Ok,
I have been VERY slow getting my mill up and running due to my day job in the Military. That being said I had a bad servo which Langmuir was good to sort out and ship me a new one. Then I was deplaoyed so now I am trying to square and setup my limit switches after upgrading to the cooland proof ones. First Home machine crashed the Z axis. I noticed the little rocker bar had snapped off.
I replaced it with one of the ones that I took off after the upgrade. and still no good. So I removed the limit harness and started probing to make sure I didn’t have a broken connection.
Premise all switches are normally closed (tested each one)
Y1 Red = Pin 3 Black = Pin 1 ( Pin 3 = Limit 2 on control board and Yellow wire)
Y2 Red = Pin 4 Black = Pin 1 (Pin 4 = Limit 3 on control Board Purple Wire)
X Red = Pin 2 Black = Pin 1 (Pin 1 = +5 V on control board Red Wire, Pin 2 = Limit 1 on control Board Blue Wire)
Z Red = Pin 1???/ WHAT Black = Pin 1
I can’t see how this can be, I tested it three times. Anyone with any insight?
The Z limit switch does not utilize a lever, whereas the Y and X switches do. If my memory serves me correctly.
Thanks for your service to this country, my friend.
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As @Bigdaddy2166 said the Z does not use a lever. It probably crashed due to the switch being a little too high up/ hard stop being too far down. I remember while building my machine the Z homing button was not in the correct position and had to unscrew it a tinny bit and lower it. It still didn’t reach so I had to unscrew the hard end stop a tiny bit as well. Hope this helps. Also: X-Blue,Y1-Yellow, Y2/Z-Purple, 5V-Red. All pins get pulled down, open, to GND when closed.
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Ah, well that explains the missing bar, but not the failure of the limit function. Thanks.
Further investigation reveals that by design Y2 and Z limit switches are in series. I believe logically this should mean that the Red Wires for Z goes to the black wire on Y2. Y2 Red Wire to Pin 4 (Purple Wire Control Board Limit 3). The Black Wires for all Z, Y2, X should be joined together for Pin 1 (Red Wire Control Board +5V).
My harness appears to have a continuity problem between the Z and Y2 harness ends;
Disconnected this harness reads continuity between
Z R = Y2 B
Z B = Y2 B (This should not be joined to the others for Pin 1/+5V Ref) Y2 Should not have common connection to Y1/X/Z Black Wires but does. I believe this is the problem connection.
Y2 R = Pin 4
Unless my logic is failing me after looking at this for 12 hours, this means that my limit switch harness has a bad termination in it. I inspected the wires carefully for pinch marks indicating damage, but found none.
I guess the next step is to build a temporary patch harness to test my theory. I will talk to Langmuir support as well and see what they figure. I will report back once I know more.
Unless there is damage inside the enclosure, I believe the issue is likely at the aircraft-style plug. It’s hard to imagine the harness failing after the new limit switches were installed. I have Mercol switches, but my Z still uses the original factory switch. Good luck, and please keep us updated. Happy New Year again!
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This function Z Limit /Home was not tested yet in my setup until I installed the water proof limit switches. So I can not say whether it was working correctly or not prior to switching out the limits for the waterproof replacements from Langmuir. Happy new year to you as well!
Ok,
So I tested the system by disconnecting the Y2 Black Wire and connecting it to the Z Limit Switch Red Wire, and leaving the Red Wire on Y2 and the Black Wire on the Z Limit switches connected to the factory harness. Then I tested the system by manually pressing the Z Limit Switch Triggered the Y2/Z limit flag on Cut Control. Then cleared that and manually pressed Y2 Limit switch which did the same. Thereby confirming my theory that my Limit Switch harness has an incorrect connection inside the Moulded Junction that I can not test. Off to Langmuir I Suppose.
I have a hard time believing that I got both a bad Spindle Servo motor and a bad Limit Switch harness… But this does appear to be the case.
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