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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE
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  1. #1

    Join Date
    Jul 2018
    Posts
    10

    New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Hello,
    I am new to this board, CNC, Machining, ... well everything!
    My upcoming build:
    - Precision Mattews PM-30MV. Should arrive in a couple of weeks.
    - DMM DYN4 & 0.75KW Servo Motor for X,Y. Arrived
    - DMM DYN4 & 0.75KW Servo Motor for Z axis with Holding Brake. Arrived
    - DMM DYN4 & 1.8KW Servo Motor for Spindle motor. Arrived
    - CNC Aluminum brackets and double nut ball screws kit from ArizonaVideo99. Being made.
    - DMM power and control cables
    - DMM encoder cable for Spindle to Acorn
    - Acorn with Pro CNC software
    - Dell Touchscreen all-in one.

    Spent a LOT of time on youtube. Huge thanks to Youtube's Franko, ArizonaVideo99, CNC4XR7, martyscncgararge. These guys got me gluded to youtube. Right now, I am creating the wiring diagram, the hardest part for me. I am getting there. I have the control cabinet and most of the components to start wiring. Major thanks to DMM's Michael Tien for helping me with the Spindle Servo Motor and cables. Major thanks also to Franko and CNC4XR7 for hooking me on DMM and for the million videos on the PM-727 CNC conversion, most helpfull series of videos for newbies. Thanks also to martyscncgararge for a great variety of CNC videos, especially those on wiring.

    Now comes the hard part, getting the PM30 in the basement and actuall doing the conversion. I also have to build a base/stand, learn welding, learn fusion 360 ... I am ecstatic and nervous at the same time.

    Side note: I have ordered and received a brand new unopened Delta series M VFD (Single in/3 phase out 220 volts) and its matching braking resistor. Since I am going with DMM 1.8KWServo spindle, I don't need them anymore. Make me an offer if you want to buy them before they go on Ebay.

    I also may be interested in selling the Motor that will come-off the PM30MV. It is a 2HP 3000 rpm 220V single phase DC Brushless motor.

    __________________________________________________ _____________

    First complication to solve: Acorn and DMM z-axis with or without Holding brake

    Option 1
    DMM 86mm Frame DHT 0.75kW AC Servo Motor With Key

    Option 2
    DMM 86mm Frame, 0.75kW, medium inertia with +24VDC holding brake

    The diffrence between the two is the 24Volt holding brake. I ordered both, but I am returnign one of them,

    https://drive.google.com/open?id=12D...HNI6nnnDKtu7ed

    (I have to figure out how to insert the picture in the running text, it is not working, please see the link for now)

    Two Questions:
    1) Do I need a holding brake on the Z-axis Servo?

    2) The two DMM Servo motors have the same frame, power and wiring, except for the extra aviation plug (please see red arrow in picture). It is a 3 pin plug. How does this get wired to the Acorn board?

  2. #2

    Join Date
    Jan 2005
    Posts
    10132

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Quote Originally Posted by cnc-geek View Post
    Hello,
    I am new to this board, CNC, Machining, ... well everything!
    My upcoming build:
    - Precision Mattews PM-30MV. Should arrive in a couple of weeks.
    - DMM DYN4 & 0.75KW Servo Motor for X,Y. Arrived
    - DMM DYN4 & 0.75KW Servo Motor for Z axis with Holding Brake. Arrived
    - DMM DYN4 & 1.8KW Servo Motor for Spindle motor. Arrived
    - CNC Aluminum brackets and double nut ball screws kit from ArizonaVideo99. Being made.
    - DMM power and control cables
    - DMM encoder cable for Spindle to Acorn
    - Acorn with Pro CNC software
    - Dell Touchscreen all-in one.

    Spent a LOT of time on youtube. Huge thanks to Youtube's Franko, ArizonaVideo99, CNC4XR7, martyscncgararge. These guys got me gluded to youtube. Right now, I am creating the wiring diagram, the hardest part for me. I am getting there. I have the control cabinet and most of the components to start wiring. Major thanks to DMM's Michael Tien for helping me with the Spindle Servo Motor and cables. Major thanks also to Franko and CNC4XR7 for hooking me on DMM and for the million videos on the PM-727 CNC conversion, most helpfull series of videos for newbies. Thanks also to martyscncgararge for a great variety of CNC videos, especially those on wiring.

    Now comes the hard part, getting the PM30 in the basement and actuall doing the conversion. I also have to build a base/stand, learn welding, learn fusion 360 ... I am ecstatic and nervous at the same time.

    Side note: I have ordered and received a brand new unopened Delta series M VFD (Single in/3 phase out 220 volts) and its matching braking resistor. Since I am going with DMM 1.8KWServo spindle, I don't need them anymore. Make me an offer if you want to buy them before they go on Ebay.

    I also may be interested in selling the Motor that will come-off the PM30MV. It is a 2HP 3000 rpm 220V single phase DC Brushless motor.

    __________________________________________________ _____________

    First complication to solve: Acorn and DMM z-axis with or without Holding brake

    Option 1
    DMM 86mm Frame DHT 0.75kW AC Servo Motor With Key

    Option 2
    DMM 86mm Frame, 0.75kW, medium inertia with +24VDC holding brake

    The diffrence between the two is the 24Volt holding brake. I ordered both, but I am returnign one of them,

    https://drive.google.com/open?id=12D...HNI6nnnDKtu7ed

    (I have to figure out how to insert the picture in the running text, it is not working, please see the link for now)

    Two Questions:
    1) Do I need a holding brake on the Z-axis Servo?

    2) The two DMM Servo motors have the same frame, power and wiring, except for the extra aviation plug (please see red arrow in picture). It is a 3 pin plug. How does this get wired to the Acorn board?
    The Brake circuit normally is a separate circuit, that gets turned on when the power is turned on ( to Power the Servo Motor ) and off when the power is turned off to the servo motor, it does not have to be going through the Breakout Board, the Brake must be activated while and when the motor is power up, the Brake can not be locked when power is on the Servo Motor

    Do you need it that depends if your Z axes and Head moves down by it's self once the power has been turned off, if this happens then it is good to have some kind of brake on the Z axes
    Mactec54

  3. #3
    Registered
    Join Date
    Jan 2018
    Posts
    285

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    I wouldn't opt for brake myself, another thing that could go wrong.
    I don't see the need for it on the Z unless it drops on it's own. In which case just put a stronger gas strut on there.

  4. #4
    Registered
    Join Date
    Jul 2017
    Posts
    18

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Hi, correct me if I am wrong but I think I have read somewhere that brakes are also helpful to improve acceleration/deceleration. If I can understand it for the second, that's brakes purpose after all. I hardly grasp how it can help acceleration...

    Is it because torque rises before the brake is disabled? So there is a delay?

    Or is it in the cases of change of direction where, improving the deceleration phase, the branles shorten the change both in time and travel?

    May be the second one because now I think I've seen this in the context of 3D carving, to improve/accelerate Z axis mouvements.

    Envoyé de mon ONEPLUS A5010 en utilisant Tapatalk

  5. #5

    Join Date
    Jan 2005
    Posts
    10132

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Quote Originally Posted by silopolis View Post
    Hi, correct me if I am wrong but I think I have read somewhere that brakes are also helpful to improve acceleration/deceleration. If I can understand it for the second, that's brakes purpose after all. I hardly grasp how it can help acceleration...

    Is it because torque rises before the brake is disabled? So there is a delay?

    Or is it in the cases of change of direction where, improving the deceleration phase, the branles shorten the change both in time and travel?

    May be the second one because now I think I've seen this in the context of 3D carving, to improve/accelerate Z axis mouvements.

    Envoyé de mon ONEPLUS A5010 en utilisant Tapatalk
    You are mistaken, and if you read this, you have been fooled by someone that has no clue of what they are talking about, Brakes are of no use what's so ever for servo operation, when the main power is turn on the Brake has to be disengaged, when the power is turned off the Brake is locked, A Brake has no other function than holding an axes when the power is turned off
    Mactec54

  6. #6
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    Join Date
    Jul 2017
    Posts
    18

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Thank you for clarifying

    Envoyé de mon ONEPLUS A5010 en utilisant Tapatalk

  7. #7
    Registered
    Join Date
    Apr 2016
    Posts
    19

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Is there any news on the build? How are 0.75kW servos work on that machine?

  8. #8

    Join Date
    Jul 2018
    Posts
    10

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Quote Originally Posted by JKSniper View Post
    Is there any news on the build? How are 0.75kW servos work on that machine?
    I ordered the PM-30MV in early June, with delivery ETA of mid July. I still have not received it. I have been told by PM that I should expect delivery early November. The CNC kit is also not ready yet. A lot of waiting! Ounce things get going, it will be super busy. Until then, I am rebuilding a vintage southbend 9 lathe, almost done with it too.

    Sent from my SM-N910V using Tapatalk

  9. #9
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    Apr 2016
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    19

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Why did you decide for those drives? I've bought BF30 from Bernardo, which seems to be very similar to PM30 and it lies in parts right now. I'm stuck on deciding on drive for it. Check my thread if you have some recommendation for me - please!
    https://www.cnczone.com/forums/bench...67842-cnc.html

  10. #10

    Join Date
    Jul 2018
    Posts
    10

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Quote Originally Posted by JKSniper View Post
    Why did you decide for those drives? I've bought BF30 from Bernardo, which seems to be very similar to PM30 and it lies in parts right now. I'm stuck on deciding on drive for it. Check my thread if you have some recommendation for me - please!
    https://www.cnczone.com/forums/bench...67842-cnc.html
    I am new to this. So take what I say accordingly. Servos vs. Stepper Motors is a no contest in favor of Servos. When you can get decent servos at similar pricing to steppers, then to me, it was not even much of a decision. DMM tech servos and drives made a lot of sense to me. Plus I found many references and video on how to's. So I went with them. Not very scientific, plus it is hobby for me and I was willing to spend a little extra.

    Sent from my SM-N910V using Tapatalk

  11. #11
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    Apr 2016
    Posts
    19

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Someone (more experienced) just suggested me to use 1:3 belt drive (HTD or GT3) on those servos, because their nominal speed is 3000RPM, which is on 5mm ballscrews = 15m/min, which would destroy the machine and the castings etc. 1:3 ratio would give max speed of 5000mm/min, which is around 200IPM, which is kind of maximum what you want to run on such machines anyway... Also torque is much higher, precision gets higher, accelerations etc. etc. May be good option I guess.

  12. #12

    Join Date
    Jul 2018
    Posts
    10

    Re: New Build/PM30-MV Mill/Acorn/DMM DYN4-.75KW X/Y/Z SERVO/1.8KW DMM SERVO SPINDLE

    Quote Originally Posted by JKSniper View Post
    Someone (more experienced) just suggested me to use 1:3 belt drive (HTD or GT3) on those servos, because their nominal speed is 3000RPM, which is on 5mm ballscrews = 15m/min, which would destroy the machine and the castings etc. 1:3 ratio would give max speed of 5000mm/min, which is around 200IPM, which is kind of maximum what you want to run on such machines anyway... Also torque is much higher, precision gets higher, accelerations etc. etc. May be good option I guess.
    That does not make any sense to me. The Acorn CNC board will control the rpm of the servos. Their max rpm is not relevant. When I get a chance I will post link to the two youtube vids that convinced me to go with my setup. It is a very similar set up to the one I chose.



    Sent from my SM-N910V using Tapatalk

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