mach 3 cv mode stalling

[PCW_MESA]

ive considered that, and decided it was false. mach obeys acceleration limits fully. there is a bug in certain types of high complexity corners.

yup, its a very serious bug, and it will prevent me from using on the new machine it perhaps, but emc2's contouring control is still beyond terrible, and no amount of suggesting mach's is worse will fix it

There is 0 doubt that acceleration or velocity limits are being violated (this is what causes a stall)

Whether its because of an obscure bug or that basic limits are not obeyed in some cases is not known until you instrument the point of failure.

[ihavenofish]

There is 0 doubt that acceleration or velocity limits are being violated (this is what causes a stall)

Whether its because of an obscure bug or that basic limits are not obeyed in some cases is not known until you instrument the point of failure.

thats out of my realm. it doesnt matter at this point.

mach needs a fix, emc needs a rethink. maybe ill buy a fanuc system

[datac]

thats out of my realm. it doesnt matter at this point.

mach needs a fix, emc needs a rethink. maybe ill buy a fanuc system

Flashcut would be a whole lot cheaper and exactly zero CV "bugs". I do a lot of detailed engraving with tons of micro line segments. Like your fast environment, my engravers must run as fast as possible to be profitable.

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......

[ihavenofish]

Flashcut would be a whole lot cheaper and exactly zero CV "bugs". I do a lot of detailed engraving with tons of micro line segments. Like your fast environment, my engravers must run as fast as possible to be profitable.

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 always thought flashcut was a full system. can it just be installed like mach with an existing machine/break out board?

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.

[datac]

i always thought flashcut was a full system. can it just be installed like mach with an existing machine/break out board?

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.

Flashcut can be retro'd into most any emc, mach type environment quite simply as Flashcut also uses a conventional DB25 socket to communicate with the driver cabinet.

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 !

[lenne0815]

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...

[ihavenofish]

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...

sorry, havent come up with anything lately. your tweaking unfortunately is going to be variable. youll find it fixes one program stalling, but wont others.

[lenne0815]

sorry, havent come up with anything lately. your tweaking unfortunately is going to be variable. youll find it fixes one program stalling, but wont others.

actually it does, i didnt experience another stall after i did these adjustments, but just for rechecking, could u send me gcode that stalls for u 100 % ? i did install the newest dev version now and im about to test if something hast changed...

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 ?

[atypicalguy]

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.

[lenne0815]

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.

Thing is mach3s implementation isnt bad at all, if ure running 3d in a different mode as zigzag with irregular stepover it works really well, problem is that zigzag with non 90degree stepover is really the thing ull want to do as soon as ure doing more 3d stuff.

Maybe art itself could offer some suggestions to this Problem ?

[ihavenofish]

Thing is mach3s implementation isnt bad at all, if ure running 3d in a different mode as zigzag with irregular stepover it works really well, problem is that zigzag with non 90degree stepover is really the thing ull want to do as soon as ure doing more 3d stuff.

Maybe art itself could offer some suggestions to this Problem ?

machs countouring is actually very sophisticated, and id say better than many "low cost" vmc's abilities, like haas or fanuc mates from what ive seen. its only this one bug that holds up up. im fairly sure art know about it, but its likely incredibly hard to deal with. my understanding is its a logged bug. but in case im wrong, and he doesnt know, someone should point him to this thread

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".

[ger21]

Fwiw, Art retired from Mach3 several years ago.

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