Overcut support on CandCNC Ethercut

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whiskeymike
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Re: Overcut support on CandCNC Ethercut

Post by whiskeymike »

Thanks guys for the update. Would you guys mind posting a couple pics of where/what you jumped?
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acourtjester
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Re: Overcut support on CandCNC Ethercut

Post by acourtjester »

Here is how I did mine. :D
arc ok switch (1).JPG
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exapprentice
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Re: Overcut support on CandCNC Ethercut

Post by exapprentice »

Hi whiskeymike

the switch is a simple on/off toggle switch.
the wires from the switch go directly into the same terminals that are on the PWM for:
"ARC OK (TRANSFER)"
The original wires used by DTHC stay in place as well as the new wires from the switch (bottom right in picture)

I use it all the time on thinner materials, works a treat,
I turn the switch off when I have a delay programmed in from SheetCam ;) and it works as normal sensing the arc.
Hopefully below is a picture of my set up (the additional red and black wires)
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DSC00393.JPG
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Diesel
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Re: Overcut support on CandCNC Ethercut

Post by Diesel »

This evening, I've experimented with entering a negative value in SheetCam's "Overcut" field in an attempt to achieve what Jim said above (..."leaving a gap at the end of a circle (before 360 degrees)").

I haven't nailed it yet, but the results are quite promising.
This method allows you to leave the CAD files unchanged and has a very similar effect on the divots as the M10/11 "torch off early" commands.

Note: the value shown here is exaggerated for demonstrative purposes.

-Matt
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SheetCam_NegativeOvercut_2.jpg
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SheetCam_NegativeOvercut.jpg
SheetCam_NegativeOvercut.jpg (2.48 KiB) Viewed 1128 times
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Re: Overcut support on CandCNC Ethercut

Post by motoguy »

Thanks for mentioning this! I'll give this a try tomorrow and see how it works.
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Re: Overcut support on CandCNC Ethercut

Post by Drgoogs »

exapprentice wrote: Sat Oct 17, 2015 12:29 pm Hi everyone

following on from Toms suggestions above, I did "Jumper" across the "Arc OK" on the CandCNC PWM module and the divot at the pierce is noticeably smaller almost to the point of nearly gone, I have now cut more than a few open lines in the 0.9mm sheet of material and I am pleased so far with the quality of the cuts on open lines :D

I have now replaced the "jumper with a switch wired across the Arc OK terminals of the PWM, this way I can decide when and on what thickness materials I want to use it on ;)

as I have already mentioned in an earlier post I don't think the divot issue is as pronounced on thicker materials and shouldn't be an issue if you are using lead in and lead outs on closed shapes.

I would recommend this tweak especially on open lines and the thinner materials, thanks again to Tom for chipping in and making his suggestions.
I will carry on testing and post back again :roll:

If anyone does get around to trying this out, please add your results to this topic for all to share :!:

Best regards to all and thank you
exapprentice
I found your post and looked in my Avid CNC Control box and found the ARC OK wires nicely labeled. I will be wiring up a switch parallel to that connection in the next day or so and give it a try. from your photos and comments it looks very successful. thank you so much for your help!

Happy Holidays!
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exapprentice
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Re: Overcut support on CandCNC Ethercut

Post by exapprentice »

Hi David
Hope you get it dialled in and sort out your divot problem
Have a great day
Best Regards to all
Exapprentice :D
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