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Thread: Identifying stepper motor in order to replace

  1. #1
    Member Lennyglyn's Avatar
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    Default Identifying stepper motor in order to replace

    Hi, not just needing help but newbie alert too.

    I think I need to replace one or both of the steppers in my laser machine. It is Chinese built, runs on Lasercut 5.3. The motors have a label on them but try as I might I can't find out anything about them (see attachment). As much as I know is that they are NEMA 17, the bodies are about 38mm / 1.5" deep and they have four wires. The label reads 42-H250C13, and NO 1411 is on the second line followed by a lot of Chinese characters.

    Does anyone recognise these and know where to get replacements? Or just know the full spec so I can find a like-for-like replacement, maybe better quality?

    Many thanks!

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  2. #2
    Member Jim Dawson's Avatar
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    Default Re: Identifying stepper motor in order to replace

    This would be a good place to start. https://www.automationtechnologiesinc.com/

    Are you sure the motor is bad? Stepper motors are about the last thing to fail in a system.

    Jim Dawson
    Sandy, Oregon, USA


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    Default Re: Identifying stepper motor in order to replace

    I never had one fail and very unlikely two would go at the same time. Try swapping with another motor just to see if it’s the driver. Never unplug one of these with power on.


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    Member Lennyglyn's Avatar
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    Default Re: Identifying stepper motor in order to replace

    Thanks, will take a look



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    Member Lennyglyn's Avatar
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    Default Re: Identifying stepper motor in order to replace

    Quote Originally Posted by Dean448 View Post
    I never had one fail and very unlikely two would go at the same time. Try swapping with another motor just to see if it’s the driver. Never unplug one of these with power on.


    Sent from my iPhone using Tapatalk
    The machine has recently started cutting round holes as skewed ovals and non-square square holes. This follows a heavy collision of the head, with lots of grinding noise until I managed to hit stop. I have to clamp some materials onto the table and try to keep out of the way of the clamp heaps, bvut on this occasion I screwed up. I have checked all the usual things to see if there is an external mechanical cause of what looks like a backlash issue, but nothing seems to improve it. Tried belts tighter, looser, made sure everything is lined up and lubricated, so the last thing is what I can't see - inside the stepper. I admit to ignorance on the subject of stepper motors, I have no idea if they have any toothed or geared parts inside, but the cutting results are indicative of some "slop" in the system that I can't find in the open parts of the drives.



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    Member Jim Dawson's Avatar
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    Default Re: Identifying stepper motor in order to replace

    There are no mechanical mating parts inside of a stepper motor. The coupling is all magnetic. They can ''grind'' away all day long and not be damaged. The noise is caused by the magnetic decoupling of the stator/rotor. It goes back to normal once power is removed.

    Something else is the cause of your problem there. There is a very remote possibility that the press fit between the rotor and the shaft has come lose, but I have never seen this happen. If the stepper motor is connected to a gear box, then it is possible that the gearbox is damaged, but even this is not common. I'm not able to see exactly what the stepper is driving, but from your description I suspect it's just a pulley that drives the belt.

    It is possible that the pulley is loose on the motor shaft.

    Jim Dawson
    Sandy, Oregon, USA


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    Member Lennyglyn's Avatar
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    Default Re: Identifying stepper motor in order to replace

    Quote Originally Posted by Jim Dawson View Post
    There are no mechanical mating parts inside of a stepper motor. The coupling is all magnetic. They can ''grind'' away all day long and not be damaged. The noise is caused by the magnetic decoupling of the stator/rotor. It goes back to normal once power is removed.

    Something else is the cause of your problem there. There is a very remote possibility that the press fit between the rotor and the shaft has come lose, but I have never seen this happen. If the stepper motor is connected to a gear box, then it is possible that the gearbox is damaged, but even this is not common. I'm not able to see exactly what the stepper is driving, but from your description I suspect it's just a pulley that drives the belt.

    It is possible that the pulley is loose on the motor shaft.
    Thanks Jim, that is very helpful. I will disassemble the drives today to see if I can find anything outside the motors.



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    Member germanr's Avatar
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    Default Re: Identifying stepper motor in order to replace

    If I understand the description of the problem, I recommend you to check the LaserCut configuration.
    It can be a configuration issue of the steps of the motors and the size of the working area.
    You should use the system.cfg file that comes with your machine.

    Regards!

    we are:

    BuchiCNC USA

    You can check our CO2 laser cutters here:
    CO2 Laser cutting machines

    If you want a metal laser engraver:
    Laser metal engravers

    Great CNC Router:
    CNC Routers



  9. #9
    Member Lennyglyn's Avatar
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    Default Re: Identifying stepper motor in order to replace

    - - - Updated - - -

    Quote Originally Posted by germanr View Post
    If I understand the description of the problem, I recommend you to check the LaserCut configuration.
    It can be a configuration issue of the steps of the motors and the size of the working area.
    You should use the system.cfg file that comes with your machine.

    Regards!

    we are:

    BuchiCNC USA

    You can check our CO2 laser cutters here:
    CO2 Laser cutting machines

    If you want a metal laser engraver:
    Laser metal engravers

    Great CNC Router:
    CNC Routers
    Thank you, I will take a look at that.



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Identifying stepper motor in order to replace

Identifying stepper motor in order to replace