You can even setup User DRO's on the screen set to enter preset and pierce height etc. With this setup you don't run the risk of falling foul with offsets and can have much more flexabilty and control of what happens.
Sheetcam plasma setup plus#
Plus the other thing which can cause problems is that G92 only works with Absolute moves so any incremental moves will use the WORK coordinate offset. So even if you load another G-code file the previous offsets still apply if a G When you use G92 nothing moves it just defines a new Point which you then work from.
Work coordinate Zero can be anywhere on the Machine. No offsets are not cancelled with Ref all home this is one of the dangers with them. Yes will work and yes there are better ways. This can lead to unexpected movements and crashes.!! Now Cancel the Offset with G To be honest using coordinate offsets is not the best way to do it and can easily get you in trouble with other g-code files because they stay in affect if not cancelled.
First make sure any Offsets are cancelled by typing G Now type G92 z0 and you'll see the Z dro change to 0 now type G0 z5 which will simulate movement 5mm positive. If you cancel the Offset by using G Try it in MDI in simulation mode. What it's doing is using the probe to find the material surface and where ever that coordinate falls in the current WORK Coordinate system G54 then it sets an offset coordinate value. Ok well G92 is an Offset Coordinate from the exisiting coordinate point.
The post processor I have been looking at uses g31 z to drop the torch until the probe switch changes state, g92 z0. If you want it to do this you have to alter the Homing script. Also by default Mach homes each Axis individual one at a time when you press "Ref All Home" they won't all go at same time. It will also ignore the Probe input while homing but that shouldn't be a problem. Regards "home all" then Mach treats homing separate and just watches the assigned pin, by that I mean it will not watch limits etc unless specificly told to do so.
Sheetcam plasma setup code#
If your wanting proper THC in that it follows a set distance from the surface then that will probably be differant matter.? I have had a look inside the post code for the mach plasma with THC option in sheetcam and it has the code for G31 seeking so it just needs some options altering and the floating head switch wired to the probe input I think. This macro reference you then have SheetCam insert into the code it produces at the points it's needed. If all your wanting to achive is to probe the surface then retract to a set height along with zeroing DRO's etc then that's easy enough done but you'll need to either alter an existing Macro like M3 or create your own. I also need to find out about editing the sheetcam post file to insert the new code. I will start on building a floating head as it seems pretty essential and makes a lot of sense to me. I have found a couple of versions, one uses g The g31 version seems besta st it uses the switch connected to the mach probe input and apparently it can still allow "home all" to use the upper limit switch on the Z axis, this is exactly what I want. It would then set all the Dro's etc and pierce height etc from within the Macro. Is it just another limit switch? Or does it need a seperate input signal? Post the code because chances are it uses G31 and the Probe input.? It could also need a Macro.? Edit: To be honest this could easily be done just by modifieing the M3 Spindle on macro to use G31 command and the probe input.
Sheetcam plasma setup full version#
View Full Version : Plasma floating head Looking at adding a floating head to my new build, I've found some code that goes in sheetcam to be run before a cut, this lifts the head, drops it and zeros the DRO etc, what I can't find is where the signal from the floating head micro switch is fed into the mach3 system?
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