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  1. #281
    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;)

  2. #282
    Quote Originally Posted by Davek0974 View Post
    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.

  3. #283
    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.

  4. #284
    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

  5. The Following User Says Thank You to JAZZCNC For This Useful Post:


  6. #285
    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.

  7. #286
    But left side corners are undercut and right side corners are overcut, from what i see. So i dont think its the acceleration. What does that tell? To me- mechanical play.
    project 1 , 2, Dust Shoe ...

  8. #287
    no, the corners are "dog-boned" or "T-boned" to get a square object in there.

    maximum play is 0.04mm on any axis.

  9. #288
    Instant improvement, same code as before, same feeds etc just the increased acceleration in motor tuning.

    Nice corners, no sign of rounding at all.

    At least it now works up to 1000mm/min feed rates, no idea how much beyond that as i have no job that needs it.

    Click image for larger version. 

Name:	IMG_1636.jpg 
Views:	53 
Size:	1.42 MB 
ID:	19737

    Click image for larger version. 

Name:	IMG_1637.jpg 
Views:	61 
Size:	1.11 MB 
ID:	19738

  10. #289
    Quote Originally Posted by Boyan Silyavski View Post
    But left side corners are undercut and right side corners are overcut, from what i see. So i dont think its the acceleration. What does that tell? To me- mechanical play.
    That tells me you know nothing.! . .

  11. #290
    Quote Originally Posted by Davek0974 View Post
    Cutter was 2mm at 23000rpm, 1000mm/min, X&Y speed set at 3500mm/min and 350mm/s/s in motor tuning.
    Attachment 19724
    Quote Originally Posted by Davek0974 View Post
    Instant improvement, same code as before, same feeds etc just the increased acceleration in motor tuning.
    Nice corners, no sign of rounding at all.
    At least it now works up to 1000mm/min feed rates, no idea how much beyond that as i have no job that needs it.
    Click image for larger version. 

Name:	IMG_1637.jpg 
Views:	61 
Size:	1.11 MB 
ID:	19738
    Just to clarify please, that the only difference between the Before and After results above was an increase in acceleration in motor tuning?

    That's quite amazing!

    P.S. Apologies that the first damn image (Attachment 19724) keeps appearing and then disappearing from automatic display!!!
    Last edited by AndyGuid; 30-11-2016 at 03:40 AM. Reason: Afraid the first damn image keeps appearing then disappearing from automatic display!!!

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