Bridgeport Manual to CNC conversion...

[Davek0974]

What can make the tool not follow the path correctly?

Did some work today and as seen here its clearly pulling away from the corners far too early - corner rounding?



Not quite so clear here...



Cutter was 2mm at 23000rpm, 1000mm/min, X&Y speed set at 3500mm/min and 350mm/s/s in motor tuning.

[JAZZCNC]

Your getting because of constant velocity and tight radius most likely caused by low accelleration. Try setting accelration higher and see if better.

[Davek0974]

Ok, what sort of acceleration should i be aiming for if i have a top speed of 3500mm/min and bearing in mind this is a Bridgeport with a fairly heavy table;)

[JAZZCNC]

Ok, what sort of acceleration should i be aiming for if i have a top speed of 3500mm/min and bearing in mind this is a Bridgeport with a fairly heavy table;)

I'd up it until starts stalling motors then back it off 25%. 750s/s would be nice figure to aim for.

[Davek0974]

Ok, i'll try upping it but it would not stall - it has some fairly big AC servo's on it and a 2:1 reduction so damage would occur first i think or drive shut-down maybe.

[JAZZCNC]

Ok forgot you have servos But same applies really however instead of stalling you'll get position errors or drive trips.! . . . You'll know if OTT

[Davek0974]

Ok I'll dive in tomorrow night, thats the thing with servo's - you have to set an acceleration and top speed then tune the servo drive, it takes a fair bit of time to do each axis.