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Topics - andert1

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General Mach Discussion / Mach 3 acceleration coding change
« on: May 28, 2012, 02:01:39 PM »
Hi All,

I have been using Mach 3 for a couple years for CNC work.  I am trying to use Mach 3 for a special motion control project, here is the situation: The motor I am running (a NEMA 42 4120 OZ/in motor) functions well up to about .4 in/s/s acceleration setting or lower (the min acceleration for 100 in/m max velocity) but I need to run it at 540 in/m (the system accelerates way too fast when I set the max velocity that high and causes a lot of problems).  My question is:  Does anyway know a method (maybe changing the code) so that I can run a a 540 in/m velocity but get to that speed with a low acceleration (.4 in/s/s) or lower?  Right now it looks like mach is designed to reach max velocity about 4 seconds from start.  My best guess at a simple solution would be to extend the ramp up to max time from 4 seconds to something much more gentle at high speeds, like 20 or even 40 seconds.  So my final goal is to have a max velocity of 540 in/min and to get to that speed over a period of time that is 20 seconds or longer with an acceleration of .4 in/s/s or less (.2/s/s would be about ideal)

Thanks for your help,
Tim

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