Messages

11

Mach4 General Discussion / Re: Step pulse duty cycle

« on: April 20, 2019, 05:15:18 AM »

Craig,

Thanks very much for that comprehensive answer.
I've seen videos of closed loop working far faster than what I am achieving, and set to a 1000 steps, I don't think any on the ESS though. I'm only looking for about 3000mm/min, at the moment I'm getting to about 1800. The drivers default, and lowest division is 400, so I've set it to that and got to 4000mm/min, I was hoping to keep to the 10um accuracy, so it's not that far off.
My current open loop drives are set to a 1000 and I'm getting a stall free 1800 out of those.
The closed loop is certainly smoother sounding and feeling and much cooler.

I think the problem is the signal to the driver, I think the driver is just not getting the faster signal from the ESS. I'm going to experiment a bit and generate my own signal to see if it performs as the vendor describes with a 1:1 square wave, then look at my options.

Many thanks

Carl.

12

Mach4 General Discussion / Re: Step pulse duty cycle

« on: April 19, 2019, 05:51:50 PM »

Thanks for the response.

Warp 9 tell me the pulse width is 10us below 50k then it's 50% duty cycle up to the 4m max.

I'm running on 36v, i've tried 45 but it didn't make a massive difference.
I have the driver set to 800 steps/rev, and was trying to run at a feed rate that worked out at 360rpm. The motor was stalling but not alarming, without load just running on a bench.
I workd it out at a 4.8k pulse, way below the 125k they said was max.

I'm trying to get a feedrate of 3000mm/min, but to do that i had to set to 400 pulses per rev, way below the accuracy i wanted on a 5mm pitch screw.

I think a refund may be whats called for and try a different supplier.

13

Mach4 General Discussion / Re: Step pulse duty cycle

« on: April 19, 2019, 10:54:46 AM »

The duty cycle is the portion of the pulse that is high and lo. A 1:1 should be 50% high and 50% lo. The pulse width is the hi and lo combined. Thats my understanding anyway 😊

14

Mach4 General Discussion / Re: Step pulse duty cycle

« on: April 19, 2019, 10:49:14 AM »

The supplier said change duty cycle of mach 4 to 1:1, And keep it below 125k. Not sure if mach 4 dictates the duty or the ESS. I need to check it with a scope later.

15

Mach4 General Discussion / Step pulse duty cycle

« on: April 19, 2019, 10:06:41 AM »

I'm running Mach 4 with an ESS smoothstepper. I'm having issues running a closed loop Nema23 at anything like a speed I expected. I've been advised by the supplier to change the duty cycle to 1:1. Can anyone advise how to check / change this in Mach 4 ?

16

General Mach Discussion / Re: xbox controller joysticks wont step

« on: January 11, 2017, 07:58:22 AM »

Thanks for the reply, and the link.
I noticed in the doc something about the pad below the left joystick.
The Pad below the left joystick steps whichever axis is set to the left joystick. If it's x+y it will step those, if it's z+a it will step those.
I'll look at proper pendant / solution to this when I've finished setting up my machine.
Thanks
Carl

17

General Mach Discussion / xbox controller joysticks wont step

« on: January 07, 2017, 11:50:15 AM »

I'm new to Mach 3. 
Got it set up with an Xbox controller. X,Y and Z jog on rapid with the Joysticks, no issues.
I've set the yellow button to change the Jog Mode from Cont to Step, which it does. If is use the keyboard when it's on step, it moves the amount I've set the step to, 0.1mm, which is great.
When I have it set in step mode, the joysticks on the Xbox controller still Rapid Jog.
Is this a setting I've missed or is that normal ? I've seen vids of people using the Step mode with the Xbox controller though !
I've looked through the forum and was not able to find an answer.