hybrid Closed Loop Stepper vs dmm servo


Results 1 to 11 of 11

Thread: hybrid Closed Loop Stepper vs dmm servo

  1. #1
    Member
    Join Date
    Jan 2012
    Location
    usa
    Posts
    67
    Downloads
    0
    Uploads
    0

    Default hybrid Closed Loop Stepper vs dmm servo

    2 types of motors hybrid Closed Loop Stepper vs dmm servo, if anyone here had personal experience with both motors i would like your opinion. whats best value for the money? asking cause i don't want to be disappointed when i buy mind i was look at these on ebay https://www.ebay.com/itm/428Oz-in-Cl...c7ae075e8d4b1b
    Thanks

    Similar Threads:


  2. #2
    Member
    Join Date
    Jan 2009
    Location
    Australia
    Posts
    23
    Downloads
    0
    Uploads
    0

    Default Re: hybrid Closed Loop Stepper vs dmm servo

    No comparison really. The DMM is a far superior product.
    It really comes down to your budget and what you are trying to achieve.
    Please don't mix up the torque ratings when comparing motors. Steppers are generally advertised at peak torque (at low rpm with torque falling off rapidly).
    Whereas servo's are rated at constant torque.
    Also consider the rest of your drivetrain. No point going for servo's if you are going to use ebay special C7 ballscrews with single ballnuts.
    Welcome to the Rabbit Hole.
    M



  3. #3
    Member
    Join Date
    Jan 2012
    Location
    usa
    Posts
    67
    Downloads
    0
    Uploads
    0

    Default

    I'm using Ebay ball screws from chai there double nut
    More Torque with lower feed rates don't plan on feeding more then 40 - 50 ipm and maybe rapid no more then 150-200 ipm



    Quote Originally Posted by mick41zxr View Post
    No comparison really. The DMM is a far superior product.
    It really comes down to your budget and what you are trying to achieve.
    Please don't mix up the torque ratings when comparing motors. Steppers are generally advertised at peak torque (at low rpm with torque falling off rapidly).
    Whereas servo's are rated at constant torque.
    Also consider the rest of your drivetrain. No point going for servo's if you are going to use ebay special C7 ballscrews with single ballnuts.
    Welcome to the Rabbit Hole.
    M




  4. #4
    Member
    Join Date
    Dec 2015
    Posts
    432
    Downloads
    0
    Uploads
    0

    Default Re: hybrid Closed Loop Stepper vs dmm servo

    At those speeds steppers will be more than adequate.

    I run my G0704 at exactly those parameters. Z is 160ipm, X,Y, at 180ipm, but I've run them faster.

    The vast majority of cutting is 60ipm or less. I've read about some have issues with preloaded double nuts and steppers though (i.e. stalling), they have a fair amount drag as I understand it. My machine is on single nuts, but I've repacked them to get down to around .0015" or less backlash on all axis.

    Closed loop steppers seems like a waste of money to me, simply because once everything was tuned up and working as it should my machine never loses steps. There have been pages of debate and flaming on the topic though.



  5. #5
    Member Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    3827
    Downloads
    0
    Uploads
    0

    Default Re: hybrid Closed Loop Stepper vs dmm servo

    Another vote for DMM. I've had good luck with their products, and they have great tech support. I haven't used the hybrid stepper systems.

    Jim Dawson
    Sandy, Oregon, USA


  6. #6
    Member JerryGarcia's Avatar
    Join Date
    Sep 2019
    Posts
    34
    Downloads
    0
    Uploads
    0

    Default Re: hybrid Closed Loop Stepper vs dmm servo

    The downside with servos is that you’re looking at reduction of some variety, and of course, cost. It also seems somewhat dicey to run a non linear rail machine at those speeds, and while I know many have done it and done it well, there certainly has to be some consideration for machine type and build. Hardened ways I imagine would be desirable for greater rapids.



  7. #7
    Member
    Join Date
    Jan 2012
    Location
    usa
    Posts
    67
    Downloads
    0
    Uploads
    0

    Default Re: hybrid Closed Loop Stepper vs dmm servo

    I have PM-25MV I’m converting, know servo are better I’m trying justify paying around $500 for closed loop stepper vs. $1000 for servos they really worth it? I don’t want to be disappointed in my purchase



  8. #8
    Member
    Join Date
    Dec 2015
    Posts
    432
    Downloads
    0
    Uploads
    0

    Default Re: hybrid Closed Loop Stepper vs dmm servo

    I personally think servos are a waste of money on a PM-25, G0704, etc.. Unless you install linear rails. Closed loop steppers are also an unnecessary expense. Start with spending your money on better ball screws, a kick ass spindle motor, oil setup, full enclosure, flood coolant, PDB, ATC, etc.. Even when I run my G0704 at 8k (2.2kw) I rarely cut over 90ipm (4 flute cob rougher in 6061). So asides from torque and faster rapids what do the servos gain you? Speaking practically, not too much, especially for a hobby machinist. For the record, as a hobby machinist myself, I make lots of money with my machine. I've done the cost benefit analysis, as well as dreamt about servos, many, many times. It just doesn't pan out, not for me anyways.

    Here is my machine.





  9. #9
    Member
    Join Date
    Jan 2009
    Location
    Australia
    Posts
    23
    Downloads
    0
    Uploads
    0

    Default Re: hybrid Closed Loop Stepper vs dmm servo

    Completely Agree with CL_MotoTech. I have two machines one with closed loop steppers the other with DMM. While I think the DMM better it is also overkill on this class machine.
    The biggest limitation I find with the PM25 is the rigidity of the column. From the closed loop steppers I have it running 40ipm easily. These combined with 1.1kw 3 phase motor are enough to induce deflection in the column on heavy cuts.
    Photo of my setup below.
    Regards,
    Michael
    hybrid Closed Loop Stepper vs dmm servo-img_3275-jpg



  10. #10
    Member
    Join Date
    Dec 2004
    Location
    USA
    Posts
    94
    Downloads
    0
    Uploads
    0

    Default Re: hybrid Closed Loop Stepper vs dmm servo

    Quote Originally Posted by rmachinist View Post
    I have PM-25MV I’m converting, know servo are better I’m trying justify paying around $500 for closed loop stepper vs. $1000 for servos they really worth it? I don’t want to be disappointed in my purchase
    I have the kit you show on https://www.ebay.com/itm/3NM-Nema23-...oHbalgQQ%3D%3D, the motors are good but the drivers are not. Using the motors and these drivers https://www.automationtechnologiesin...-servo-driver/ I get 420IPM on a PM-25MV.

    You can adjust acceleration etc., to get what you want.



  11. #11
    Member arizonavideo's Avatar
    Join Date
    May 2008
    Location
    USA
    Posts
    1167
    Downloads
    0
    Uploads
    0

    Default Re: hybrid Closed Loop Stepper vs dmm servo

    I have both the DMM and closed loop and regular steppers. The closed loop are a nice product. Get the 2.2Nm for the X and Y and the 4Nm for the Z.

    The DMM are faster and quieter but the closed loop are much quieter then regular steppers and dont loose steps.. For the smaller mills the 400 watt 60mm DMM are just over kill.

    Dave

    youtube videos of the G0704 under the name arizonavideo99


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

hybrid Closed Loop Stepper vs dmm servo

hybrid Closed Loop Stepper vs dmm servo

hybrid Closed Loop Stepper vs dmm servo