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Spiral routing jig.
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Previously:
https://www.homemadetools.net/forum/...370#post131307
https://www.homemadetools.net/forum/...686#post178487
https://www.homemadetools.net/forum/...262#post134865
https://www.homemadetools.net/forum/...952#post148894
https://www.homemadetools.net/forum/...412#post146719
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.
There is a 'Router Lathe' that was common late last century that was used for making table and chair legs among other things.
Attachment 39965
The type I recall. Never saw one demonstrated; did changing spool ratios generate a different helix? How was dividing managed?Quote:
Originally Posted by NortonDommi
"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.
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
