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Author Topic: Limit switch and probe trouble shooting.  (Read 1277 times)

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Offline Mogal

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Limit switch and probe trouble shooting.
« on: April 06, 2016, 03:12:38 PM »
Okay, this one has me completely baffled.

I just finished rewiring my entire machine, and utilized a star point ground this time.
All electrical noise 'seems' to be eliminated. I can set the debounce at zero, and nothing triggers.
(although my limit switches are slow to respond, and require 500u secs to not trigger when homing)

I've done continuity tests on all three sets of limits(x,y,z), and all (manual) tests are correct.

X+ X- and Z+ Z- operate correctly, Y- works correctly, but Y+ does not trigger at all (manually it does)
Through Mach3 diagnostic screen, I can see the limits activate as i test them. Y- will blink randomly when held down, and Y+ not at all.
Again, manual tests with a multi meter, tests both Y+ and Y- as working right.

My Probe on Z seems to do the same thing. When Probing for Z hight, it triggers in the air at random points, but tests correctly manualy.

Hope this all makes sense (at least in the description) cuz in real life, I'm baffled and cant locate the issue on this one.
This weekend, I'll be rewiring the probe and Y limits, with the hopes it is somehow faulty switches.
But maybe its the C10 BOB?

P.S. I use mechanical switches and would like to upgrade/improve the timing/functions of them and looking for options.

I also use a C10 BOB, and wouldn't mind upgrading that too. ESS is on the horizon, but cost is a factor at this time.
I'd like to get away from the PP all together and just get a full motion controller.

Offline Mogal

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Re: Limit switch and probe trouble shooting.
« Reply #1 on: April 08, 2016, 12:28:49 AM »
uhg... A bum limit switch... so frustrating...

Offline Tweakie.CNC

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Re: Limit switch and probe trouble shooting.
« Reply #2 on: April 08, 2016, 01:57:31 AM »
Just when you think it is safe to go back into the water.  :)

Seriously though, I am pleased that you are making progress with this.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.

Offline Mogal

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Re: Limit switch and probe trouble shooting.
« Reply #3 on: April 08, 2016, 06:41:15 PM »
Well, I "THINK" everything is back in order, still doing some tests.

Turns out I had a bad limit switch that grounded out through the mounting screws...
That caused 5v power going to the framework of the machine, which in turn caused the probe to act sporadically.

So now that the limit switch is fixed, everything is working as it should.
I'm back to a ZERO debounce without any triggers :) even when homing!

HAPPY HAPPY HAPPY LOL

Offline Mogal

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Re: Limit switch and probe trouble shooting.
« Reply #4 on: April 09, 2016, 01:17:39 AM »
Okay, I think I got it.
just tweaking down my steps per inch.

I ran a 3 hour code tonight, and not a single error!
and when clicking "VERIFY" in mach3 after the code, all axis returned <0.0005"

Very happy with that.

My only issue I have now is the frequency of the parallel port. Its at 23,380hrz
So everything is 'slow'... setting a speed of 172ipm returns 160ipm.

but if its going to run error free now, I'm okay with that!  ;D