Hi team,
I'm using Fusion 360 with a Siemens 808D-controlled Optimill F80TC milling machine, and I'm encountering a "Error in end point of circle" message on the controller. This occurs consistently when the toolpath reaches the "Blend1" operation in my setup.
Details:
Post processor: Siemens SINUMERIK 808D (attached)
Controller: Siemens 808D
Fusion CAM version: 2603.1.15
Post engine: 5.294.0
Problematic operation: Blend1 (T10, 2:02 duration), shown in attached screenshot
Issue file: Swingarm LHS OP1 ERROR.mpf
The file simulates correctly in Fusion 360 and also runs fine in NC Viewer. The error only occurs at the machine. From what I've read in similar forum threads, this issue usually relates to strict arc endpoint tolerance, full-circle arc generation, or formatting issues (such as IJK vs R format).
What I've tried:
Modifying the post to linearize arcs using helper methods like linearize(), linearizeArc(), getCircularPoints(), etc.
Forcing G1 output using manual overrides
Using setCodeOutputMode(CodeOutputMode.NO_ARCS) (which is also undefined in this post engine)
None of these worked due to limitations in the post processor engine or missing functions
Request:
Can you help modify or update this post processor to either:
Fully linearize arcs into G1 segments (in a compatible way for the 808D), or
Output arcs in a format that works reliably on Siemens 808D, such as using R values only with shorter arc sweeps?
Attached:
Fusion 360 project file (.f3z)
Original .cps post file
The problematic .mpf file
Screenshot showing Blend1 highlighted in the toolpath list
Let me know if you'd like any additional files, machine settings, or post logs. I'd really appreciate help resolving this so I can reliably post and run on the 808D.
Thanks!
Luke
