bought a used 48" X 48" X 5" used router table - Page 2


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Thread: bought a used 48" X 48" X 5" used router table

  1. #13
    Registered travis_farmer's Avatar
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    Default Re: bought a used 48" X 48" X 5" used router table

    i pulled one of the servos (from on the gantry itself) to take a few measurements.
    the mount holes are 47mm centers, and the shaft has a 6.32mm diameter, and 6mm at the flat.

    what pictures or measurements can i take to help get the specs of these servos?
    I have some Gecko G320 drivers in my ebay watch-list, and i can get them via PayPal Credit. but i want to make absolutely sure they will work, and that i know how to hook them up before i spend credit.

    now, regarding the spindle. all the VFDs i found require 220/240Vac, at about 18 - 20A. that is a bit more than the current service to my "CNC trailer" (old camper, in process of conversion) can handle. actually, it is the whole of the service to the trailer (L14-20 connection). if i buy/make a mount for my Makita RF1101 router, other than feed rate, what compromises would i have to make to downgrade the router? (the 5HP spindle may be up for sale... )

    there is a remote possibility of upgrading the trailer power to 220V/50A service, but that would require a lot more money.

    ~Travis

    rebuilding a 48" X 48" X 5" (work area) router table.
    ReBuild not yet started.


  2. #14
    Registered Jim Dawson's Avatar
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    Default Re: bought a used 48" X 48" X 5" used router table

    I'm running a Porter Cable 7518 router motor on my 4x8. Like you, I don't have enough power in my shop to run the original 10 HP spindle. The only real difference is you just have to cut a bit slower. Other than that it works just fine.

    Regarding your servos, some good pictures would help. If you have a local motor shop maybe a trip over to them would be in order. They may be able to identify the motor, and should be able to figure out the voltage, most of them are rated at 140V, but I have seen them rated at 320V. Some of the newer ones are rated at 80V. The RPM is dependant on voltage, the torque is roughly dependent on the current. A call to the router manufacturer, if they are still around, might be helpful.

    I have brushed DC servos on my mill, they are rated at 140V, they were originally running on 100V, and I am now running them on 75V and they are working just fine, I don't need 400 IPM rapids, 150 IPM is just fine. I checked the voltage to them at 100 IPM and they were only being fed 37 volts to run at that speed.



  3. #15
    Registered travis_farmer's Avatar
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    Default Re: bought a used 48" X 48" X 5" used router table

    out of curiosity, i happened to find steppers with the correct mount, and shaft size, and 400oz/in (2.83Nm) holding torque. would those be a working fall-back, if the servos don't pan out? (also, i kinda like the sound of the steppers working...)

    I will take some detailed pictures after work of the servos.

    ~Travis

    rebuilding a 48" X 48" X 5" (work area) router table.
    ReBuild not yet started.


  4. #16
    Registered Jim Dawson's Avatar
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    Default Re: bought a used 48" X 48" X 5" used router table

    Don't try to buy steppers that fit the existing mounts. If you want to go with steppers, stick with standard NEMA frame stepper motors and modify the existing or build new mounts.



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    Quote Originally Posted by Jim Dawson View Post
    Don't try to buy steppers that fit the existing mounts. If you want to go with steppers, stick with standard NEMA frame stepper motors and modify the existing or build new mounts.
    If DC brushed, they migt have NEMA size already... The pilot would be 1.5" if NEMA23 OR 24 size...



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    Default Re: bought a used 48" X 48" X 5" used router table

    yes, the pilot is 1.5" on the servos, so it looks like they would work with the NEMA23 steppers.

    ~Travis

    rebuilding a 48" X 48" X 5" (work area) router table.
    ReBuild not yet started.


  7. #19
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    Default Re: bought a used 48" X 48" X 5" used router table

    Quote Originally Posted by travis_farmer View Post
    yes, the pilot is 1.5" on the servos, so it looks like they would work with the NEMA23 steppers.

    ~Travis
    Good, the bolt holes should be about 1.8" (47mm) or so...

    The other thing to check is that you can find steppers with the same shaft length, so that you can recycle the same couplings.



  8. #20
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    Default Re: bought a used 48" X 48" X 5" used router table

    bolt holes and shaft length look good

    only thing is, the stepper is 8-wire. it says it is so it can be configured bipolar, or unipolar, and gives the wire color connection chart.

    ~Travis

    rebuilding a 48" X 48" X 5" (work area) router table.
    ReBuild not yet started.


  9. #21
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    Quote Originally Posted by travis_farmer View Post
    bolt holes and shaft length look good

    only thing is, the stepper is 8-wire. it says it is so it can be configured bipolar, or unipolar, and gives the wire color connection chart.

    ~Travis
    Can also be wired bipolar series or bipolar parallel...



  10. #22
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    Default Re: bought a used 48" X 48" X 5" used router table

    yes, that is correct. i will likely use bipolar serial, as bipolar parallel requires a driver with a lot more current capacity than the inexpensive ones i have picked out.

    ~Travis

    rebuilding a 48" X 48" X 5" (work area) router table.
    ReBuild not yet started.


  11. #23
    Community Moderator ger21's Avatar
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    Default Re: bought a used 48" X 48" X 5" used router table

    What drives are you looking at?

    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)


  12. #24
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    Quote Originally Posted by travis_farmer View Post
    yes, that is correct. i will likely use bipolar serial, as bipolar parallel requires a driver with a lot more current capacity than the inexpensive ones i have picked out.

    ~Travis
    Check out Leadshine DM542E, sold at American Motion Tech. Super drive for the money, only $40 each, 48V.



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