On going chinese 6040 problems

[EddyCurrent]

HOLD on just looked at my video again and noticed my step pulse was set at 2.

Good observation, more things to try !. Make a note of what you change and the result, so you can look back and determine the best settings.
Also I think it's fair to say most people set their microstep to 1/8 so aim for that but if the machine can't manage then reduce it like you did.

[Clive S]

Mike Glad to hear you now have some movement and are getting there. If you can sell your other kit back on EBay I would because you can get much better motors and drives than those you have. Or at least sell the motors and look at the ones from the link I posted. Good luck. ..Clive

[amxen]

OK last testing for this evening . I just wend down and changed it all back to how it was and then changed the step pulse to 15 and the dir pulse to 10 . Dont know why them numbers i just thought i would see what happens. I now have it set like this and it seem not to be stalling

steps per = 320
velocity = 1700
acceleration = 160
step pulse 15
dir pulse 10

i have no idea about the step and dir pulse but it seems not to be stalling like this . and i cant stall the motors by hand .
I did try it faster (1800) but it did start stalling so i wound it back down.

gonna try cutting some mdf tomorrow. This was the first thing i cut when i got it just to test it

[JAZZCNC]

Ok well I think you main problem is coming from the BOB and the fact it will have slow opto isolators. This is why your getting better results using higher step pulse.
Try running in Sherline mode and see how it goes because all thou your set at 10 -15 your not getting that as Mach in normal mode doesn't go that high.? Sherline mode gives you wider step pulse so gives the opto's more time to work. You'll find it in port's n pins on first page near Kernal speed. You'll have to restart Mach3 and retune motors.

To be honest you have several issues here all of which can only be cured with a bullet or a mallet.!! . . . . Crap celectronics give crap results.

With the high inductance motors you have and only 24Vdc running rubbish drives thru a piss poor BOB then in all fairness your near the end of what should be expected. Sell the lot and buy decent drives. Don't go for the G540 as there are better options for less money and the Gecko is restricted to 3A motors to use it's full capabiltys.
Your main issue with slow speed is lack of volts but don't go giving the drives more because you'll fry them. Max they will stand is 36V and they won;t like that for long before letting out magic smoke plus 36v isn't much better than 24V with these motors and you'll need 50V drive running 44-46V to get any decent speed from them.

Now with the stalling and micro stepping then after the short pulse width problem then resonance is the next issue you'll be encountering. Resonance affects motors in differant ways and is often worse when sat on the bench.
Also the micro stepping plays it's part here as well. Setting the Micro steps too near to full Step 1-1 often makes resonance worse so stalls more. Setting higher makes the motors run smoother so less stalling but this comes at the cost of many more pulses required which in your case makes things worse because your Rubbish BOB can't keep up as it is.!!. . . So it's a double edge sword I'm afraid.!! . . . Fubar'd in both cases.!!. . . Time to get Timmy out.!!

This is why decent electronics and the quality of the pulses being sent to the drives/motors is so very important.

[amxen]

Thanks for that information Jazz . When i do upgrade the electronics what BoB would you go for ?


The wonderful world of cnc, I only wonted to cut stuff and ended up being an electrical engineer

[EddyCurrent]

Some reading,

http://microsoftwindowsblogger.blogs...nel-speed.html

[JAZZCNC]

Thanks for that information Jazz . When i do upgrade the electronics what BoB would you go for ?

Well at the cheap end then I'd look at Roy's boards at DIYCNC they are ok for the money and I've used many of the opto boards. At the other end then and by far the best BOB on market for the money is the PMDX126 but this can only be bought direct from PMDX. It cost's much more but there's a reason, It's quality.

If you want good quality ALL-in ONE board with Digital drives and spindle speed and BOB all built in then you want the Lead shine MX3660 from Zapp http://www.zappautomation.co.uk/elec...ng-driver.html

Though it's an all in one board the drives can be replaced individual if one is damaged.
The drives allow upto 6A motors run at 60Vdc thou in real use you'd run around 50-55Vdc for a safety margin. The drives are Digital so very good at handling resonance and give very smooth movement compared to cheap analog drives with advanced features to help with handling pulse smoothing etc. They have standard current reduction at stand still etc to control motor heating but in general they run the motors much cooler because of the way the handle current.

No BOB required it's built in. Also Comes with 10V Analog spindle speed controller built in so can control spindle from control software or G-code.

This Digital Combo board knocks the socks off Gecko G-540 IMO and yes I have used G540 infact I have one in front of me now, because it can be used with much wider range of motors due to being 6A and the extra volts allow more speed !! If needed.!! . . . but the only draw back is it's only 3 axis not 4 like the gecko.

This is a good Combo board that will take with you to another larger build if required and there's virtually nothing to setting it up, close to plug n play as it gets.

[amxen]

Thanks for that Jazz . it seem to be running well now. with the changes i made yesterday. happy days for now.

Well im thinking i will have to upgrade it at some point going by most of the posts about them.

So i have been looking at this http://www.diycnc.co.uk/html/system45.html and was thinking i have this kit i got from aliexpress http://www.aliexpress.com/snapshot/6104230003.html ( was gonna make my own cnc ) and was thinking would this diycnc board be ok to run these stepper motors and utilize the 36a power supply from this kit.

[Clive S]

Thanks for that Jazz . it seem to be running well now. with the changes i made yesterday. happy days for now.

Well im thinking i will have to upgrade it at some point going by most of the posts about them.

So i have been looking at this http://www.diycnc.co.uk/html/system45.html and was thinking i have this kit i got from aliexpress http://www.aliexpress.com/snapshot/6104230003.html ( was gonna make my own cnc ) and was thinking would this diycnc board be ok to run these stepper motors and utilize the 36a power supply from this kit.

Mike The kit you are referring to will still only take 40V psu so yes it will take the 36V psu you have but you are still throwing good money after bad. To run the motors you have you will need at least 50V psu. If you are up and running now how about getting some experience with the machine and cutting a few parts and then you have a better idea what you really want.
.
I am not trying to put you off, the trouble is these kits that you have seen are always a compromise and are put together with a mismatch of bits and you can do a lot better with sourcing the parts separately. As have been said many time on the forum a good place to buy the motors is cnc4you or Zapp and the drivers from aliexpress. ..Clive