AXYZ 4010 ATC and AXYZ post processor issue

[natC6X6P]

Hello

I am fairly new to Fusion and CNC work and have encountered a problem with the post processor I have been using.

Certain files I have had no issue with but I have started finding that large arcs are being added to my NC files once I have put them through post process. Attached are images of the CAM model and how it looks on NC viewer when it's been posted.

The setup I am using:

AXYZ 4010 ATC cnc router

The post processor is the AXYZ one held in the Autodesk post library.

I have found two workarounds, one being a custom post processor I found on the forum here and another is to change some of the post properties such as Maximum Circular radius to 0.01 instead of whatever the default it sets is (often 1000 or greater). 

Is this an issue with the post processor or are there other settings I should be modifying before post?

Thanks in advance!

[serge.quiblier]

Hello @natC6X6P 

it 's not easy to give you a defintive answer.

1 - it can be a bad interpretation in NC Viewer, as the arc center can be (depending on controlerà either in absolute or relative mode.

2 - May be your controler doesn't support arc in plane other than XY.

3 - Do you have an error on the controler, or just this "bad" drawing in NC-viewer.

4 - Maybe we are not outputting all the necessary parameters (XY IJ in XYplane, ...) and the controler is unable to interpolate.

So if you have a manual describing the syntax for the arc interpolation, it will be useful.

Regards.

[natC6X6P]

Hi Serge 

Firstly, thank you for the quick reply.

It was an error on the controller of the CNC that alerted me to the problem in the first place. The CNC presented:

ERROR 303 – BOUNDARY ERROR MINUS Y

This error is generated if the machine is trying to move too far in the negative Y direction and the carriage will hit the minus Y stops. This error can occur if the NC file has minus Y commands and the machine origin is not moved far enough away from the Y stops. This is an operational or file creation error. There is no electrical or mechanical problem with the machine. Do not replace parts or service the machine.

To respond to your queries;

1 - What is absolute or relative mode? I recognise NC viewer may not be accurate but just gives a rough idea.

2 - The CNC is 3 axis so you could well be right, although the programs I have been running don't involve anything the machine shouldn't be able to do.

3 - See the error above.

4 - Is there a way I can investigate this/further information that you would need to look into this possibility?

Many thanks

[serge.quiblier]

Hello @natC6X6P 

Explanation on point 1:

when interpolation a circular move, the arc center is given to the machine via the I, J or K variables. (depending on the plane)

In absolute mode the I, J , K values are mesured from the wcs used for machine.

In relative mode, the IJK values are expressed as an offset from the start of the arc, being expressed incrementally from the start point.

If you have a programming manual for the controler or the machine, the parameters XYZ, IJK can either be mandatory on the line, or they can be considered as modal. (when modal, we don't output parameters, if the value is not changing from one line to another)

Last thing sometime controler accpet that a I0, J0 or K0 value can be ignored and not outputted.

As the informations I have about this controller is just a 2 pages list of commands, there is no extensive informations.

Cheers.

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