Computerized Index Wheel

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

  1. bobbeaupre

    bobbeaupre

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    Which is not much!
    I've been trying to compile Bill's software, I've tried two different computers, 6 different versions of Netbeans and three different versions of Java. I get different error messages on each combination!!

    I was hoping Bill had a windows version already complied, then I could play with it at my leisure.

    I could also feel more confident in ordering parts.
     
    Last edited: Jan 31, 2017
  2. Raul McCai

    Raul McCai

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    do your drivers work for ubuntu?
     
  3. bobbeaupre

    bobbeaupre

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  4. billooms

    billooms

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    The Phidgets people change their drivers as they add new products (or as required to keep their stuff working with OS changes). If you install a different version of drivers on your computer than what was used to compile the Indexer software things may not work. When you compile the Indexer software, you need to compile it with the same version of the library file (named phidget21.jar) that matches the Phidgets drivers on your computer.

    This is another reason that I abandoned the Phidgets approach.
     
  5. bobbeaupre

    bobbeaupre

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    Good to know I'll have to check what version I have installed
    Thanks, Bill

    The version I have install is Phidget21 - Version 2.1.8 - Build Feb 22 2016 11:45:54

    Name of the drivers is the same but I am sure it is a later version.
    Could this be the problem or does it just have to have the same name?
     
    Last edited: Feb 1, 2017
  6. bobbeaupre

    bobbeaupre

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    I see they have
    windows 64 bit back to version 2.1.6.20090317
    windows 32 bit back to version 2.1.6.20090317
    and
    OS X versions back to 2.1.3.2008114

    Can you tell me which version is the one you complied with, or at least which version is installed on your computer

    Thanks
     
  7. billooms

    billooms

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    The last versions I used had a date code of early 2014. I don't recommend using drivers that old. They might not work with current OS versions, might cause other problems, or may not work with the newer versions of the Phidgets boards. I no longer use any of the Phidgets boards so I have not done any updates.
     
  8. bobbeaupre

    bobbeaupre

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    Thanks I may install them just to see if I can compile.
    I have back down to version 2.1.8 March 2011 To see if that works.
    I'm also going to try version 8.02 of Netbeans

    Thanks Bill
     
  9. bobbeaupre

    bobbeaupre

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    Well will wonders never cease. I have been able to create both Windows and Mac installers!! :)
    Not only that but it installs and the program runs in Widows 10, I have sent the Mac install to a friend to see if that works.

    Now it looks like it's on to ordering some parts.

    Now I'm getting excited!!!:D :D :D :D :D
     
  10. bobbeaupre

    bobbeaupre

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    Going all in!! controller, power supply and motor are ordered! :eek: :eek: :eek: :D
     
    James Seyfried likes this.
  11. Bill Boehme

    Bill Boehme Administrator Staff Member

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    I'm following along with great interest.
     
  12. bobbeaupre

    bobbeaupre

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    Well the programs runs now on my Windows 10 Laptop and on my Windows 7 Laptop. It's a little finicky, there were quite a few warnings during the clean and build but nothing fatal. And there were warnings during the installer build. But most of those were caused by it being built on quite a bit older versions of java. Now that I have it so I know I can at least run it I can take my time and clear out the rest of the bugs. I'll wait on that until the board and motor show up, so I can verify that I can in reality control the motor with the program Then the fun starts
     
  13. bobbeaupre

    bobbeaupre

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    Motor and controller are to be here on Friday. :)
    In the mean time I'm working on the off lathe fixture. I'm making this for open segment bowl and layout for basket illusion, I see Tom Lohman also using it for closed segment.
    Drawing it up in Sketchup
    Index Fixture.png
     
  14. bobbeaupre

    bobbeaupre

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    Hi Bill,
    Looking at your gear reduction on the lathe spindle. Your stepper motor steps 1.8 and you were 20 x 130 on the gear reduction. From your experience was that sufficient with the index program?

    The stepper I have ordered steps 0.09 and was wondering if I needed to up the gear reduction?

    Thanks
    Bob
     
  15. Bill Boehme

    Bill Boehme Administrator Staff Member

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    I'm the other Bill, but, I would guess that torque would be the most important factor regarding the drive ratio. I don't think you could ever have too much holding torque nor step sizes too small. If you still have adequate torque and acceptable step size after reducing the drive ratio then I would think that you're OK.

    BTW, if you start your post with @billooms then Bill Ooms should receive an email notification of your post.
     
  16. bobbeaupre

    bobbeaupre

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    Hi there other Bill,
    The stepper motor I have ordered has
    Holding Torque 12 kg·cm - that relates to 26.4555 lbs at 1 cm (.4 inches)
    Rated Torque 11.2 kg·cm
    and the Step Angle 0.9° that's 400 steps per revelation.
    and the torque is before going thru any gear reduction.

    After gear reduction I should have the step angle down to 0.064131° with 5613.636 steps per revelation

    The original torque of the motor by itself I thought was sufficient for open segment work, I was just concerned about radial resolution and the cumulative error. Bill was the author of the source code and I did not dig deep enough in the code to see what his is doing in that regard.
     
  17. Doug Rasmussen

    Doug Rasmussen

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    fluted.JPG Hi Bob,

    I'm interested in what you're doing here. From your Sketchup drawing it's not clear to me how this off lathe fixture will function. Presumably it's to precisely index/rotate your workpiece in specified increments?

    The setup I use for off lathe indexing is similar to the small Sherline motorized rotary table. With the worm gear drive being able to hold position during cutting operations is not an issue. I use a NEMA 23 stepper controlled by an Arduino processor.

    http://sherline.com/product/3700-4-rotary-table/


    The attached pics are some of the kind of off lathe work I like to do using my indexing fixture..

    fluted.JPG spiral-inlay.jpg
     
    Last edited: Feb 8, 2017
  18. bobbeaupre

    bobbeaupre

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    Hi Doug,
    This will be a off lathe setup for open segment bowls. If you look in the center of the flat base you'll see a hole. That is where the axle for the face plate will be set. The axle will be turned by the stepper motor rather than using an index plate. The flat base off the rail will move up and down manually for line up segments.

    Hope that makes some sense.
     
  19. Bill Boehme

    Bill Boehme Administrator Staff Member

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    Bob, when you said that the drive train reduction is 20 X 130 does that mean the same thing as 1 : 6.5? I was trying to follow your description of the output step size and torque and couldn't match your results. Does the controller do half steps or full steps?
     
  20. billooms

    billooms

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    The 0.9 degree steppers (400 steps per rotation) will work just fine. It will give you finer resolution compared to the 1.8 degree (200 steps per rotation) motors. You set the stepper resolution and the gear ration in the Preferences portion of the software.

    Yes, 20 x 130 is the same as 1 : 6.5.

    You won't have to worry about any accumulation of error so long as the steps-per-rotation of the motor times the pulley ratio is an integer (i.e. not a fraction). So you will have 400 * 6.5 = 2600 which is fine. Your angular resolution will be 360/2600 = 0.138 degree which is close enough for any of our applications.
     

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