Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Davek0974 on June 23, 2015, 12:09:45 PM

Title: Step/port frequency
Post by: Davek0974 on June 23, 2015, 12:09:45 PM
Step frequency?

I need to drive a machine driven by two steppers at 9000mm/min using ballscrews, direct drive.

Is it as simple as...

9000mm/min with 20mm lead screw so 9000/20=450rpm

450*200 steps per rev=90,000 steps or pulses per min

90,000 / 60 = 1500 steps per second

so max frequency per axis is 1.5kHz ?????

Using 10x micro stepping would need 15kHz per axis?

If so would that be safe if my port is happy at 50kHz????


Many thanks
Title: Re: Step/port frequency
Post by: Davek0974 on June 25, 2015, 04:36:34 AM
Anyone???
Title: Re: Step/port frequency
Post by: RICH on June 25, 2015, 06:53:48 AM
Should be fine but you may want to use 25kHz as the Kernel Speed.

RICH
Title: Re: Step/port frequency
Post by: Davek0974 on June 25, 2015, 09:14:36 AM
Thanks, I did wonder why that was set at 50k - It changed when I installed the CandCNC MP3000-DTHCII unit and custom screen sets, I know they do some pretty funky stuff with the port, maybe thats the reason.

It passes the port test ok and has been running at 50kHz for about 9 months now so probably safest to stick with it, unless there is a good reason no to?

Might ask Tom at CandCNC.