Dynomotion

Group: DynoMotion Message: 7663 From: yeamans115 Date: 6/15/2013
Subject: motion profile descriptions?
i profiled the servo's to move nice on the X/Y but the z is wont get snappy. I raise up the acceleration (which I assume does the quickness once the "move" button is pushed?) a bunch more than the X/Y too.

the X/Y steps per unit are 16000 and the Z is 36864 if that makes the difference.

plus now that I am making chips again I notice that all the axis run real soft in the acceleration aspect.

I read something about different profiles depending if you push jog or rapid on the kmotion?

thanks matt
Group: DynoMotion Message: 7664 From: Tom Kerekes Date: 6/15/2013
Subject: Re: motion profile descriptions?
Hi Matt,

There aren't any Jog or Rapid buttons in KMotion.exe.

A common problem is to have too low of a max Jerk setting.  The max Jerk setting determines how fast or gradually the acceleration is applied and removed.  With a low Jerk setting even though you think you are allowing a lot of acceleration if the acceleration is applied very gradually then there will never be enough time to ramp the acceleration up to a large value.  It is like saying to a driver of a car it is ok to to push the gas or the brake all the way to the floor but it must be moved extremely gradually.

My rule of thumb is to set the Jerk value to 10 times the Acceleration value.  This will allow full acceleration in 0.1 seconds.

To simulate virtually no Jerk Limit where the Acceleration is applies almost instantly set the Jerk to 1000 times the acceleration value.

HTH
Regards
TK