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The Growler

Discussion in 'CNC Mills/Routers' started by Scott Martinez, Feb 13, 2019.

The Growler

The Growler

Discussion in 'CNC Mills/Routers' started by Scott Martinez, Feb 13, 2019.

This machine is a heavy duty, moving gantry style CNC router. It uses Teknic ClearPath servo motors driving ballscrews and linear rails. The machine has 36" x 48" x 19" of travel with about 7" of clearance below the gantry.

CNC router gantry servo linear rail ballscrew ball screw DIY
  1. Scott Martinez

    Scott Martinez New
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    Scott Martinez published a new build:

    Read more about this build...
     
    #1 Scott Martinez, Feb 13, 2019
  2. gta18

    gta18 New
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    Hey those are monstrous motors! Been looking for servomotors that'll replace my nema 23's on my 1500x1500 build.

    Currently I have 2505 ballscrews that I think I oversized. Now I can only run the gantry maxed out without load at 3800mm/min, once Im cutting lets say 3/4 plywood, I can only go about 2400 without losing steps.

    Which motors did you go with? Do you mind posting the part numbers?

    Thanks!
     
    #2 gta18, Feb 13, 2019
  3. Scott Martinez

    Scott Martinez New
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    Not at all... I will upload a BOM once I get it finished. These are the motors that I used:

    X axis: CPM-SDSK-3411S-RLS
    Y axis: CPM-SDSK-3432P-RLS (x2)
    Z Axis: CPM-SDSK-2331S-RLS

    They all have a top speed of about 2400 RPM. The screws are 5mm lead which is a theoretical top speed of 12,000 mm/min.

    -Scott
     
    #3 Scott Martinez, Feb 13, 2019
  4. gta18

    gta18 New
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    Cool thanks! I can't wait to see your machine running!

    I haven't seen anyone use these motors.
     
    #4 gta18, Feb 13, 2019
  5. Project Hopeless

    Project Hopeless New
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    Scott,

    On your gantry/beam the linear bearings, are they threaded directly into the aluminum extrusion? What extrusion profile are you suing to support the bearings?
     
    #5 Project Hopeless, Feb 16, 2019
  6. Scott Martinez

    Scott Martinez New
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    Yes, the rails are bolted directly to the 80/20 extrusion. The profile is part number 40-4080. I'll be adding the BOM soon, which has all the part numbers.

    -Scott
     
    #6 Scott Martinez, Feb 16, 2019
  7. TurfnSurf

    TurfnSurf New
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    Wood couplings for the win?
     
    #7 TurfnSurf, Feb 17, 2019
  8. Scott Martinez

    Scott Martinez New
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    Wood couplings? No, the couplings are definitely not made of wood. :thumbsup:

    IMG_8572.JPG
     
    #8 Scott Martinez, Feb 17, 2019
  9. TurfnSurf

    TurfnSurf New
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    Perhaps my choice of language is poor - connectors, connecting the ballscrew bearing blocks to the aluminum channels.

    plywood connector.png vs plywood base.png
     
    #9 TurfnSurf, Feb 17, 2019
  10. Scott Martinez

    Scott Martinez New
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    Ah yes, I see what you mean. When I was first beginning to assemble the machine i thought "I'll make these parts out of wood for now, then replace them with aluminum parts after I prove out the design.". I may still do that, but only if the wood parts fail or if I find a good reason to. If I find that the bearing block is moving, that would be a good reason.
     
    #10 Scott Martinez, Feb 17, 2019
  11. TurfnSurf

    TurfnSurf New
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    At least in my application, I find that more of the movement comes from the poor quality chinese bearing blocks than the connection itself. I'm sure if I needed more torque, that I couldn't get away with wood. Seemed kind of funny (in a good way) to me for some reason when I saw your use of wood components. Sounds like a good plan, replace with aluminum at your leisure. Will be neat to see it in action, keep us posted! (now if only I remembered how to "follow" a project on this website...hmm)
     
    #11 TurfnSurf, Feb 17, 2019
    Last edited: Feb 17, 2019
  12. Project Hopeless

    Project Hopeless New
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    Scott,

    I have a build in the planning stages that looks very much like yours.

    I understand on the gantry the vertical board handles any Z deflection. How about X (bed travel), is there any applicable bowing of the beam under load? I was thinking of building a torsion box beam/gantry with extrusion mounts for the bearings. But if I don't need to that saves me some weight and time.

    I see you have upgraded the spindle. What depth of cut and in/min. rate can you run?
     
    #12 Project Hopeless, Feb 28, 2019
  13. Scott Martinez

    Scott Martinez New
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    So far I haven't pushed it very hard, so I haven't had any trouble with any parts of the machine moving under load. But now that you've mentioned it I am curious about how fast I could push it. What would be a good test? The max feed rate is going to be about 250 IPM.
     
    #13 Scott Martinez, Mar 1, 2019
  14. Scott Martinez

    Scott Martinez New
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    So I did a few test cuts yesterday just to get an idea of what this thing can do. I used a 1/4" 2 flute upcut router bit in a piece of 2 x 6 construction lumber. These were the cuts I made:

    0.050" deep at 200 IPM
    0.250" deep at 150 IPM
    0.500" deep at 100 IPM
    0.750" deep at 50 IPM
    1.000" deep at 25 IPM

    The only issue I saw was a lot of chip re-cutting at the two deepest cuts. I assumed this was caused by the fact that there was just no place for the chips to go. The machine did the cuts with no problem, no slowing of the spindle speed or any other signs that this was too much for it.

    I was thinking that a good test would be to cut a series of circles at different feed rates and DOC. If there is any significant flexing of the gantry then this would result in the circles being smaller in one direction than the other.

    -Scott
     
    #14 Scott Martinez, Mar 2, 2019
    GrayUK likes this.
  15. mohamed1010

    mohamed1010 New
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    mr scott
    how i get the mdf cutting plan to prepare to get this machine
    [email protected]
     
    #15 mohamed1010, Mar 18, 2019
  16. Scott Martinez

    Scott Martinez New
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    There is a full 3D model and bill of materials available under the "Files and Drawings" section of this build.

    -Scott
     
    #16 Scott Martinez, Mar 18, 2019

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