My first CNC specs, what do you think?


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    Default My first CNC specs, what do you think?

    Hi guys, been lurking around the forum for a while since recently I finally decided to build my CNC.

    I will be building a Joe 2006 R2 and will be using it to cut mostly MDF up to 25mm (about 1").

    And also will be the standar build (1/2" 10 leadscrews, everything in Joes' manual)

    Steppers and such will be bought from Automationtech and will be one of these: Decision went from the 3rd choice to the 1st one because initialy I thought to get in less trouble with the wiring with the Gecko, but then I saw the 2nd choice and though "same price but 66% more power", but then I saw the 1st choice and a difference in price but much better motors (2.5 inductance, nice!).

    1st choice and probable purchase 2nd choice 3rd choice
    (3) KL23H2100-50-4B 570 oz-in stepping motors, NEMA 23
    Phase 2 - Inductance 2,5 - Current 5A - Resistance 0,6om - Voltage 3V
    (3) KL-6050 Bipolar Stepper Motor Driver
    (1) 48VDC /12.5A Power Supply 110VAC/220VAC
    (1) C10 Breakout board
    (1) 5V power supply 110VAC/220VAC
    (3) NEMA23 570 oz/in 3.5A 1/4” Dual Shaft Stepper Motor (KL23H2100-35-4BM)
    Phase 2 - Inductance 6.4 - Current 3.5A - Resistance 1.2m - Voltage 4.2V
    (3) KL-6050 Drivers (5 Amp 24-60 Volts)
    (1) 48VDC/10A Power Supply 110VAC/220VAC
    (1) C10 Breakout board (E-Stop, limit switch can be wired)
    (1) 5V power supply 110VAC/220VAC
    3 pcs NEMA23 KL23H2100-35-4A(1/4” Single shaft with a flat) 381 oz-in
    Phase 2 - Inductance 2.8 - Current 3.5A - Resistance 0.73ohms - Voltage 2.55V
    1 pcs G540 4 axis driver with 4pcs DB9 connectors
    1 pcs KL-350-48 48V/7.3A 115V /230VAC power supply
    Price $489.95 Price $428.35 Price $439.95

    For the router, I will likely buy a Hitachi M12VC ($116 on amazon), but have also considered a Dewalt DW618 and Makita RF1101.

    So, do you consider that if I get 1st choice from AT, the Hitachi router and build a Joe 2006 R2, I will be able to get decent cut speed and rapids for MDF? What about other matherials (acrylic, and some harder kinds of wood)?

    Thanks in advance!

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    Default Re: My first CNC specs, what do you think?

    The lower inductance motors in choice 1 will perform better than the choice 2, but I suspect choice 3 will be the fasted due the lower motor inertia. Other can chime in though.

    Last edited by eman5oh; 09-15-2015 at 03:29 PM.
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    Default Re: My first CNC specs, what do you think?

    Quote Originally Posted by eman5oh View Post
    The lower inductance motors in choice 1 will perform better than the choice 2, but I suspect choice 3 will be the fasted due the lower motor inertia. Other can chime in though.
    Thanks for the reply! I ouldn't find an answer googling, so what is motor inertia and what do you take into account to say that those motors have lower inertia?



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    Default Re: My first CNC specs, what do you think?

    You won't get good speeds with any of those motors as long as you're using 1/2-10 leadscrews.

    I would go with the 3rd choice, and 1/2-8 2 start or 4 start screws (or 1/2-10 5 start).

    Gerry

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    Default Re: My first CNC specs, what do you think?

    Quote Originally Posted by ger21 View Post
    You won't get good speeds with any of those motors as long as you're using 1/2-10 leadscrews.

    I would go with the 3rd choice, and 1/2-8 2 start or 4 start screws (or 1/2-10 5 start).
    Hey ger, thanks for the input.

    The leadscrew change you suggest is kind of budget killing for me. I could possibly go with the 1/2 10 5 start (about $39 on ebay, do you know where I can get them cheaper?) but where can I buy the nuts for those? I cant seem to find them...

    Also, carbon steel, stainless steel, alloy steel?



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    Default Re: My first CNC specs, what do you think?

    dumpstercnc.com

    Gerry

    UCCNC 2017 Screenset
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    JointCAM - CNC Dovetails & Box Joints
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    Default Re: My first CNC specs, what do you think?

    And how many of the Anti-backlash Leadnuts would I need? 3?

    And I wouldnt need this two pieces



    And I should modify the piece that held the acme nut into something like this?



    Are they placed in the same position as from picture 1?

    Attached Thumbnails Attached Thumbnails My first CNC specs, what do you think?-hpim3384sm-jpg   My first CNC specs, what do you think?-anti-backlash-nuts-jpg  


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    Default Re: My first CNC specs, what do you think?

    Never built a Joe's (or actually seen one) but, yes, I think 3.
    Yes, it should replace those other two nuts. And I'd expect it to go in the same location.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


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    Default Re: My first CNC specs, what do you think?

    I did not look the motors up that you listed but suspect with 570 oz in are most likely triple stack and the 381 oz in are most likely double stack. As a general guide, physically smaller motors will run better in higher speed aplications. To verify this you would need to look at the speed torque curves when comparing the motors. I think you will see at high speeds the smaller motor will have more torque availbe than the larger motor.You will need to figure out the operating speed you want to use most and then compare the torque available form the different motors.

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    Default Re: My first CNC specs, what do you think?

    I couldn't find the curves for the 381 so as both ger and eman suggested that this would be better, I will choose the 3rd kit.
    The thing is that AT offer the kit with dual shaft or single shaft. From what I've read, dual shaft allows manual rotation or encode or to put a damper to avoid stalling (expensive) but that wont be needing it (I think). So I guess I will go for the single shaft choice.

    On the other hand... For the moment I was planning to upgrade to 1/2-8 2 start, but maybe I can extend my budget to 1/2-10 5 start or 1/2-8 8 start (about 40 at mcmaster). Which would be better?
    Ger I read in some other post that 1/2-8 8 start would have less whip in the long axis (64"), am I right?

    Regards!



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    Default Re: My first CNC specs, what do you think?

    Running a 1/2" screw that is that long would definitely by better to have more starts to slow the screw down, just remember you are lowering your resolution and force transmitted as well.

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    Default Re: My first CNC specs, what do you think?

    Wouldn't lower resolution be fixed with microstepping?



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    Default Re: My first CNC specs, what do you think?

    Yes and no. Yes the motor will resolve to about 10 micro steps, but only when unloaded. As a general rule when designing stepper system I use the full step resolution for the calculations. This is a bit of a conservative approach, but it works for me.

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    Default Re: My first CNC specs, what do you think?

    Thanks for the help eman5oh.

    So I guess that I will have to go with the 1/2-10 5 start, because I cant seem to find 1/2-8 8 start anti backlash nuts as dumsptercnc doesn't make them anymore.

    Anyone know where I can get 1/2-8 8 start anti backlash nuts? Google gave no results



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    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


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    Default Re: My first CNC specs, what do you think?

    Impossible for my budget



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    Default Re: My first CNC specs, what do you think?

    I don't think you'll find anyone making 8 start nuts.
    You can either make your own, or go with 1/2-10 5 start, or 1/2-8 4 start.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


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My first CNC specs, what do you think?

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