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Messages - xpozec

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General Mach Discussion / Re: Light curtain implementation
« on: November 06, 2018, 06:46:56 AM »
I am back with an update,

Figured it is not smart to do feed hold, but decided to go with E stop.
So i did some adjustment to the electronics, set it up in a way that light curtain is always active, however only when machine is working is E stop in play,
the way i did it is, used one of the outputs from BOB to activate AND part of the solution.
Used Flood relay to activate AND part and adjusted PP accordingly.
Problem i have now is, when E stop is activated, it turns off MIST/FLOD relays, is it possible to prevent this in any way?
Basically is it possible, to set up program when E stop is activated one of the outputs remains in a last state: if off than off; if on than on;

I did some googleing, and found someone asking the same question, but when i use the link, it redirects me to index page of the forum
Any help would be greatly appreciated, thanks in advance
Also when it is ready, i will post the video of machine working, not too many STUD welders in video section.


General Mach Discussion / Re: Light curtain implementation
« on: October 24, 2018, 02:32:55 AM »
Thank you for the response.
I did check already, in order to better understand what i am attempting let me make a small diagram of parts, and try to show you why i need movement stop and not power disconnect:


i forgot to mention this is a rather small table top CNC
so powering it down would be overkill, it is positioned on a desk that is pushed against the wall on the back side, but i hope diagram will explain better, and yes it was made in paint :D
i am one of those people ;)

Thanks in advance

General Mach Discussion / Light curtain implementation
« on: October 23, 2018, 04:19:28 PM »

Long time reader, first time posting, or asking to be precise.
I have learned so much on this forum, so i want to first and foremost thank you all for all the great discussions, and all the enthusiasm you guys have.
It is a great community and i am glad to become an official part of it.
Now on to the problem at hand.
I recently did a stud welder modification (still in progress) and i am asked to install a light curtain, machine already came with device SICK - FGS 300.
Long story short i need some assistance in setting up a stop, other than E-stop, i know how to implement E-stop but reseting each time after changing work piece would just be tedious,
on the other hand i need machine to stop movement, when light beam is interrupted.
In all honesty i have no idea how to approach this problem, on my parallel port breakout board i have 1 empty input, but i am not sure how to set the MACH3 to stop or prevent motors from movement, and also possibly prevent feed to proceed so DRO is correct.
I did search on the forum, and only found partial answer and it was hard to understand.
So if someone has any ideas, or helpful suggestions, i would be grateful


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