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Thread: Tips on proper lay out for the jig

  1. #1
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    Default Tips on proper lay out for the jig


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    What are the recommended techniques for setting up the design for the rotary jig to reduce a possible broken bit? This is a question I've asked myself as I am sitting here laying out my first carve. The software already prevents a pattern or design from being place over/on to the part off ends to eliminate carving into the jig which is a great thing. One thing I question is the "part off" indent actually carved?

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ID:	68544 in this layout the patterns are placed far enough away from the part off and drops straight down into the pattern area.

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ID:	68545 This uses a carve region with a feather to ease the bit into the carving area.

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ID:	68546 On this I set the part of dia. to 2" and no lead in carve region.


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ID:	68547 This one still has the 2" part off and a carve region with a feather.

    My choice would be either that had the feathered carve region as they ease the bit into the carving area.

    Looking for others thoughts on my line of thinking!
    RingNeckBlues
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  2. #2
    Metallus's Avatar
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    I suggest setting the part-off to the same diameter as the max depth of the carved area next to it. The part-off is 0.1" long. The part-off will taper from the top of the board to its diameter. This helps create a ramp into the rotary.

    Feathers on the main pattern tend to goof with the end-to-end seam.

    Carves that don't occupy the entire surface (length of rotary - 0.5" south keep-out zone - 0.3" north keep-out zone - 0.1" south part-off - 0.1" north part-off) will not ramp-in & overcarve the rotary. It will dive straight down and carve to 100%.

    When I say "ramp-in" in the paragraph above, I mean a slow entry into the wood along the length of the carve -- it calculates the highest & lowest points of the carve and slowly steps down along 1/2" of the carve until reaching the bottom. When it overcarves, its cleaning up the ramp-in.
    Last edited by Metallus; 03-27-2014 at 10:52 AM.

  3. #3
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    I think I follow you on this, but lets double check to verify.

    On this one I set the part off to 1.5" dia. (close to the same depth as the pattern) and put a .450 depth carve region on the ends with no feather.
    Attached Thumbnails Attached Thumbnails Part off dia 5.PNG  
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  4. #4
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    Quote Originally Posted by Metallus View Post
    When I say "ramp-in" in the paragraph above, I mean a slow entry into the wood along the length of the carve -- it calculates the highest & lowest points of the carve and slowly steps down along 1/2" of the carve until reaching the bottom. When it overcarves, its cleaning up the ramp-in.
    Now I understand why it over-carves. I did notice that when the carving first began that it seemed kind of shallow but, the carving came out great.
    Steve

  5. #5
    Metallus's Avatar
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    Floyd, I'm not entirely sure of where the .45 region is, but I see nothing that appears wrong on your pattern.

  6. #6
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    Quote Originally Posted by Metallus View Post
    Floyd, I'm not entirely sure of where the .45 region is, but I see nothing that appears wrong on your pattern.
    It is on the ends...

    Now as soon as I get my plumbing problems fixed I will be carving....
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    RingNeckBlues
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