Floating Head TNG.

[MrEmo]

This g-code is correct and behaves exactly like it should. Post is correct.
If behavior is like you described then you don't have machine correctly configured and/or you don't know how to use it.

The code is correct. But your measure height script is not.

Everything is setup the way it should yet it is not working as it should.

[PlanetCNC]

Then tell me what is wrong with it?

It does exactly that it should. It probes in Z- direction until it gets signal. Sensor Z setting is used to adjust this measurement to fit your floating head. Then it returns to correct height.

Your Sensor Z setting is zero which is kind of odd. But you claim that your settings are correct and that there are other reasons that this does not work.

[MrEmo]

Then tell me what is wrong with it?

It does exactly that it should. It probes in Z- direction until it gets signal. Sensor Z setting is used to adjust this measurement to fit your floating head. Then it returns to correct height.

Your Sensor Z setting is zero which is kind of odd. But you claim that your settings are correct and that there are other reasons that this does not work.

Right now I have no idea what is happening. The measure work height script worked good last week. But now I'm getting all sort of weird values.

I followed the blog you have on your site on measure work height. But now I am not getting it to work properly.

My Z size is -1.6mm that is the height it takes from Z to touch material until the switch is triggered.

I have now measured height to be exactly 10mm and 20mm. In which I can slide a 10mm part beneath Z axis. When I now use measure height I get 12.580mm instead of 10.

When I measure with part 10 and 20mm I can move Z from 10 to 20 and two parts of 10mm fits beneath. So steps per unit is ok.

[MrEmo]

Ok.

Remeasured Z and for some reason the correct value is -4.6mm. So random height is more or less gone.

Now I am back to running your post processor. G code is correct. I am not sure if I should add any more settings or if measure height setup is the only one.

I will be back with more info. Don't have more time today to work on these issues.

[MrEmo]

Then tell me what is wrong with it?

It does exactly that it should. It probes in Z- direction until it gets signal. Sensor Z setting is used to adjust this measurement to fit your floating head. Then it returns to correct height.

Your Sensor Z setting is zero which is kind of odd. But you claim that your settings are correct and that there are other reasons that this does not work.

M08 (Before end)
G03 X30.3569 Y821.6324 I13.5989 J-4.2582
G01 X30.3569 Y817.9567
G01 X30.3569 Y815.9567
(Part: Copy of Flat pattern - Del1 v1.3)
(Filename: 5MM Braketter 26.04 2.tap)
(Post processor: PlanetCNC Plasma THC - Mult part.scpost)
(Date: 28/04/2021)
G21 G90 G91.1 G94 G49
G00 Z15.0000
M54 P0
M05
G04 P0.3
G00 Z15.0000
G00 X234.2147 Y926.4355

Snipped from your code.

After the part is finished it does not send command M05 til after it has sent :
G21 G90 G91.1 G94 G49
G00 Z15.0000
M54 P0

Which means that the torch goes to Z15 before it turns off the torch.

Any quick fix to this?

[PlanetCNC]

Looks like this is SheetCAM bug. It starts new part before last one is finished.

[PlanetCNC]

Check if this workaround works

[MrEmo]

Check if this workaround works

I made my own workaround since I had to get the machine up and running.

There was apparantly something wrong with the Z axis floating head. The switch was 1.6mm but it broke down so the updated measurement was 4.6mm.

I have now fixed this again so it's back to 1.6mm.


But. If you look at the other picture I posted you can see that the parts in the program and where it shows it has run in the program are different?

Also it randomly tried to cut 3 parts ontop of eachother. I have no idea why, and in the program in the picture it says the parts where cut at the "correct" place.


I managed to recreate this later on in the program where it did this again. I stopped the cutting to remove some ready parts. And when I started it up where it left of it started cutting way off where it was supposed to be so it wrecked that piece.


Also the machine now does not stop if I trigger the limit switches. It just continues to run. With the cutting in progress and when I use the pendant to move the machine around. Would you happen to know why this might occur?

Thanks. A lot of weird problems for some reason.

[MrEmo]

Check if this workaround works

I'm having some issues with the floating head again.

It seems like it registers the "floating head" as machine position instead of work position? So the values Work/Machine becomes different.

This becomes problematic since the work and machine becomes very much different at one point. I'm not quite sure why but the machine then dives the z into the plate and does not stop at the limit etc.

Did you see my last post in regards to machine not stopping if I engage limits while it running?

[PlanetCNC]

1.Floating head measures tool offset, not work offset. There is no reason to set work offset in Z direction.
2. You either disabled "EStp" on limit switches or you disabled "Hard Limits"

[MrEmo]

1.Floating head measures tool offset, not work offset. There is no reason to set work offset in Z direction.
2. You either disabled "EStp" on limit switches or you disabled "Hard Limits"

1. Ok. Can you explain to me how exactly the settings should be with a 1.6mm switch? It's not working exactly as it should now.

I added some photos again. It finished the part at the end of the line and went on to start a new part. Then you see the 10.315mm measurement on Z axis. This is after the "measure" call. Then I did the measure work height and it really came out to 11.845 which is 1.5mm more than it should.

Hopefully there is a easy solution to this as I have burnt up 150$ of consumables cutting 1 sheet today.


2. Estop was active. The hard limits was disabled for some reason. Must have been the back and forth between profiles I was sending you and testing.