Machsupport Forum
Mach Discussion => Mach4 General Discussion => Topic started by: Raymondo on February 24, 2019, 05:48:54 PM
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Hi
I have a wireless height setting gauge for setting tool height the probing function works well but is inconsistent because of Z axis over run I believe
Even when the feed speed is really slow though when slow it is not so pronounced I would like to modify it so it is like the home limit switch these find the switch then slowly back away till the switch turn back of
I have found the scrip for the touch probing but do not know how to fix it so it triggers on the retraction and set the height from that point
has any one done this and can help
Regards Ray
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Hi,
what motion controller are you using?
When Mach executes a G31 probing move the motion controller detects the probe touch event and stops all motion.
Motion controllers are very fast so unless you are approaching at a ridiculous seed there should little or no
overrun.
For example I have an ESS motion controller and when probing at 100 mm/min (no fast but not really slow either) the
overrun is less than 1 um (0.78um).
It sounds to me like the probing code you are using is relying on Mach to detect the probe event. In that case the motion
controller will propagate a signal back to Mach, Mach will generate a stop signal and send it back to the motion controller
to execute. The 'around the loop delay' could easily be 1/20 sec whereas a good motion controller will detect and stop
motion within a few tens of micro seconds.
What code are you using to probe?
Craig
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Hi
I am using a screen that came with mach4 and has a touch button that takes me to a new probing screen but
i only use the z axis probe if I could get to say 3 to 5 micron accuracy I would be home and hosed
I will have a play with the G31 in the MDI could you help with a bit of code for the z axis to run in the MDI
Regards Ray
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Hi,
what controller? Its the controller that does the business not Mach.
Craig
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Hi
I have a ESS controller but and it is a big BUT the height gauge is a XHC wireless gauge I did some tests with G31 and 4 times out of 10 comes to almost exactly repeatable the other 6 times up to almost 1mm .040" difference and I think it is the height gauge being flaky I can see the difference in height and with G31 could slow the feed right down this made it better but still not good or repeatable
I will try another height gauge any idea's of a good brand I had a bunch of problems with a XHC controller that was not a good experiance and maybe the height gauge is not much better
Regards Ray
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Hi,
I use the ESS and have no problems with overrun, I suspect you are correct about XHC.
If you've read any of my posts you will know I hate XHC with a vengeance. I am NOT a disinterested observer.
I don't have any recommendations excepting the obvious.....Reinshaw and/or Heidenhan!!!
Craig
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Blum makes a good line of probes/tool setters too. None of the good stuff is cheap, unfortunately.
Steve
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These are pretty good.
eBay item: 143067989514
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Hey Chad,
Just out of curiosity, what's that little side thingy on that tool setter you linked? I almost bought one to find out, still might!!!
Tom
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Its an air nozzle. You can hook up an airline to blast the chips off of the top of the tool setter. Pretty cool idea really, just hook up a solenoid to it.
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Hi Chad
I looked at that setter but it is 75 mm high that's 3 inches and on my router this would be to high though I did wonder about that post on the side and what it was for so now I know
I am going to pull the XHC wireless one apart and see what I can see who knows it may be some thing simple
regards Ray
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I take back half of what I was thinking about XHC I figured I had nothing to loose so pulled the sender probe part to bits they only have 2 battery's so work on 3 volts so any resistance is a problem there is a tiny little spike about 1 mm diameter that is spring loaded and hits a stainless steel plate to make the circuit the plate looked like it still had the coating of oil on it that is on the sheets before they are stamped i cleaned and sanded the plate with 600 grit and used brake clean to dry it at 5 inched per minute feed the worst I can get is .0002" and most times within .0001" so its working and it is great to have a wireless tool setter and it is working great ( for now) so problem fixed thank to any and all who replied
Regards Ray
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So my probe and all works fine in Mach3, now thinking of going to Mach4 with the same Warp9 ESS setup. Am I going to have issues? Trying to do some research here and not getting a clear picture. Yeah and I would like to run the whole setup on Win10 Pro, a change from Win7 64 bit of course.
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Hi
I am running win10 pro and ESS now I have the XHC probe working as it should the thing is a absolute Gem it runs perfect and the probe works great
I am now working on a 8 tool tool changer
Regards Ray