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Stuart Batty On Tenons (Read 2,925 times)
 
Ron Sardo
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Stuart Batty On Tenons
Nov 10th, 2013 at 6:15pm
 
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I looked for part 1 without any luck


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« Last Edit: Nov 10th, 2013 at 6:16pm by Ron Sardo »  

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Re: Stuart Batty On Tenons
Reply #1 - Nov 10th, 2013 at 9:14pm
 
I just learned something. I had never heard of putting a chamfer on my tenons.   Recent ly I have had a couple snap off as he demonstrated.   I will have to see if this works for me.  My guess is it will.   Smiley
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Re: Stuart Batty On Tenons
Reply #2 - Nov 10th, 2013 at 10:47pm
 
Good video, that is the way I was taught to make tenons. I only have one set of jaws that are straight bore.
I use Vicmarc and Oneway chucks, they both need to have tenons bevelled to hold properly. And Yes, I have had some pop out of the chuck,  Angry, learning opportunity.
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Re: Stuart Batty On Tenons
Reply #3 - Nov 11th, 2013 at 8:55am
 
Len Layman wrote on Nov 10th, 2013 at 9:14pm:
I just learned something. I had never heard of putting a chamfer on my tenons.


Same here. I'm still trying to figure out why it works since the break would occur above the chamfer.
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Re: Stuart Batty On Tenons
Reply #4 - Nov 11th, 2013 at 12:35pm
 
Check here for a multitude of videos by Stuart. Multimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to Login or Register
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Re: Stuart Batty On Tenons
Reply #5 - Nov 12th, 2013 at 6:45am
 
Thanks Ron/Len.  Everything I have learned has been from videos.  I have added Stuart to my favorites.  I watched vid after vid last nite.  He makes it very clear!  Something I need to go back and watch again is when he works on the inside of the bowl he cuts only with the tip and trailing edge.  I have seen the tool rotated more and cutting with the tip and leading edge!  Also his 40/40 grind on his bowl gouge.  Good Stuff!
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« Last Edit: Nov 12th, 2013 at 6:48am by steve rost »  

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Re: Stuart Batty On Tenons
Reply #6 - Nov 12th, 2013 at 11:03am
 
Ron Sardo wrote on Nov 11th, 2013 at 8:55am:
I just learned something. I had never heard of putting a chamfer on my tenons.


Same here. I'm still trying to figure out why it works since the break would occur above the chamfer.


It makes no sense to me either, the physics don't work.
The only thing I can see it helping with is, eliminating a sharp edge that could catch on the jaw and potentially start a split as the blank is already coming out of the chuck.
Just my two cents
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Re: Stuart Batty On Tenons
Reply #7 - Nov 12th, 2013 at 12:24pm
 
It may also help with not having the dovetail so long that you are actually grabbing with the straight part below the dovetail.
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Re: Stuart Batty On Tenons
Reply #8 - Nov 14th, 2013 at 6:20pm
 
The 'chamfer' is another word for dove tail. Stuart uses the Vicmark chucks, and the dove tail angle is about 7 degrees. I use them also. This chamfer only works with dove tail jaws, and the angle on the tenon or recess has to match the angle of the chuck jaws. A shoulder is added stability. When using a recess, you have the shoulder on the inside. He does really clamp down tight on them. Also, it looked like the one tenon he broke off was black locust. The more brittle woods do break off more easily than the more medium or softer woods, which will 'bend but not break' better.

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Re: Stuart Batty On Tenons
Reply #9 - Nov 14th, 2013 at 6:48pm
 
Quote:
The 'chamfer' is another word for dove tail.

No, it's not.  Huh They are almost opposites
Look at 12:03 into the video. He points his pencil at the chamfered (outside) edge of the tenon. This is the confusing part I am referring to.
I fully understand the properties of using dovetail jaws, but I can see no real benefit to chamfering the edge of the tenon.
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Re: Stuart Batty On Tenons
Reply #10 - Nov 14th, 2013 at 7:08pm
 
I'm confused too. How does adding a chamfer to the tenon make it stronger? I understand why adding a shoulder makes a tenon stronger.

Maybe my definition of chamfer is wrong. Isn't a chamfer when a 90 degree edge is divided into two 45 degree edges?

Jenn
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Re: Stuart Batty On Tenons
Reply #11 - Nov 14th, 2013 at 8:03pm
 
He may be using the chamfer to reduce the thickness of the dovetail so the outer edge of the tenon isn't resting on the flat behind the jaw's dovetail.
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Re: Stuart Batty On Tenons
Reply #12 - Nov 14th, 2013 at 9:11pm
 
If I remember right he also mentions that with the chamfer it may come out of the chuck but not break the tenon so it would be re-chucked.  Perhaps the chamfer makes this possible.  giving it a chance to "escape" as opposed to break.
Any thoughts on that theory?
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Re: Stuart Batty On Tenons
Reply #13 - Nov 14th, 2013 at 10:36pm
 
Quote:
Perhaps the chamfer makes this possible.  giving it a chance to "escape" as opposed to break.
Any thoughts on that theory?

That was my thought Len
Quote:
The only thing I can see it helping with is, eliminating a sharp edge that could catch on the jaw and potentially start a split as the blank is already coming out of the chuck.

It doesn't make it stronger, just less likley to break
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Re: Stuart Batty On Tenons
Reply #14 - Nov 15th, 2013 at 10:42am
 
I think Len's got it!
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