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IndustryArena Forum > CNC Electronics > Stepper Motors / Drives > Building my first CNC - final questions
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  1. #13

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    Re: Building my first CNC - final questions

    Thank you.

  2. #14
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    Re: Building my first CNC - final questions

    1000x1000? How much will the gantry weigh? What speed do you want to move at? These questions are more important at the beginning than what software/controller/stepper voltage will be used.

    I would bet that such a large machine will need you to increase the motor size to accommodate the inertial of the gantry and head.

    Just my $0.02

  3. #15
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    Re: Building my first CNC - final questions

    Quote Originally Posted by nejc1337 View Post
    Thanks, guys!

    @ger21, 1st answer: Ok, I understand that. But nothing "bad" can happen if I use 36 V instead of 62 V, right? And, if I understand correctly, it is then best to look for motors with lower inductance to efficiently use lower voltage?

    @ger21, 2nd answer: Okay, but from what I saw, even the cheapest controllers for use with UCCNC are a lot more expensive than some cheap Mach3 breakoutboards. I could use my old PC and connect everything through parallel port and use Mach3. I plan to use the CNC for hobby purposes mostly, so I can't afford to buy controllers for 200 $ or so.



    Do you see any problem in using this combination for my CNC:

    BOARD: https://www.aliexpress.com/item/3233...chweb201603_52

    DRIVERS: https://www.ebay.com/itm/Digital-DM5...AAAOSw~CVdExKj

    MOTORS: https://www.ebay.com/itm/EU-Free-Shi...oAAOSwBmhdchUr

    I'm using one of these type boards as Ger mentioned earlier. £5 ebay special.
    https://www.ebay.co.uk/itm/USB-Inter...oAAOSwufFcg3w1
    Using Mach3 on P Port
    An old Dell with WinXP service pack 3.

    The damn thing is faultless. (well unless I program the G-code stupidly )

    I'd like to eventually go to a UC400eth but don't really need to tbf.

  4. #16

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    Re: Building my first CNC - final questions

    What do you think about these motors with 1,8 mH: 57CM23 version: https://www.aliexpress.com/item/3299...chweb201603_52

    And pair them with DM542T drivers, should it be okay?

    And also, how do I know how powerful (Watts) power supply I need (I would buy 48 V power supply)?
    Thanks.

    EDIT: I didn't even see the last 2 answers.

    Thank you, @dazp1976, I will probably just buy this one.

    @maxspongebob, I must admit, I haven't really thought about this. So you think these kind of motors would not be enough? The router itself will be built from MDF and in the size of 1000x1000mm.

  5. #17
    Community Moderator ger21's Avatar
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    Re: Building my first CNC - final questions

    How are you deiving it? Screws?
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  6. #18

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    Re: Building my first CNC - final questions

    Yes, SFU1605 ballscrews (5 mm pitch) and SBR20 linear rails.

  7. #19
    Community Moderator ger21's Avatar
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    Re: Building my first CNC - final questions

    Then you definitely want the lowest inductance, and highest possible voltage.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  8. #20
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    Re: Building my first CNC - final questions

    It's probably a good idea to do some of the math that will define the limit of motion of the machine before you shell out the $ for parts.

    For instance, with a 1605 ballscrew, you are probably looking at a limit of 1000 RPM on the screw. My experience is that you can drive a long screw faster, but a cheap screw will probably start to flap at higher speed. So, that puts you at around 12 seconds to get from one end of the table to the other. If you want to go faster, you could use a 1610 screw, but the torque requirement would double.

  9. #21

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    Re: Building my first CNC - final questions

    I get it, thanks. I don't have any clue of what the torque should be because it's my firat time doing this. It's important to point out that most of the work will be done on a smaller scale, say 400x400mm so I think I shouldn't care so much for the slow speeds from one end to another.

    Also, can anyone please reply to this question from before:

    What do you think about these motors with 1,8 mH: 57CM23 version: https://www.aliexpress.com/item/3299...chweb201603_52

    And pair them with DM542T drivers, should it be okay?

    And also, how do I know how powerful (Watts) power supply I need (I would buy 48 V power supply)?


    Thanks.

  10. #22
    I think I can answer this question: stated voltage of DM542T is 20-50VDC. But 48V is too close to voltage limit, which most "Chinese" stepper drive cannot reach. 36V is safer. (We sell these parts, we have met similar problems before).

    A suggestion: https://www.aliexpress.com/item/3278...5b12ea0eKLnkJ1

  11. #23
    Quote Originally Posted by nejc1337 View Post
    I get it, thanks. I don't have any clue of what the torque should be because it's my firat time doing this. It's important to point out that most of the work will be done on a smaller scale, say 400x400mm so I think I shouldn't care so much for the slow speeds from one end to another.

    Also, can anyone please reply to this question from before:

    What do you think about these motors with 1,8 mH: 57CM23 version: https://www.aliexpress.com/item/3299...chweb201603_52

    And pair them with DM542T drivers, should it be okay?

    And also, how do I know how powerful (Watts) power supply I need (I would buy 48 V power supply)?


    Thanks.
    Power supply watt: drive voltage (V) you plan to use and multiple the motor current (A), then you will know the Watts you need for the stepper kit

  12. #24
    Mach3 board manual and software link refernce if anyone need this info:
    Mach3 software https://drive.google.com/open?id=1sa...rn_bMmTM8kvlSJ
    Mach3 manual https://drive.google.com/open?id=1ae...SiZkO_SynuNlD8


    Purchase link:
    Aliexpress: https://www.aliexpress.com/item/3283...3e073e83Xg8S1c
    Ebay: https://www.ebay.com/itm/113203360234

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