Fusion 360 Multi-Axis Post Error

[timWNK2X]

I am trying out multi-axis contouring, for the first time, to deburr some holes and my post keeps erroring out.  Here is what posts out:

Information: Configuration: HAAS Trunnion (pre-NGC)
Information: Vendor: Haas Automation

Information: Total number of warnings: 13
Error: Failed to post process. See below for details.
...
Code page changed to '1252 (ANSI - Latin I)'
Start time: Thursday, April 12, 2018 3:00:25 PM
Code page changed to '20127 (US-ASCII)'
Post processor engine: 4.2.1 41684
Configuration path: C:\Users\AppData\Roaming\Autodesk\Fusion 360 CAM\Posts\haas trunnion negative a.cps
Include paths: C:\Users\AppData\Roaming\Autodesk\Fusion 360 CAM\Posts
Configuration modification date: Friday, February 9, 2018 4:29:09 PM
Checksum of intermediate NC data: a475a30108378f4fcac396d9a0d05ebc
Checksum of configuration: b1302526d72ab17f459f7b138bef09f3
Vendor url: https://www.haascnc.com
Legal: Copyright (C) 2012-2017 by Autodesk, Inc.
Generated by: Fusion 360 CAM 2.0.3803
...
Warning: Work offset has not been specified. Using G54 as WCS.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Warning: Tool number exceeds maximum value.
Error: REWIND: Rewind of machine is required for simultaneous multi-axis toolpath and has been disabled.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: Failed to invoke function 'onRewindMachine'.
Error: Failed to invoke 'onRewindMachine' in the post configuration.
Error: Failed to execute configuration.
Stop time: Thursday, April 12, 2018 3:00:26 PM
Post processing failed.

I have no idea how to correct this.  I have tried changing tilt angles, sweep, a variety of things and it fails to post every time.  I have attached the f3d file to have a look at the mess I have made.  If anyone has any clue how to rectify this I would be greatful of any assistance.

Tim

[Laurens-3DTechDraw · Accepted solution]

This is because the toolpath runs into the maximum of the rotary limits.

It can work around this by what we call the rewind Logic. That means if it runs into the -30 limit of the A-Axis it will retract the tool, move the A-axis to 30. (Flip the B or C-axis 180 degrees as well) and come back in.

Not sure on your post, but in the latest Haas with trunnion post this is built in but needs activation:

Find the latest post here: http://cam.autodesk.com/posts/?p=haas_trunnion

You need to change this:

// Start of onRewindMachine logic
/***** Be sure to add 'safeRetractDistance' to post properties. *****/
var performRewinds = false; // enables the onRewindMachine logic

To this:

// Start of onRewindMachine logic
/***** Be sure to add 'safeRetractDistance' to post properties. *****/
var performRewinds = true; // enables the onRewindMachine logic

[timWNK2X]

Sorry for not replying eons ago!  I have not had to run anything requiring rewind since the last part, and I just changed my toolpath, on the original job, to get around it.  I am running a new part now requiring rewind and it seems to be doing a weird linking move not shown in the simulation.  When the program gets to the part requiring the rewind and saferetract, it wants to move to the center, negative y, and it is burying my cutter into the material before it retracts.  Do you happen to know why this is and can it be avoided?

Tim

[5X-machines]

@Laurens-3DTechDraw

I cam across the same error with multi-axis contour and followed the steps you outlined which did fix it failing to post.

However, I do not know why it needed rewind in the first place because when I run it on the machine it does not even come close to the machine limits before doing a rewind move. Do you know what might be a work around to avoid having pointless rewind moves?

Thanks,

[Laurens-3DTechDraw]

---

@5X-machines wrote:

@Laurens-3DTechDraw

I cam across the same error with multi-axis contour and followed the steps you outlined which did fix it failing to post.

However, I do not know why it needed rewind in the first place because when I run it on the machine it does not even come close to the machine limits before doing a rewind move. Do you know what might be a work around to avoid having pointless rewind moves?

Thanks,

---

It is possible on the Haas machines you run into the C-axis encoder limit.

Not sure if that is the case here but it might.

If that is not the issue the more info(Part&post preferably) you can share the easier it is to diagnose.

[5X-machines]

@Laurens-3DTechDraw

Thanks for the help. I did some more digging into the post and discovered it incorrectly set the machine limits which is why I was getting the rewind.

I am using the UMC750 post which by default has the B-axis limited from 0 to 110 instead of the machine's actual limits of -35 to 110. I altered the post and am now good to go!