I have mastercam x4 when I post a file and load it into mach3 some of the radius on the part are converted into very large arcs unlike the drawing . I double checked the drawing in mastercam and back plot and it is right but when it gets to Mach3 the radius's not all of them but some of them are changed . has anyone else had this problem and what can I do to fix it ?
I have recently contacted Mastercam regarding their latest Post Processor for Mach3 / Mach4 and their response was to say the least disappointing. Others may have better luck but don’t hold your breath whilst waiting for anything helpful.
Mach3 handles arcs in both Absolute and Incremental Modes and to avoid confusion it’s Gcode should always contain the G90.1 or G91.1 (as appropriate). It is usually the job of the CAM Post Processor to insert these commands but Mastercam does not really bother with Mach so the commands are omitted from their p.p.
You can correct the situation by changing the IJ Mode (Config. / General Config.). The IJ Mode is a modal setting and once changed will remain but to be certain of avoiding future problems it would be best to add the G90.1 or G91.1 (as appropriate) to the start of all Gcode files containing arcs. The G90.1 or G91.1 should be on a separate line at the start of the Gcode and certainly not share the same line as a G90 or G91.
Tweakie.
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