Missing step on 3 axis operation
Hi all,
I`m using an MK3/4 controller updated to the latest version of the fw and I have a strabge situation.
If I work on XY plane the movement is smooth without any loss of steps, as soon as I make an XYZ move (like X100 Y100 Z50 F500) I have a lot of lost steps on the Z axis.
All the cable to the motors are shielded and I have also made a test with an external motor to avoid any interferences.
As driver I`m using the following one:
https://www.ebay.it/itm/TB6600-5A-CN...AAAOSwvh9coccB
with common ground connection.
Do you have any suggested setting to test?
Please let me know
Max
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Re: Missing step on 3 axis operation
It looks like you have problem with powersupply. Try mowing like x+z or y+z. Assumng you have same drivers on all motors... So 3x5A=15A, you shoud took at least 20A good powersuply that you are in safe side. Some China is marked much more than can handle while luck of components integrated - low price as much as possible...hmm
Re: Missing step on 3 axis operation
Hi Maki,
many thanks for your quick answer.
I can make some test on the next weekend as the machine is there.
What about reducing the output current from the driver? I will reduce the torque but I will be able to check if the problem is related to the power supply, correct?
Kind regards
Max
Re: Missing step on 3 axis operation
Hi,
tested reducing the max current to 1,8A but still missing steps...
Any idea?
Max
Re: Missing step on 3 axis operation
What machine?
What steppers?
What are your acceleration settings?
Re: Missing step on 3 axis operation
reducing the Amps won't solve problem, motors come evan weaker so more steps will be lost....Originally Posted by mmax65
more info abouth components will help
Re: Missing step on 3 axis operation
Hello.
Another fellow just had the same problem. May I suggest that you check the mechanics? If your machine was running properly and then started to show that loss of steps I´d rather check the mechanics.
It´s not uncommon for some of the locking screws to become loose producing slippage at the couplings. As I mentioned to the other guy, it´s rather simple to find out. If you remove the couplings and notice scratches on the shafts then you can be certain that there is slippage.
Another way to check it is by drawing a line with a marker pen both at the coupling and at the shafts of the motor and the transmission. It is important to check the axis under load because a dry test might conceal itself.
I hope this helps.
Regards.
Re: Missing step on 3 axis operation
here are some more info:
3 axis vertical milling machine
24HS34-3504D stepper motors
All test has been done at F500 and Acceleratio/decelaration at 250.
I can make some test removing the coupling and also verify if the mechanical movement is soft or not.
It`s possible that the problem is located on the drivers?
Max
Re: Missing step on 3 axis operation
Hello.
Yes, the problem could be in the drivers if the current setting is too low. That way not enough torque would be available and thus you get lost steps.
If your machine was working all right and then started to loose steps in my experience a mechanical mismatch is more likely the cause.
A loose locking screw can yield to some amount of slippage that, as its effect is cumulative, will end in loosing completely the position reference and if not taking care of it can eventually lead to tool crash.
Remember to test the axis under load.
Also try moving the transmission by hand in one direction and then in the other while the motor is still powered. No movement should be possible. BE CAREFUL WITH THIS ONE.
Even before removing the couplings you can try to tighten the screws. That way you can feel for any loose screw.
Let me know what you find.
Regards.
Re: Missing step on 3 axis operation
I have a look to stepper info, I'll go with 3,07A and 1600 microstepping as starting point (if you have sugesstet driver from same page), there you are in a safe side
rgds
Re: Missing step on 3 axis operation
For nema 24 those steppers have a very high inductance at 5.6mh.
What power supply are you using?
If your voltage is too low you will get no reliable speed from them at all.
If you use formula sqr rt of 5.6 * 32 = 75.7
So basically this suggests that to get the maximum performance you want to run them on a 75v power supply!
I would not run them on less than 60v.
I personally think that if you have drivers that take a max 50vdc then replace the steppers with 24HS39-4204D
https://www.omc-stepperonline.com/ne...s39-4204d.html
and run them on 48v.
Or change your drivers to something like DM860N or DM860Y and run these with your existing steppers on 60vdc
I have nema24 on my mill with 3mh inductance, 570oz/in, 4A.
Since running them on 60vdc & 4A peak the machine has come to life and there are no issues with heat or anything.
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