Re: Proximity Sensors and Mach3
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Someone please correct me if I have this wrong....
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Soft limits are only good if your machine never loses steps.
Once that happens in one directions the machine will stop before the crash
(a good thing) but if the machine has
lost steps and is ahead of where the software thinks it is then there will
be a crash going in the other direction if it goes far enough.
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IE: If the machine loses steps in the Y direction and thinks it is at say Y
20 when it has lost steps and is really only at Y 15.
Then if the software sends the machine to Y 3? And the soft limit is
set at Y 0 then because of the lost steps the machine will
go past the soft limit and end up at Y -5 and the soft limit will not stop
the machine until the software gets
to Y 0 and the machine will crash at Y 5 (because that is its new Y 0
location)
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With that said, I don’t think one should rely only on soft limits as a way
to keep their machine from crashing.
I don’t use limit switches on my machines nor do I use soft limits because
they will only help in one direction if my machine loses steps.
So I do all I can to make sure my machine keeps in step and I always run a
new cut file standing next to the Estop just in case I have an error
in the new code.
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Hope this helps.
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From: ronald_41 via Groups.Io
Sent: Wednesday, October 30, 2019 12:04 AM
Subject: Re: [MachCNC] Proximity Sensors and Mach3
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Thank
You for that analogy as I can at least understand it in the basic sense. I am
terrified of the idea that any screw up on my part will render a $500 CNC
Controller useless. I've been asked numerous times why I even bother with this
whole idea of running Home Switches when Soft Limits will do exactly what it is
that I am looking for without any of these issues. The problem with that way of
thinking is that I have yet to see anyone explain the proper way of setting up
Safe Z. If a person like myself could grasp the concept without prejudice from
others I would definitely go in that direction.
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