Newbie Q: Why do CNC machines have such big motors?


Results 1 to 8 of 8

Thread: Newbie Q: Why do CNC machines have such big motors?

  1. #1
    Member ballsystemlord's Avatar
    Join Date
    Sep 2021
    Location
    Georgia
    Posts
    6
    Downloads
    0
    Uploads
    0

    Default Newbie Q: Why do CNC machines have such big motors?

    So I have been looking at CNC machines, such as this one https://www.tramarindustries.com/lis...#machine-specs and I noticed that most CNC machines have big motors on them. The one linked has a 25HP motor. I expected that to turn a shaft to cut metal it would be more like a 10HP motor.

    Obviously, CNC machines will use the 25HP of their motors' if they have it. But I'm rather lost as to what exactly they'll use all that HP for.

    Why do CNC machines have such big motors?

    Thanks!

    Similar Threads:


  2. #2
    Member
    Join Date
    Jan 2013
    Location
    england
    Posts
    474
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by ballsystemlord View Post
    So I have been looking at CNC machines, such as this one https://www.tramarindustries.com/lis...#machine-specs and I noticed that most CNC machines have big motors on them. The one linked has a 25HP motor. I expected that to turn a shaft to cut metal it would be more like a 10HP motor.

    Obviously, CNC machines will use the 25HP of their motors' if they have it. But I'm rather lost as to what exactly they'll use all that HP for.

    Why do CNC machines have such big motors?

    Thanks!
    In simple terms, they don't.
    Those with "big" spindle motors tend to run at lower speeds for bigger components so able to have enough torque to cut metal.

    For example, the 8000rpm speed quoted is quite high, but maybe due to gear ranges. So probably has a lot of grunt at lower spindle speeds.

    Last edited by servtech; 02-07-2023 at 12:25 PM.


  3. #3
    Community Moderator Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    5717
    Downloads
    0
    Uploads
    0

    Default Re: Newbie Q: Why do CNC machines have such big motors?

    This is why



    Jim Dawson
    Sandy, Oregon, USA


  4. #4
    Member deadlykitten's Avatar
    Join Date
    Jun 2015
    Location
    Antarctica
    Posts
    4131
    Downloads
    0
    Uploads
    0

    Default Re: Newbie Q: Why do CNC machines have such big motors?

    it is interesting how servtech talked about low rpm high torque application, and jim showed high rpm low torque

    and the average user is in between / kindly

    we are merely at the start of " Internet of Things / Industrial Revolution 4.0 " era : a mix of AI, plastics, human estrangement, powerful non-state actors ...


  5. #5
    Member
    Join Date
    Jan 2013
    Location
    england
    Posts
    474
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by deadlykitten View Post
    it is interesting how servtech talked about low rpm high torque application, and jim showed high rpm low torque

    and the average user is in between / kindly
    Indeed.
    But for example a 5 litre diesel engine in low gear has a lot of torque. That's why you change down to climb a hill or a tractor to plough a field. It's all about getting the motor into its optimum power band. Same applies to cutting metal.



  6. #6
    Community Moderator Al_The_Man's Avatar
    Join Date
    Dec 2003
    Location
    Canada
    Posts
    24216
    Downloads
    0
    Uploads
    0

    Default Re: Newbie Q: Why do CNC machines have such big motors?

    DC - BLDC motors exhibit the highest continuous torque at zero RPM, consult the manuf. Torque/RPM charts.

    Last edited by Al_The_Man; 02-08-2023 at 11:38 AM.
    CNC, Mechatronics Integration and Custom Machine Design

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


  7. #7
    Member
    Join Date
    Jun 2018
    Location
    on my feet
    Posts
    962
    Downloads
    1
    Uploads
    0

    Default Re: Newbie Q: Why do CNC machines have such big motors?

    I'd say that daewoo in the link is more designed for lower speed hogging based on it's specs . Most big insert tools for steel jobs require a lot of torque . A 4" porcupine for example needs a lot of power behind it to use the tool to it's fullest potential . Hogging needs a big spindle motor as do high speed high feed machines , their requirements are just different



  8. #8
    Member ballsystemlord's Avatar
    Join Date
    Sep 2021
    Location
    Georgia
    Posts
    6
    Downloads
    0
    Uploads
    0

    Default Re: Newbie Q: Why do CNC machines have such big motors?

    Thanks everyone. That answers my question.



Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Newbie Q: Why do CNC machines have such big motors?

Newbie Q: Why do CNC machines have such big motors?