[burnley1]

Hello people.
I have an issue, mine stepper motors not running smooth, its like PC is not sending pulses to motors continously. Its like there are some delays at random times between pulses.
Also sound of motors is not continous, noises every cca half a second, and alot of vibrations cause of it.
I run via MACH3, Windows XP. I ran DriverTest in Mach3 folder and graph looks like this.
I've done some things already: Formatted and Reinstall windows, change PC mode from ACPI to Standard PC change pulse width from 0 to 5us in Motor Tunning in MACH3... and strange motor running is still present. I have DB25 1205 breakout board and its connected via LPT.

Do you have any recommendations what to do?
https://www.cnczone.com/forums/attac...d=482812&stc=1
Thank you, Matic

[dazp1976]

You also could do with telling us:
What machine you are using it on.
Which stepper motors.
Which stepper drivers.
What voltage/ampage power supply you're using to run the drivers.

[burnley1]

My custom made CNC.
Stepper motors: https://www.omc-stepperonline.com/p-...s-24hp39-5004s
Stepper drivers: https://www.longs-motor.com/stepper-...er-dm860a.html
Power supply: DC 60V 5.9A, I have 3 PS's, one for each motor driver.

[dazp1976]

Stepper motors: https://www.omc-stepperonline.com/p-...s-24hp39-5004s
Stepper drivers: https://www.longs-motor.com/stepper-...er-dm860a.html
Power supply: DC 60V 5.9A, I have 3 PS's, one for each motor driver.

Well, that certainly isn't a bad setup. I'd expect them to fly. For the 5A motors I normally set driver peak at 4.9A. Then keep an eye on motor heat. If pretty cool set to 5.7A peak and check again.

I use MM for measurement, and 5mm pitch screws.
For this bob and the above MM/pitch I'd start with:

Mach set at 25khz.
Driver per rev at 1000.
Steps per at 200.
My us were set at 3 & 8
That will give you good max velocity available.

If it works well then try:
25khz.
2000.
400.
If available max velocity is too low then put Mach at 35khz.
Tbf, 35khz/2000/400 settings are about enough for these boards.

Do you have the wiring diagram you used for the bob & drivers?.

[burnley1]

Well, that certainly isn't a bad setup. I'd expect them to fly. For the 5A motors I normally set driver peak at 4.9A. Then keep an eye on motor heat. If pretty cool set to 5.7A peak and check again.

I use MM for measurement, and 5mm pitch screws.
For this bob and the above MM/pitch I'd start with:

Mach set at 25khz.
Driver per rev at 1000.
Steps per at 200.
My us were set at 3 & 8
That will give you good max velocity available.

If it works well then try:
25khz.
2000.
400.
If available max velocity is too low then put Mach at 35khz.
Tbf, 35khz/2000/400 settings are about enough for these boards.

Do you have the wiring diagram you used for the bob & drivers?.

Thank you.
Motor heat is ridiculous, they are very hot IDK why btw. I have 4mm and 3mm on Z axis pitch screws.
Good I will try this setup you wrote once I get my motors running smoothly.
Yes I wrote diagram here you are:
https://www.cnczone.com/forums/attac...d=482818&stc=1

[dazp1976]

Thank you.
Motor heat is ridiculous, they are very hot IDK why btw. I have 4mm and 3mm on Z axis pitch screws.
Good I will try this setup you wrote once I get my motors running smoothly.
Yes I wrote diagram here you are:
https://www.cnczone.com/forums/attac...d=482818&stc=1

Are you using ballscrews or trapezoidal?
You want ballscrews tbf. Motors will struggle a bit with trapezoid.
For 4mm screws:
Divide your driver steps per rev by 4.
So if put driver at 1600 per rev, put step per unit at 400.
1000/200
1600/400
2000/500
And so on
Check your machine for any binding. My setup is more or less the same. I've got set at 4.9A peak and they're cool running.

For 3mm screw? divide driver steps per by 3.
But I think this pitch may prove problematic tbf.
There isn't really a good driver setting for this divisible by 3. Example: 1600 would be 533.333333333 steps per unit, not that accurate.

A lot of people with problems using the NVEM/NVUM Novassun. They're very hit and miss. 50/50.

[liefer]

You have to experiment with different amp and step setting till you find the sweet spot.

[burnley1]

You have to experiment with different amp and step setting till you find the sweet spot.

Thank you, I already tried many different settings at stepping and amperage but motors runing strangely no matter I change the settings.
I think the problem is at PC due to unstable output frequency through parallel port LPT.

[dazp1976]

Thank you, I already tried many different settings at stepping and amperage but motors runing strangely no matter I change the settings.
I think the problem is at PC due to unstable output frequency through parallel port LPT.

Darn if. Your best option now then is either:
1. Get a cheap new motherboard and replace it. Or a cheap pc. Usually loads on ebay.
2. Get an ETHERNET controller and hook up your existing bob to it via DB25-IDC26 cable.

DO NOT waste your time with usb controllers. Nearly every problem I see is when using a USB.
(well except for whan a pport fails).

[burnley1]

Darn if. Your best option now then is either:
1. Get a cheap new motherboard and replace it. Or a cheap pc. Usually loads on ebay.
2. Get an ETHERNET controller and hook up your existing bob to it via DB25-IDC26 cable.

DO NOT waste your time with usb controllers. Nearly every problem I see is when using a USB.
(well except for whan a pport fails).

Thank you!
1. Good, I will try to replace motherboard with processor on it (i have one old pc laying around at home) and reinstall everything, do you suggest WIN XP, SP2 or SP3?
2. Do you think that I should replace my DB25 1205 BOB with ethernet BOB? I was googling and found this one: Novusun NVEM V2 Ethernet BOB and run it via ethernet connection insead of parallel port?

My DB25 1205 cheap BOB with LPT:
https://www.cnczone.com/forums/attac...d=482822&stc=1

Novusun NVEM V2 Ethernet
https://www.cnczone.com/forums/attac...d=482820&stc=1

[joeavaerage]

Hi,

I will then just test microstep setting at 4, 5, 8, 10 and see how motors run then.

I doubt you'll notice much difference. Sure the 10 microstep per full step (2000 pulse/rev) is supposedly better than 5 microsteps per full step (1000 pulses/rev) but you may not notice any
difference. Settle on one that is a good match (speed wise) to your parallel port and leave it there. Its not worth wasting your time on.

Craig

[burnley1]

Hi,



I doubt you'll notice much difference. Sure the 10 microstep per full step (2000 pulse/rev) is supposedly better than 5 microsteps per full step (1000 pulses/rev) but you may not notice any
difference. Settle on one that is a good match (speed wise) to your parallel port and leave it there. Its not worth wasting your time on.

Craig

So I wont waste my time for those settings, I will just set to 2000pulse/rev, test it if its good and leave it like that. Thank you!

[dajanasa1]

I have had this problem in the past and when I changed PC's to a different one it disappeared.
It was a problem inside the old PC.
Hope this helps.

[burnley1]

I have had this problem in the past and when I changed PC's to a different one it disappeared.
It was a problem inside the old PC.
Hope this helps.

Good man, I also changed my PC and problem was fixed