My sizes are out

[JAZZCNC]

Well a quick look shows that it should cut a 50mm pocket. The last move is at 43.65 and the tool 12.7mm so should hit 50mm provided the tool really is 12.7mm

[Doddy]

Ignoring all the individual line segments...

X lower extreme = 6.35, higher extreme = 43.65. Tool size specified as 12.7mm (6.35 rad), defines a X range of 0..50mm - I guess the operation...

line 231:
G01 X43.650 Y6.350 Z-3.000
G01 X43.650 Y43.650 Z-3.000
G01 X6.350 Y43.650 Z-3.000
G01 X6.350 Y6.350 Z-3.000

is the finishing pass, and should leave a 50mm pocket. Provided that your cutter is 12.7mm diameter.

The code is right (at least that should leave the pocket at the correct size). I'd look to answer Jazz's question on measured tool size. Beyond that, looking at the input to the DDSCV controller (GCode) is correct, you have the configuration of the DDSCV itself that I cannot advise, and the output measured... I'd say the controller is looking suspicious.

[Doddy]

Hmmm, really basic question - you have measured backlash on the axis?

[JAZZCNC]

I'd say the controller is looking suspicious.

I'm not sure it is because it would show error in the distance between the other pockets. The only thing it could be is if it was applying any tool offsets and he says not.!

My money is on the tool being wrong.!

[Desertboy]

I just ran that code to make sure as I did just generate that code and also I just updated the firmware on the controller

[Doddy]

G-Code describes 50mm with a 12.7mm cutter. I reckon your machine is just plain haunted and we should all just self-isolate from it.

The bit that gets me is that it's a very precise 1mm error. But the G-Code is precise and correct.

[Desertboy]

I'm not sure it is because it would show error in the distance between the other pockets. The only thing it could be is if it was applying any tool offsets and he says not.!

My money is on the tool being wrong.!

I'm going to try doing a factory settings reset on the controller in case it's tool offset I'm missing, that I set by accident.

I thought updating the firmware would do that but it did not.

[Desertboy]

G-Code describes 50mm with a 12.7mm cutter. I reckon your machine is just plain haunted and we should all just self-isolate from it.

The bit that gets me is that it's a very precise 1mm error. But the G-Code is precise and correct.

It's always 1mm out

33mm hole was 32mm

99mm hole was 98mm.

[Doddy]

I'm adding noise now to this thread which I don't want to do but I understand (I think) where Jazz is coming from - it's unlikely to be a tool offset or deliberate behaviour by the controller simply because the controller doesn't understand the geometry of the shape being cut - that's part of the CAM to apply the tool diameter offset performed by Fusion depending on the face being machined.

The only thing I can see in the manual are the backlash parameters 437..445 (DS DDCSV V3.1) that would likely have such an impact on behaviour, but even that I'm doubting as it is likely to introduce more steps, rather than reduce.

[JAZZCNC]

I'm adding noise now to this thread which I don't want to do but I understand (I think) where Jazz is coming from -

No No No don't go complicating shit with that it's too consistent to be noise. It would be random and happening all over the place if it was noise.

Still haven't had an answer to if the tool has been measured.?