G3 chuck spigot formation
#6
  
For the 50mm jaws, dovetail or straight sided spigot? The upper inside of the jaws appears to be dovetail, about 1/4 inch of it. The rest of the inside is straight.
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#7
  Re: G3 chuck spigot formation by Bill Mains (For the 50mm jaws, d...)
(12-30-2019, 11:41 AM)Bill Mains Wrote: For the 50mm jaws, dovetail or straight sided spigot? The upper inside of the jaws appears to be dovetail,  about 1/4 inch of it.  The rest of the inside is straight.
The Teknatool 50mm jaws are made to engage a mortise, not a tenon.  No interior wedging to steady up against a shoulder.  If you want a pure tenon chewer, get the spigot jaws,  or if you want a wedge inside and out, the 75s.
Better to follow the leader than the pack. Less to step in.
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#8
  Re: G3 chuck spigot formation by Bill Mains (For the 50mm jaws, d...)
(12-30-2019, 11:41 AM)Bill Mains Wrote: For the 50mm jaws, dovetail or straight sided spigot? The upper inside of the jaws appears to be dovetail,  about 1/4 inch of it.  The rest of the inside is straight.

If I have to use the Nova 50mm jaws on a tenon, then I cut the tenon straight - possibly with a small groove at the shoulder (depending on the hardness of the wood).
"the most important safety feature on any tool is the one between your ears." - Ken Vick

A wish for you all:  May you keep buying green bananas.
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#9
  Re: G3 chuck spigot formation by Bill Mains (For the 50mm jaws, d...)
The Nova 50 mm Jaws have a dovetail on both the inside and outside. The owners manual states that a recess is for projects such as bowls and platters and that a tenon is for endgrain projects like goblets and lidded boxes.
If you are using a tenon then the tenon should be straight not dovetailed or grooved. The dovetail at the top (inside) of the Jaws is meant to bite into the long grain fibers of your workpiece. Cutting the tenon with a dovetail or groove could lessen the gripping strength of the Jaws.


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#10
  Re: RE: G3 chuck spigot formation by Dusty Workshop (The Nova 50 mm Jaws ...)
(12-31-2019, 03:33 PM)Dusty Workshop Wrote: The Nova 50 mm Jaws have a dovetail on both the inside and outside. The owners manual states that a recess is for projects such as bowls and platters and that a tenon is for endgrain projects like goblets and lidded boxes.
If you are using a tenon then the tenon should be straight not dovetailed or grooved.  The dovetail at the top (inside) of the Jaws is meant to bite into the long grain fibers of your workpiece. Cutting the tenon with a dovetail or groove could lessen the gripping strength of the Jaws.
Unfortunately, without the narrow undercut directly under the face of the tenon, squeezing is as likely to push fibers under pressure in either direction.  Sort of a problem with all non-wedging designs, so make sure you have the tail engaged and are applying some pressure against the jaws when you squeeze.  Even there, no guarantees.
Better to follow the leader than the pack. Less to step in.
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