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Advice on my electronics?

Discussion in 'CNC Mills/Routers' started by Retrosmith, Oct 29, 2017.

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  1. Retrosmith

    Retrosmith Journeyman
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    I've sold my X-Carve and am planning to build my first CNC. I've got the mechanicals handled I think, but I'll admit the electronics are a little out of my comfort zone. I was hoping someone could look at the list I've put together and let me know of any possible conflicts, issues or better suggestions.

    First off, the machine: simple 1000 x 1000 cartesian style 3-axis CNC router, controlled from a Windows PC. It will require five stepper motors, as the Y will have dual motors and I'm using the entire X axis as the Z carriage, so two motors there also. All-aluminum construction with C-beam and 20x80 rail. I'll be starting out cutting hardwoods and Corian (solid surface). Clean precise cuts are the primary objective but obviously the faster I can make them the better. I plan to move on to cutting aluminum copper and brass once I have the machine control down, and I don't want to have to upgrade to do it.

    Electronics:

    Arduino Uno (link)
    KL-8060 stepper drivers (link)
    NEMA23 2.8A stepper motors, 425 oz/in (link)
    48V/12.5A switching power supply (link)
    1.5KW water-cooled 110V spindle w/KL-VFD-15 inverter (link)
    I do not have 220V available but I do have a single 30-amp 110 circuit dedicated to the machine.

    The motors may be overkill, I'm not sure. The machine I just sold was equipped with 140 oz/in NEMA23s. the 425s may be overkill. What advantage is there to such massive torque, assuming it's properly fed?

    Any observations or advice would be greatly appreciated. I'm placing the order for the mechanicals tonight, and obviously it will be a while before I need all of the electronics. Just trying to get a handle on all of it.

    Thanks!
     
    #1 Retrosmith, Oct 29, 2017
    Last edited: Oct 29, 2017
  2. Joe Santarsiero

    Joe Santarsiero OB addict
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    I like those drivers. They're a bit extreme though.
    What about these instead High-Torque Stepper Motor, Stepper Motor, Driver, Stepper Motor kit, DC Servo Motor, DC Servo Motor kit, Stepper Motor Power Supply, CNC Router, Spindle, and other Components. Stepper Motor | Stepper Motor Driver | CNC Router | Laser Machine | 3D Printers For Sale

    I think the 1.5kw spindles are a bit overkill for profile extrusion based hobby machines. The .8 seems to be a better balance between weight and power. I'm biased though as I own a .8kw and its been more than I've personally needed(Plus I did some FEA around it during the machine design). The cost difference between the two is nil so I don't blame many hobbiest for skipping over the .8kw.
    Id like to hear more usage feedback from 1.5kw owners. So far it seems like beefing up the spindle axis for the weight makes up the meat of conversation around them.

    It's nice you have a 30A circuit. You can add a nice dust collection unit.

    A lot of forum members here are using common 1-1.5hp palm routers on their OX or cbeam and making greatness. A .8kw(1hp) spindle with a good vectoring vfd will out perform a 1.5hp brushed router any day.

    Just my 2c.

    Joe
     
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  3. Retrosmith

    Retrosmith Journeyman
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    Appreciate the input! I'll admit that I know very little about the drivers, why would you recommend this one over another?

    I've also never used a spindle, been using the same 1.5hp palm router you mentioned. I chose the 1.5kw because (as you mentioned) the price difference wasn't that much, and the selection of higher-powered 110V spindles isn't all that great. I was also able to source spindle and VFD together.

    Nothing has been purchased as yet. I'm at the common point where I want it to be able to do certain things now, but plan to be doing more with it later and don't want to have to upgrade it then. Of course, knowing myself as well as I do, I'll upgrade it then anyway. I can't seem to leave anything well enough alone.
     
  4. Joe Santarsiero

    Joe Santarsiero OB addict
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    The drivers I recommended are more than enough to drive those 2.8a motors and are $23 less. Unless you want to build another machine with nema 34s you'd be throwing $90 away on the 6a drivers. You could put that into a good power cable for the spindle. I highly recommend this cable:
    Beldon VFD cable
    It's good stuff.

    Spindles are pretty nice. For the little extra hastle of setting them up and for the money it sure is nice to hear yourself think.
    Buy a silver killcoil from Amazon. Use distilled water. Stick the killcoil in the end of one of the cooling tubes. I've done this and have used the same water for 2 seasons now...no growth in the water.
    Also, check the ground in the spindle. Theyre usually not attached to anything internally.
     
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  5. Retrosmith

    Retrosmith Journeyman
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    Excellent point.


    Bookmarked and added to the list.


    I've been water-cooling PCs for several years and always used silver as a biocide. That part I've got covered. :)


    Noted, and thanks again!
     

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