internal tenon?
- Thread starter mattyts
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Silverbirch
Established Member
Not sure exactly what you mean by an internal tenon. Do you mean a recess in the bottom of a bowl, for example, where the jaws expand into the recess and grip it securely?
If the jaws have a dovetail profile on the outside, hollow a recess of a suitable diameter, a little deeper than the depth of jaws to enable them to expand into it and have the shoulder sit on the outside edge of the recess. The recess will need to be given a dovetail profile too, to match that of the jaws. A few more details about exactly what you are trying to do, what kind of chuck and jaws you have etc would help us to answer your question.
Ian
If the jaws have a dovetail profile on the outside, hollow a recess of a suitable diameter, a little deeper than the depth of jaws to enable them to expand into it and have the shoulder sit on the outside edge of the recess. The recess will need to be given a dovetail profile too, to match that of the jaws. A few more details about exactly what you are trying to do, what kind of chuck and jaws you have etc would help us to answer your question.
Ian
Silverbirch
Established Member
You`re too quick! I edited my post, just after posting (see above), but you`d already replied!
Hope what I`ve written makes sense now.
Ian
Hope what I`ve written makes sense now.
Ian
sammo
Established Member
Hi
This YouTube link https://www.youtube.com/watch?v=PzG70rAJRIQ --- goes into some detail about the pro's and con's of using your chuck in expansion mode
Chris
This YouTube link https://www.youtube.com/watch?v=PzG70rAJRIQ --- goes into some detail about the pro's and con's of using your chuck in expansion mode
Chris
Silverbirch
Established Member
P.S. Many turners would suggest that a tenon which the jaws close onto, gives a better grip than a recess which the jaws expand into.
Ian
Ian
As I dont have a way of finishing the bottom of a bowl just yet,I'm planning on using a recess to turn them so i can finish and display the bowls while still having the opportunity to finish the bottom when I get the facilities to do so,hope this makes sense.
Brianp
Established Member
Have you tried a jam chuck? You turn a piece of scrap timber so that the head side fits the chuck and the tail side then matches the interior of the bowl. Bit of paper towel between the jam chuck and the bowl then bring the tailstock back up to the centre of the bowl's underside at which point you can carefully turn away the tenon or otherwise clean up the bottom.
Keep the speed down and the cuts light, and towards the headstock as much as possible. If you're careful you'll be left with a reasonably small nib that you can just carve away, or with your chuck recess, a neater edge.
Hope that makes sense...
Brian.
Keep the speed down and the cuts light, and towards the headstock as much as possible. If you're careful you'll be left with a reasonably small nib that you can just carve away, or with your chuck recess, a neater edge.
Hope that makes sense...
Brian.
monkeybiter
Established Member
i think that dovetail profile is less of a requirement than is often assumed, wood is easily compressible and if you create a parallel tenon or recess then when tightened up your jaws will compress the wood and create their own best tight fit.
Always re-check the tightness periodically.
Always re-check the tightness periodically.
YewTube
Established Member
Put a skew chisel flat on the rest and use the point as an angled scraper.mattyts":j93c6yg1 said:
Bill
finneyb
Established Member
mattyts":1puc72u8 said:
Oh yes you do !!!
See the Wyomingwoodturner http://www.youtube.com/watch?v=Vdn0PdySkh4 I do like his videos, once you get used to his pace.
Brian
