My custom Post Processor does not have an "unrewind" feature. Looking for support to be added

[CriticalInnovations]

I have a custom 4th axis post processor and I am looking to do a multi axis rotary machining and when I post the process I can an error that reads, "REWIND: Rewind of machine is required for simultaneous multi-axis toolpath and has been disabled."

I have searched through the .nc program and it doesn't appear to have any where to make this statement (True) 

I believe it may need to be added, but I don't know where to add it in the script. Please assist.

I have attached my Post Processor.

[Arun.rs]

Hi @CriticalInnovations 

Thanks for raising your concern via Forum.

Mostly the 4 axis machines allows the cyclic motion, it doesn't need to be retract and reconfigure.

Change this: 

var aAxis = createAxis({coordinate:0, table:false, axis:[0, 1, 0], range:[-360, 360], preference:1});

To This:

var aAxis = createAxis({coordinate:0, table:false, axis:[0, 1, 0], cycle:true, preference:1});

Save the file and test NC output carefully.

Regards

[CriticalInnovations]

thank you,

I just tried this and the z axis is going around the part and ends up down to the bottom of the part while the rotary is spinning. Hope that makes sense.

Seems like the z touch point would stay at the top center while the rotary turns the part.

[Laurens-3DTechDraw]

Have you done any 4-axis simultaneous moves before this?

Has that worked?

[CriticalInnovations]

I have not done 4th simultaneous before this. I was doing conventional 4th.

[Laurens-3DTechDraw]

Alright,

Than I think it makes sense.

For 4-axis simultaneous moves the post processor seems to output coordinates in TCP mode.

Does your control have the TCP function??

If the control does not have a TCP function changing this line:

optimizeMachineAngles2(0); // TCP mode

to

optimizeMachineAngles2(1); // TCP DISABLED

 Could help.

[CriticalInnovations]

This unfortunately did not work. 

[Laurens-3DTechDraw]

We need a bit more info than that to help asses what's going on.