Home Made 4th Axis with Harmonic Drive Unit! - Page 2


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Thread: Home Made 4th Axis with Harmonic Drive Unit!

  1. #13
    Gold Member widgitmaster's Avatar
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    Cool Now its time to make the fron fixture plate!

    Now its time to make the fron fixture plate!

    The 4th axis will be able to use a 3" diameter 3-jaw scroll chuck, and a 1/2" thick cast iron t-slot fixture plate, for mounting irregular shaped blocks and parts.

    first I needed to use the 8" rotary table for my milling machine, then I took a scrap block of aluminum from the shelf and drilled 4 mounting holes and counterbored them. Then I mounted the plate to the rotary table with 4 3/8-16 SHCS and some t-Nuts that fit the rotary table.

    Attached Thumbnails Attached Thumbnails Home Made 4th Axis with Harmonic Drive Unit!-fixtureplate-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0553-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0554-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0555-jpg  

    www.widgitmaster.com
    It's not what you take away, it's what you are left with that counts!


  2. #14
    Gold Member widgitmaster's Avatar
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    Cool

    Then I took the two cast iron discs that I had turned to size on my lathe late last night, and used a 3/4" diameter 2-flute end mill to cut a pocket in the aluminum plate to nest the cast iron discs.

    Then I drilled and tapped two 1/4-40 holes at 22.5 degrees from the centerline of my milling table. These are for the two little straps to hold the discs in the nest.

    Attached Thumbnails Attached Thumbnails Home Made 4th Axis with Harmonic Drive Unit!-000_0555-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0556-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0557-jpg  
    www.widgitmaster.com
    It's not what you take away, it's what you are left with that counts!


  3. #15
    Gold Member widgitmaster's Avatar
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    Cool

    Then I took a .1875 diameter carbide 4-flute end mill, and zeroed the end flush with the cast iron disc, then I plotted out my paths by cutting .002 deep where the slots will be.

    Two of the slots go completely across the disc, and four stop about 1" from center. this is to allow for the mounting holes to be drilled later.

    Then I set the depth of the endmill to .260", then I milled the 8-slots into the cast iron.

    Attached Thumbnails Attached Thumbnails Home Made 4th Axis with Harmonic Drive Unit!-000_0558-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0559-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0560-jpg  
    www.widgitmaster.com
    It's not what you take away, it's what you are left with that counts!


  4. #16
    Gold Member widgitmaster's Avatar
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    Cool

    Then I changed cutters, and put a small t-slot cutter in the mill's collet.
    The cutter is .375" diameter x .125".

    I then followed the same path for all 8 slots, using the small t-slot cutter.

    Attached Thumbnails Attached Thumbnails Home Made 4th Axis with Harmonic Drive Unit!-000_0561-jpg  
    www.widgitmaster.com
    It's not what you take away, it's what you are left with that counts!


  5. #17
    Gold Member widgitmaster's Avatar
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    Cool

    Next, I drilled 4 holed .5625" from center, around .192" diameter for a metric SHCS.

    Then I used a .315" diameter 4-flute endmill to cut the counter bore for the screw heads.

    Attached Thumbnails Attached Thumbnails Home Made 4th Axis with Harmonic Drive Unit!-000_0562-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0563-jpg  
    www.widgitmaster.com
    It's not what you take away, it's what you are left with that counts!


  6. #18
    Gold Member widgitmaster's Avatar
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    Cool

    Now we have a fixture plate that mounts on to the 4th axis harmonic drive unit. The same procedure was used to make a second disk.

    Total shop time: 3.5 hours each.

    Attached Thumbnails Attached Thumbnails Home Made 4th Axis with Harmonic Drive Unit!-fixtureplate-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0507-jpg   Home Made 4th Axis with Harmonic Drive Unit!-000_0564-jpg  
    www.widgitmaster.com
    It's not what you take away, it's what you are left with that counts!


  7. #19
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    Very nice work.
    What is a harmonic drive?????
    Cheers,
    Colin



  8. #20
    Gold Member widgitmaster's Avatar
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    Quote Originally Posted by yukonho
    Very nice work.
    What is a harmonic drive?????
    Cheers,
    Colin

    Harmonic Drive: Technology for high precision high reduction gear.

    This drive has a 50 to 1 gear ratio.

    Eric

    www.widgitmaster.com
    It's not what you take away, it's what you are left with that counts!


  9. #21
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    Default These are my stepper

    Hi,
    These are my stepper motor for you reference.Welcome to discuss with me mct.motor@msa.hinet.net


    Steven

    Attached Thumbnails Attached Thumbnails Home Made 4th Axis with Harmonic Drive Unit!-stepper-summary-jpg  


  10. #22
    Gold Member dertsap's Avatar
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    brillient !!!!
    nice to see a guy having fun !



  11. #23
    Registered RotarySMP's Avatar
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    Nice work. Does that harmonic drive have any backlash?

    Regards,
    Mark


  12. #24
    Gold Member BobWarfield's Avatar
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    Sorry to be late answering this last question. One advantage of harmonic drives is they have almost no backlash. There's quite a lot written about them on the Internet if you google. They come up pretty often on eBay fairly cheaply. Widgit's 4th axis is a nice compact design because of the harmonic drive.

    Best,

    BW



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Home Made 4th Axis with Harmonic Drive Unit!
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