Please Help me before I find Hammer

[Steve-m]

Hi Guys

Help Finally got plasma running working great apart from the last 20mm where the cutter turns off, I have tried on 5 or 6 different bits any ideas why please

retired maintenance fitter Im good with things i can hit with hammer or poke with screwdriver, or even electric glue together but software drives me nuts just cant get head around it

Thanks Guys

Acad 2002 drawings
Sheetcam Post
home made cnc running mach3
NVUM v2 bob

[Clive S]

Has the air pressure dropped too low as that could make it shut off ?

[Steve-m]

No no matter how big the piece i cut, cut always ends up 16mm short of start

[m_c]

What M-codes are you using to activate/deactivate the plasma? M3/M5?

Also, what happens if you change the feedrate?

[Steve-m]

What M-codes are you using to activate/deactivate the plasma? M3/M5?

Also, what happens if you change the feedrate?

tail end of code in picture

will try today to increase feed rate, strange when watching machine speed seems fine but when watching video its so slow to other videos ive wached


Cheers
Steve

[JAZZCNC]

It looks like the Z-axis is lifting before the end of the cut so you are losing the arc.?
Do you have THC.?

Post the code so can see it and I will try on our Plasma.

Yes, it's far too slow but that's not the issue.

[Steve-m]

It looks like the Z-axis is lifting before the end of the cut so you are losing the arc.?
Do you have THC.?

Post the code so can see it and I will try on our Plasma.

Yes, it's far too slow but that's not the issue.

Thank you will post in morning its in shed, Im so happy it even moves and cuts but will increase speed, sheetcam is all new to me old head dosnt like taking in new stuff

No THC just a floating Z

[Steve-m]

It looks like the Z-axis is lifting before the end of the cut so you are losing the arc.?
Do you have THC.?

Post the code so can see it and I will try on our Plasma.

Yes, it's far too slow but that's not the issue.

Tried at 2000mm min double speed and cut ended at 38mm before start

gcode from previous 1000mm min run if i can work out how to post eill email it to you


cheers

[Steve-m]

It looks like the Z-axis is lifting before the end of the cut so you are losing the arc.?
Do you have THC.?

Post the code so can see it and I will try on our Plasma.

Yes, it's far too slow but that's not the issue.

Tried at 2000mm min double speed and cut ended at 38mm before start

gcode from previous 1000mm min run if i can work out how to post eill email it to you


cheers

[Steve-m]

here is a video of running at 2000mm min cut ends 36mm short of start

https://youtu.be/uNewULWj054