plasma not cutting good

[mvandijk]

I have some issues that the plasma cutter not getting every line to cut see the picture with the M
The picture with the 3 cirkels are good that i have cut before i try to cut the M out
i have change nothing else

I'm using a proma thc sd controller and my sheetcam setting for the z axis i use are
pierce height 1.5 mm
plunge rate 1000 mm/min
cut heigt 1 mm

i think its is the z axis is to high but if lower the setting in sheetcam nothing wil change

how can i change it to get lower

[Robertspark]

Change the voltage setting in the proma SD and the cut height will change,

Higher voltage setting, more gap between material and torch
Lower voltage setting , less gap between material and torch

The z height in sheetcam is just the initial setting for the cut height, once the proma detects voltage it will start adjusting the z axis without any involvement from sheetcam or uccnc.

Can you provide a section of gcode please

[Robertspark]

There is also no feedback from the proma SD (no ARC OK signal), so I suspect that the torch is misfiring, but the gcode is just running on.

[mvandijk]

The gcode is not the problem it is the misfiring from the torch to the material the gap between is on some please to big

I try tomorrow to lower the voltage off the proma sd i let you know if it help.

[cncdrive]

Probably the setpoint on the Proma is not correct for that cutting and so it pushes the torch up to too high and so the arc getting lost.
And as Rob said because the Proma SD is ment to be a standalone THC controller it does not give an ARCOK signal to the CNC control software so the movement continues eventhough the arc was lost.
The Proma THC 150 is a better choice for the UCCNC, because it outputs ARCOK signal and it also lets the UCCNC to control the Z-axis for the THC.

[mvandijk]

I lower the voltage of the proma sd its now cutting better.