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Offline dude1

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need help
« on: October 24, 2012, 04:58:50 PM »
need help getting home switches to work
the machine moves to the home switch in say z then move to y home but does not back of switches z and x are connected together. what it is doing is going to switch and stopping not backing of as it does with my other machine.
i have reinstalled mach3, reinstalled screen set, added diodes in to make sure i get clean signals
help please

Offline Hood

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Re: need help
« Reply #1 on: October 24, 2012, 05:19:40 PM »
Do the machine coords go to 0?
Does the LED at the side of the DRO go green?
Does the Reset start flashing?
Hood

Offline dude1

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Re: need help
« Reply #2 on: October 24, 2012, 05:32:02 PM »
machine coords go 0, led green, reset does not start flashing its doing everything but not backing off on diagnostics screen the home switch led is flashing on and off it could be backing off but not far enough. its no a very big machine

Offline Hood

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Re: need help
« Reply #3 on: October 24, 2012, 05:35:34 PM »
It is backing off if the LED goes green and the DROs zero. I would guess your problem is your switches are  not snap action and thus are bouncing. You could try and use some debounce interval, its on General Config, try 2000 but really the best option is to get good quality switches.
Hood

Offline dude1

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Re: need help
« Reply #4 on: October 24, 2012, 05:40:41 PM »
they are hall effect switches made the same as the ones on cnczone

Offline Hood

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Re: need help
« Reply #5 on: October 24, 2012, 05:42:27 PM »
Try the debounce and see if it works.
Hood

Offline dude1

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Re: need help
« Reply #6 on: October 26, 2012, 09:13:35 PM »
tried denounce did not help
my home switches are doing what they are meant to do but no back off.
when trying to get to work properly z moved up zeroed ,y axis moved to home zeroed and backed off once, x went home zeroed no back off. then tried it again all axis move to home and zeroed but still not backing off.
help

Offline Hood

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Re: need help
« Reply #7 on: October 27, 2012, 04:03:47 AM »
Ok your switches are basically suffering from  the electronic equivalent of bouncing mechanical switches.
As the machine Coords zero and LEDs turn green that proves Mach has seen the switches close again so Mach is working correctly. I do not know what your switches are like but it could be your axis is unsteady, the trigger is not precise enough or just these type of switches are not suitable for homing correctly.
Hood

Offline dude1

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Re: need help
« Reply #8 on: October 27, 2012, 07:05:20 PM »
they move off a little bit now but still triggering, i have the same switches on anther machine they work good as. theres a noise issue with the machine that is probably what the problem is just gotta find it. the machine is a 1200mm x 2400mm gantry router made in china

Offline Hood

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Re: need help
« Reply #9 on: October 28, 2012, 04:56:54 AM »
If they are only flickering on/off when the axis are at their respective home positions  then it would seem to me that the triggering is unstable (bouncing), if they are flickering on/off all the time then it would be noise. However if the latter was the case then Mach would likely see the home signals as soon as you told it to look for them, by homing, and the axis would not move much, if any, before home was set so I think the unstable triggering is the more likely.
Hood