Computerized Index Wheel

Discussion in 'Woodturning Discussion Forum' started by billooms, Sep 5, 2011.

  1. bobbeaupre

    bobbeaupre

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    When I first saw you 20 x 130 gear reduction I though why did he use 20 on the motor end when there were smaller available. That answers that question keep the ratio an integer.
     
  2. bobbeaupre

    bobbeaupre

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    Hi there other Bill,
    As you can see from Bill Ooms reply: Yes, 20 x 130 is the same as 1 : 6.5.
    The stepper motor control is a Phidgets 1067_0 - PhidgetStepper Bipolar HC

    Here is the link if you want look at it: http://www.phidgets.com/products.php?product_id=1067

    The controller proprieties say the resolution is:
    Motor Position Resolution 1⁄16 Step (40-Bit Signed)
     
  3. billooms

    billooms

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    As I recall, the 20 was the smallest I could find at that time on a 1/4" shaft and 130 was the largest I could find.

    I used an MXL style of timing belt. Jon Magill has recently begun to use GT2 and GT3 style timing belts and gears. He says that it's easy to make your own gears if you have a rotary stage on a milling machine and a metal lathe. I'll probably look at this option for my ornamental lathe this summer some time.
     
  4. Doug Rasmussen

    Doug Rasmussen

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    Phidgets is new to me. A little Googling shows they have software drivers in most any language flavor you'd want.

    What I'm curious about is the output to the boards regular step and direction signals that could be used with any brand of stepper drive board? Or, is there other communication to the board making the software only usable with Phidgets boards?

    My reason for asking is I have a quantity of new stepper drives and motors left from automation projects in years past.
     
  5. billooms

    billooms

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    The stepper controller board (like the Phidgets 1067) connects directly to any compatible bipolar stepper motor and can drive up to 4 amps current with a supply voltage from 10V to 30V. The connection between the controller board and your computer is not the traditional step/direction from a parallel port, but is a USB cable that communicates with the driver software on your computer.
     
  6. bobbeaupre

    bobbeaupre

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    Well motor, control board, power supply and motor bracket showed up this afternoon. After a little reading to make sure I connected the four wire correctly to the control board, I fired up the control board test program from the manufacturer.
    Program accurately identified the board and acknowledged the motor attached. Test program ran the motor successfully.

    Next was to fire up the indexer program.
    It accurately identified the board. we are in business.
    Testing the motor on the arm of my chair here in the living room. Everything looks to be a go.
    Index plates load and motor indexes according to the program.
    can run the motor / index forward and backward.
    Return to zero, and can speed.
    Looks like I'm down to the gears and timing belt and building the fixture
     
  7. bobbeaupre

    bobbeaupre

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    Playing with sketchup today, revised the base a little smaller, waiting on some parts to arrive.

    Should be looking something like this

    Index Fixture-3.png
     
  8. Bill Boehme

    Bill Boehme Administrator Staff Member

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    Could you describe what the fixture does.
     
  9. bobbeaupre

    bobbeaupre

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    Bill this will be an indexing mainly for doing open segment work, I guess the big thing will be there will be no index plate. That will all be done with the computer and the stepper motor. The two rails on the left side are linear motion rails and the will be linear bearings in the index head. The head will go up and down manual as the rows get added to the bowl.
     
  10. bobbeaupre

    bobbeaupre

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    Base fixture built, waiting on rest of the parts

    IMG_20170215_151602236.jpg IMG_20170215_151617070.jpg
     
  11. Doug Rasmussen

    Doug Rasmussen

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    Looks good Bob. Things are coming right along.

    I'm still a little confused. Will the fixture be used in cutting segments or is it primarily to mark, like on basket weave bowl patterns?
     
  12. bobbeaupre

    bobbeaupre

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    It's going to be a glue up fixture for open segment bowls.
    Can also be used to layout for basket weave
     
  13. bobbeaupre

    bobbeaupre

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    Linear rails and bearings and segment platform are installed. Now I wait for the timing belts and pulleys.
    Looking good though. Still need to come up with a way of locking the segment platform in place.
    2017-02-17 17.41.07.jpg 2017-02-17 17.40.55.jpg 2017-02-17 17.41.38.jpg
     
  14. Bill Boehme

    Bill Boehme Administrator Staff Member

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    That clamping fixture looks like it might flex. I think that putting a rail on each side would eliminate the bending moment. But, maybe you're not thinking of using it as a vise. :D

    For holding, how about a third bar that is all-thread with a nut to tighten it down. Or, just sit a Vicmarc chuck on it. :D
     
  15. bobbeaupre

    bobbeaupre

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    Bill,
    No clamping. Think big brother to a Driskell Glue Up Jig.

    IMG_20161116_092832696_HDR.jpg IMG_20161116_092823530_HDR.jpg
     
  16. Bill Boehme

    Bill Boehme Administrator Staff Member

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    Oh, OK. You have to speak slowly and use simple words when talking about segmenting. I look at it and marvel, but I keep my hands in my pockets and just watch.
     
  17. Doug Rasmussen

    Doug Rasmussen

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    To lock the platform there might be a digital off/on output from your software to a solid state relay that could actuate some sort of mechanical or pneumatic clamping device.
     
  18. bobbeaupre

    bobbeaupre

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    Upper section of the fixture is now complete. Unless I want to get fancier with tray and such, but we'll wait until I'm actually do some work on it.

    IMG_20170219_140453648.jpg IMG_20170219_140540335.jpg

    Tomorrow the timing belts and pulleys will show up so I can finish the drive.
    Then I can punch a hole for the motor pig tail, and then I can hook up the computer and see if every thing works.
    Bad thing is Tuesday we leave for a week of vacation where it's warm.
    I'll be thinking open segment all week!! :D:D
     
    Last edited: Feb 19, 2017
  19. bobbeaupre

    bobbeaupre

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  20. billooms

    billooms

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    Congratulations! Now you can get back to woodturning!
     
    bobbeaupre likes this.

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