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Thread: Rotary Jig Prototype II

  1. #1
    Join Date
    Nov 2008
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    Default Rotary Jig Prototype II

    For anyone who is interested, I am still working on my concept of a rotary jig. I have built a second prototype which has some improvements. I first one is that the measurement procedure is now simpler. The jig is in the rear position for the dowel measurement and is pulled forward after the natural pause to install the bit. This required a major change in the design of the axle slides to include a slot for the bit "bob". Also, a lever was added to release the pressure on the dowel so that initial setup adjustments (rotate dowel, slide driver board, adjust height) are easier to make before and after the jig is clamped down in the machine.
    Attached Thumbnails Attached Thumbnails rot1.JPG   rot2.JPG   rot3.JPG   rot4.JPG  


  2. #2
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    As my first test of the jig I thought I would make a dowel out of a 2 by 2 sawed into an octagonal cross section. I used a hole saw to round the end to 2" used the 3/8" jointing bit to plane with 1/4" wide passes. As you can see, it can be done. It took a boring hour to do. I do not think that one even has to do this. A driver wheel and a rough sawn (8 or 16 sided) dowel could just be carved without having to make it round.
    Attached Thumbnails Attached Thumbnails dowel1.JPG   dowel2.JPG   dowel3.JPG  

  3. #3
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    Jul 2010
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    Dan, this looks amazing and i am in aw of your engineering talent. Great to see such great minds out here pushing the machine to its potential. Also not to take anything away from Ed Baker it is wonderful that the idea was conceived and can only excel from there.


    Stephen

  4. Default

    So it looks like with your prototype there are choices as to dowel sizes? What is the largest that it can carve?

  5. #5
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    Thanks Sallen.

    I have not tried yet, but it should do 4.5" diameter. Maybe more if it was really important and the jig is stripped down.

  6. #6
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    Jan 2009
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    What would be the smallest? Thinking Pens.
    Steve

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  7. #7
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    I never thought of pens. It must be possible. I was designing only down to an inch. You could use a drive wheel of an inch and carve down to the smaller diameter pen. The pattern would have to be stretched out on the "board", but that would be a good thing: fine precision. Maybe a good use for Jeff Birt's 1/32" carving bit. Interesting.

  8. #8
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    man, the leaps and bounds with which this forum takes things is impressive indeed... great job and I look forward to seeing more.

    One of these days I'm going to have to get round to making/buying a jig for myself (pun intended)

    Lawrence

  9. #9
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    PennStateInd.com had mandrels. You think one could be adapted?
    Steve

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  10. #10
    Join Date
    Aug 2010
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    Dan, how does the dust cup work with the round stock? Is chip buildup a problem? Joe
    Plea of Insanity for Addiction to ol' H-D Sporters

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