Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Dan Cook on January 20, 2024, 03:44:29 PM
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when I go REF ALL my Z axis will home, then offset itself, (WHICH IS NORMAL) BUT then it goes back very slowly and bounce off my homing/limit switch a 2nd time setting off my reset button and turning on my DRO to green. On my diagnostic page it show all LED lights on limit switches on. When I activate a limit switch in DIAGNOSTICS all the lights go out on my limit lights and all my homing LED lights go on. I can stop my machine using my limit/homing switches and reset them. Im operating my limit/homing switches NC so if any switch was bad I shouldn't be able to reset my system
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What type of switches are you using?
Do you have power wires mixed in with the home switch wires?
Are you using shielded cable for the home switches?
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Im using 2 strand shielded wire.and wired it up NC. I did have it running and homing. . I did something today and pulled off one wire on my x axis switche and it was still able to run until I went to put it back on. I had to reset Mach3. If I just hit the limit / home switch it will stop showing limit switch triggered. I would think that the machine would stop once the circuit was broken. Only when I trip th limit switch will it stop. Im using small black switches with the trigger is on the side. Im about ready ro replace all th switches. I would think that since the switches can be reset than the homing should work as well. Only z homes
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Turn off the limit switch signals in ports and pins and see what happens when you just have the home switches enabled.
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I disabled all my limit switches in ports and pins and it didn't make any change. z axis still homes twice. once travels to the switch and off sets, and then inches up hits the limit/home switch and off sets again and then shuts down Mach3 to be reset again
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Actually I went to diagnostics and found only on limit switch I didn't disable. when I disabled it all axis DID home.
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all axis switches home by bouncing off of the switch 2 times. they hit the switch and offsets, then very slowly goes back and bounces. off the switch a 2nd time.
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That sounds to be working okay now. I would forget about the limit switches and set up the softlimits. Homing works in different ways depending on the controller used.
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would you know why when it homes it would hit each stop twice . on the first contact it offset only to creep extremely slow to make a 2nd contact and off set again. also I would like to adjust the off set and it seems that when I go to homing/ limits and adjust the offset it doesn't seem to make a difference it the amount of off set. my Y axis off sets about 1/16 of an inch just enough to hear the click of the switch
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Homing is controlled by the motion card, some use a fast approach and then back off to allow a slow accurate position, large machines need this more than small ones. Some plugins have an option to turn on/off accurate homing.
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AHH got it Ido have a larger machine. After the first home activation the drift back to th e Limit/home switch is so subtle that I questioned its doing. Thank you so much for your help. I wish I could activate my limit switches for an extra bit of insurance, but like you said if my soft limits and homing are working I really don't need the Limit switches.
They did work at on time button well. Thanks again