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Thread: Spindle motor replacement

  1. #41
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    Default Re: Spindle motor replacement

    The reason I don’t want to go with a kress is because then I couldn’t use the r8 collet


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  2. #42
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    Default Re: Spindle motor replacement

    https://motorsandcontrol.com/media/d...heets/9433.pdf that is the motor driver i am currently using



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    Default Re: Spindle motor replacement

    Quote Originally Posted by KyleWarren View Post
    https://hobbyking.com/en_us/turnigy-...v-60-glow.html that is the motor i was thinking about useing
    I think that's wishful thinking. If such small motors could be used the same way as I can use my high speed spindle, which is also 1.5kW, and would perform equally then I believe everyone would use them. I mean, 300rpm/V would be ideal for low speed applications since it would mean 3krpm at 10V and that low speed is an issue for most high speed spindles. Also, don't forget that the current capacity 65A is ONLY for a maximum duration of 15sec... I think that motor also needs a massive fan for cooling without that I guess the motor will overheat in no time, the bearings are probably poor for CNC application since it is been designed for spinning a prop only, and not for milling.

    https://www.youtube.com/c/AdaptingCamera/videos
    https://adapting-camera.blogspot.com


  4. #44
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    Default Re: Spindle motor replacement

    Quote Originally Posted by KyleWarren View Post
    If i can figure out a power supply and a cooling solution, a brushless motor is probably what i would go with. I have a 24v 15 amp transformer but I don’t think that is enough to drive the motor.


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    The motor you linked to has a maximum voltage of 26V. If you have a transformer which is 24V then after the rectifier you will have 34VDC which is too much for the motor. Perhaps you mean you have a 24V 15A power supply, not just a transformer... in which case you are safe. With 24VDC you will get 7200rpm... but also take care of the heat...

    https://www.youtube.com/c/AdaptingCamera/videos
    https://adapting-camera.blogspot.com


  5. #45
    Community Moderator Al_The_Man's Avatar
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    Default Re: Spindle motor replacement

    Quote Originally Posted by KyleWarren View Post
    that is the motor driver i am currently using
    That is one that is commonly used with the 2hp T.M. motors,
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
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  6. #46
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    Default Re: Spindle motor replacement

    Quote Originally Posted by KyleWarren View Post
    the motor i was looking at was 1400 watts brushless and there wasn't any torque information

    You can see how much torque will be available using an online torque / hp calc like this:

    HORSEPOWER TO TORQUE CALCULATOR

    You just need to know the motor's rated speed and the HP (or KW).

    The rule is, the lower the base speed, the more torque a motor will have for a given hp. I.e. An 1800 rpm 1hp motor will have twice the torque of a 3600rpm 1hp motor. The higher rated speed, the less powerful it will be. It's why you need a crane to lift a 1hp Bridgeport spindle head while a 1hp router spindle is teeny tiny.

    If you lower the speed using a VFD, the torque will remain the same. If you use a gear reduction, you double the torque when you half the speed ( because hp remains constant).



  7. #47
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    Default Re: Spindle motor replacement

    Quote Originally Posted by Goemon View Post
    If you lower the speed using a VFD, the torque will remain the same. If you use a gear reduction, you double the torque when you half the speed ( because hp remains constant).
    And how are they going to run a DC motor on a VFD Drive, you should try to understand what is being posted

    Mactec54


  8. #48
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    Default Re: Spindle motor replacement

    Quote Originally Posted by mactec54 View Post
    And how are they going to run a DC motor on a VFD Drive, you should try to understand what is being posted
    It doesn't matter if the speed is reduced by a VFD or by a dc motor speed controls, the point is that if a belt or gear reduction is not used then hp goes down as the speed reduces and you lose the opportunity to increase low speed torque. It's you that should try to understand what is being said. You should read up on this topic.



  9. #49
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    Default Re: Spindle motor replacement

    As I mentioned before HP is RPM related, torque is not, all the DC and BLDC motors I use, the continuous rated torque curve starts at Maximum at zero rpm and gradually slopes down until the maximum rated RPM is reached.
    Torque is current related,
    https://www.electrotechnik.net/2014/...ion-motor.html
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


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    Default Re: Spindle motor replacement

    I bought a 1 hp treadmill motor that is 6000 rpm



  11. #51
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    Default Re: Spindle motor replacement

    Quote Originally Posted by Al_The_Man View Post
    Then you may as well go with a Kress or similar with a simple triac controller.
    I always got a kick out of the numbers quoted around RC motors etc.
    Like a 2Kw for a motor you can fit in your hand!
    Al.
    A Kress is just a larger version of a Dremel, not a very good choice, a regular Dewalt trim router is as good as a Kress for a less money

    Mactec54


  12. #52
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    Default Re: Spindle motor replacement

    Kress has higher quality bearings and is more like a spindle than a router!
    I would not even put it in the same class as a Dremel.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


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