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Thread: Spiral routing jig - GIF

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    Supporting Member Altair's Avatar
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    Supporting Member Toolmaker51's Avatar
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    Because there seems to be only one lead on the spiral, or 5 or 6 start screw and not disengaged, dividing is achieved by the little rotary table on the face plate.

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    Supporting Member NortonDommi's Avatar
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    There is a 'Router Lathe' that was common late last century that was used for making table and chair legs among other things.

    Spiral routing jig - GIF-router-lathe.jpg

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    Supporting Member Toolmaker51's Avatar
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    Quote Originally Posted by NortonDommi View Post
    There is a 'Router Lathe' that was common late last century that was used for making table and chair legs among other things.

    Click image for larger version. 

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    The type I recall. Never saw one demonstrated; did changing spool ratios generate a different helix? How was dividing managed?
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    Supporting Member NortonDommi's Avatar
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    "did changing spool ratios generate a different helix? How was dividing managed?"

    I spent some time trying to find the instructions,(with diagrams),that I have somewhere without success. From memory the drive plate had multiple divisions like a dividing plate and there were different size pulleys to alter feed rate. They had a sliding guide bar for doing tapers and the more complicated ones could trace curves as well.
    Not a lot to them but turned out lovely repeatable work fast.

    I only know this because I had a friend,(now passed),who made high end custom furniture and he used one to great effect.
    Last edited by NortonDommi; Jun 30, 2021 at 03:41 PM. Reason: spelling mistake.

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    Supporting Member Frank S's Avatar
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    I think this is one adaptation my ShopSmith is lacking. If I ever decide to get into turning wood again I might consider getting a ball lead screw an assortment of cogwheels and a timing belt make a rotary index and a router mount then, Humm not such a far fetched idea at that maybe my sis needs to spirally turned balusters for her front porch



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