Mach's CV failed for me miserably when I tried to see what all the hub-bub was about. Now you have me wondering if toying with EMC is even worth it.
Flashcut has always handled CV with excellence......
i noticed a note in mach's change log for a recent "dev" version that mentiones acceleration issues with tiny arcs. i wonder if its related. i should try the new dev version to test.
Most of the Mach/EMC installations have used a breakout board on the driver side of things. There would likely be no need to completely rewire what you already have there..... probably just be a matter of making up a new DB25 cable or use one of those crossover adapters so you can take Flashcuts DB25 pinouts and apply them properly to your breakout boards pins. I did one not too long ago that had a cnc4pc board in it and the only change I had to make to get moving was related to the "charge pump" line which is not necessary with Flashcut. I did have to rework the 0-10v analog for spindle control, but over all, it was a no brainer conversion.
Regarding the small arcs..... I recall having more trouble trying to use actual arcs instead of small straight line segments. Perhaps that fix just deals with arcs and not line segs. Who knows !
Any news on this ? i do have the exact same Problem, i could only tweak it away by lowering acc and full speed, furthermore creating shorter gcode helped, i did set the option in mach 3 where u can set how much it looks into the future to its heighest setting aswell ( if i remember correctly its about 2000 lines )
After all my machine doesnt stall anymore but im running at only 2/3rds of the possible speed...
if ure unable to send anything would u agree that a 3d "bowl" is probably the best way to check it ? i think that would have the worst variation in stepover angles one could expect from a drawing ?
Is anyone thinking about NURBS controllers? Seems like EMC2 has a 2d version; a couple of guys seem to be developing 3D implementations. The anti-jerk and acceleration look ahead algorithms are pretty smart and easier to implement. I haven't seen one running in 3D though.
Maybe art itself could offer some suggestions to this Problem ?
i spent almost an hour on the phone with DMG this morning. im just about ready to ditch the hobby things and go straight to guaranteed performance. i have a new project coming and basically, a $150k 5 axis dmg is "cheaper" than almost anything else per part. go figure. i guess thats the difference between "fun" and "production".
Fwiw, Art retired from Mach3 several years ago.
A new "Known Bug List" was just started on the Mach forum. PM Andrew with the bug, as he's the official bug tester.
Mach3 2010 Screenset
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)