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limit swith vibration
« on: December 26, 2015, 11:19:04 AM »
My limit switch's work as they are supposed to , my problem is when my spindle runs into a knot or heavy cutting ( wood router machine ) the vibration trips a limit switch . Usually the Z or Y switch , my question is , can I have the homing switched back off more , so they are not on the brink of tripping , and thus not trip when there is a little more vibration.

   Thanks

    Ed

Offline Tweakie.CNC

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Re: limit swith vibration
« Reply #1 on: December 26, 2015, 11:51:46 AM »
I think you really need to replace the switches with a type that is more robust (Honeywell perhaps ?).
Although it may mean a fair bit of work, replacing the mechanical switches with solid state proximity switches may something worth considering.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: limit swith vibration
« Reply #2 on: December 26, 2015, 04:16:14 PM »
Switches that are used to establish a 0 position must open with a very small amount of travel, otherwise your 0 will be all over the place. Limit switches are often snap action so they don't vibrate open, but they won't be accurate.  So a switch that is accurate and vibration resistant is a bit tough to do.  Do you actually home your machine or just pick up coordinates for a part and go?
Re: limit swith vibration
« Reply #3 on: December 27, 2015, 05:44:44 AM »
Switches that are used to establish a 0 position must open with a very small amount of travel

I always believed that the repeatability of the switching point was the important bit and not the travel but I'm always keen to learn, can only short travel switches provide repeatability? 
Re: limit swith vibration
« Reply #4 on: December 27, 2015, 03:10:11 PM »
You are of course right, but it is really difficult to build a switch with a long travel and accurate activation point. So they tend towards being one or the other, not both.
Re: limit swith vibration
« Reply #5 on: December 29, 2015, 06:14:33 PM »
Hi  Ed,  I had a similar issue but it was not vibration directly causing a switch to trigger - it was vibration setting up noise in the line that was picked up by Mach.  I adjusted the sensitivity in Mach.  I set debounce interval to 1000 and Index debounce to 4.  Solved it.  Maybe you have the same?