differential outcome between Cut2D and UCCNC ?

Tug - can you send files?
If the Cut2D || Gcode || UCCNC process has been working well then there is no reason for this and there must be some explanation for the geometry reduction.

can you send the files and we'll have a look?

also - do you mean the machined part measures 12mm difference? or the visual output on live view?

the view on the CCNC program showed the difference between two identical objects so I did not cut them. I reverted back to a single and did it twice, however there have been differences one from another on some of the files I did some time ago.
All these files are for a customer.
just take this one, copy/paste and move it across, then ask the Cut2D to save the Gcode I think you will find the do not come out the same.

wooooops sorry wrong file this one is the one I had problems with. sorry Rory

Tug
PS tried to copy paste and give it to you as I tried to use it but cannot save in recognised formate only crv so it will not upload.
Brian

Looks like the DXF is the culprit. When asked to go outside the vector Cut2D produces a toolpath inside also. See "Cut2D toolpath difference". It seems to be random also - copy and paste same vector and the second one doesn't work. Sometimes it does

This will result in lot geometry of twice the diameter of the tool in the Gcode file and therefore (correctly) in the UCCNC. See "UCCNC size difference"

So the lost geometry was coming from the Cut2D toolpath generator before the Gcode was generated. So the generated Gcode and resulting toolpath view in the UCCNC were in fact correct (if the issue you had is the same as the one seen here).

Try the cleaned up DXF and see does it go away - cleaned DXF works perfectly here (tug test file keel.dxf). its attached to this post (hopefully)

See also the working DXF copied and pasted 4 times without issue and the UCCNC showing what was in the CUt2D view.

how are you generating DXFs tug?

I was not generating, the files are from the customer, I think he's using CorelDraw I will ask.
How do I clean up the DFX, I have Coreldraw can I put it into this program and then save it under another formate ?

There are a number of settings when exporting. The top line / curve was the problem. There were a lot of points in it that were not needed - I just cleaned it up and re-drew the line and it was okay.

Try QCAD - you can download for free. its open source.

A possible solution is to open the DFX file from client in QCAD and then re-export as DXF from there and QCAD might do a better job than corel with the DXF data. There are settings there too when you export.

Thanks Rory your help is very much appreciated.

Tug