear fine when on a different PSU.
I am a bit p1ssed off at present as this little setup should have been easy ;)

Just about ready to pour a big one.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline Davek0974

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Re: Limits - Am i being too smart ;)
« Reply #15 on: March 13, 2016, 11:08:19 AM »
If your not using the encoder DRO's for anything, you can emit the DoOEMButton(133).

BTW i took that line out and now it does not zero the work DRO's so i guess I'll be putting it back ;)
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline Davek0974

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Re: Limits - Am i being too smart ;)
« Reply #16 on: March 15, 2016, 02:30:44 PM »
Well, I'm officially baffled but very happy!

Changing the BOB PSU has completely fixed the issue, I have now got sensible homing routine, all limits working and the homing accuracy is now better than 0.1mm, more like 0.00 to -0.06mm variation over 25 homing calls.


:)
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline Davek0974

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Re: Limits - Am i being too smart ;)
« Reply #17 on: March 15, 2016, 02:31:33 PM »
Yes, ±.5mm sucks for homing accuracy. :)

Now 0.00 to -0.6mm I think that's acceptable??
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.

Offline ger21

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Re: Limits - Am i being too smart ;)
« Reply #18 on: March 15, 2016, 02:36:01 PM »
Is it .6, or .06mm?
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
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Offline Davek0974

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Re: Limits - Am i being too smart ;)
« Reply #19 on: March 15, 2016, 03:06:15 PM »
I ran 25 homing routines and the dial indicator I had on the Y axis varied from zero to -0.06mm overall, generally nearer to zero.
Bridgeport Mill, Mach3 V062, CSMIO-IP/A controller, AC Servo Drives.
Plasma table, Mach3 V062, Step motors, C&CNC THC.