Wood Router - typical accelerations?


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  1. #1
    *Registered User* pjkumpon's Avatar
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    Default Wood Router - typical accelerations?

    I'm designing a 3 axis wood router. I would like to get feedback on two design aspects:

    1. typical acceleration profiles: I could guesstimate this - but I'd like get some feedback on what other's use on their DIY CNCs (for all three axes).

    2. loading: on the tooling: I'm not sure what a typical design load would be... how much force does it take to route through wood at 'typical' accelerations and speeds.

    I'm looking at a 20" x 30" x 5" table, wood structure with ball screw drives on all three axes (Two on the X, one on the Y, one on the Z). I'm targeting NEMA 23 motors, but wondering if I can get away with less than 350 oz-in.

    Any input would be appreciated.

    Thanks!

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    Community Moderator ger21's Avatar
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    Default Re: Wood Router - typical accelerations?

    1) I think most DIY machines use settings between 20-50 inches/s^2. Generally, the higher the better, but with most hobby level controls using trapezoidal (linear) acceleration, many people run into issues with the machine shaking at higher accelerations.

    2) It depends, but I doubt that you'd ever see more than 20 lbs of force, 30 max. That would be taking deep cuts, with 1/2" diameter tooling, at a pretty good rate.
    Spindle power, machine rigidity, holddown, all play a role here.


    I'm targeting NEMA 23 motors, but wondering if I can get away with less than 350 oz-in.
    Why would you want to go lighter on motors? What pitch ballscrews? What kind of speeds do you want?

    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)


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    *Registered User* pjkumpon's Avatar
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    Default Re: Wood Router - typical accelerations?

    Thanks for the quick feedback. Was thinking of going lighter on motors to save on the cost of the drivers associated with the larger torque motors. Honestly I haven't done much research into the cost deltas so maybe it's not that big of a deal. That said, I do have a few follow ups:

    3. What are typical linear speeds for a wood router?

    4. When selecting a stepper, should I consider other features (aside from NEMA size and torque)? Ie. low impedance, etc. ?

    Thanks again!



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    Community Moderator ger21's Avatar
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    Default Re: Wood Router - typical accelerations?

    What size is the machine, and how much are you looking to spend?


    3. What are typical linear speeds for a wood router?
    Depending on how much the machine costs, "typical" could be 50ipm for a lightweight hobby machine to 3000ipm for a high end industrial machine

    4) Inductance is the most important factor, with lower being better. 1.5mH-2mH would be best.

    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)


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Wood Router - typical accelerations?

Wood Router - typical accelerations?