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Tenon Size Jig

Randy Anderson

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I don't use the tenon to form the foot on my bowls so 99% of the time use the same size tenon based on bowl size - 3 1/4" for large bowls or 2 1/4" for smaller ones to fit one of my two chucks. One with large jaws and the other with smaller jaws. To make it easy I simply made a small wooden block with a slot that fits a standard carpenter pencil that when placed on my tail stock collar it marks out the right sized circle for me to cut the tenon size to. Same jig just flip it over for the different sizes. Hold in place and spin the bowl. Done. Quick and easy although I find that just out of habit I can usually get it very close without the jig but better sure than remounting if not right. Likely a common method but hey, someone might not have one.

I searched first and couldn't find a similar post. Sorry if a repeat of something many already use or know.
 

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I just cut a scrap of oak wood - about 3 inches wide, 6 inches long, cut a 2-1/4 inch notch with a bevel to it to match dovetail of my jaws and just use that like a caliper til the wide side just slips over, then I can cut my dovetail and use the block to get a perfect angle.. so, similar.. I can usually eyeball the diameter fairly close then start checking with my measuring block..
 
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I just cut a scrap of oak wood - about 3 inches wide, 6 inches long, cut a 2-1/4 inch notch with a bevel to it to match dovetail of my jaws and just use that like a caliper til the wide side just slips over, then I can cut my dovetail and use the block to get a perfect angle.. so, similar.. I can usually eyeball the diameter fairly close then start checking with my measuring block..
Mind posting a pic?
 

hockenbery

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searched first and couldn't find a similar post. Sorry if a repeat of something many already use or know.
Randy certainly worth posting here. nice presentation.
It’s a concept that has been around since the ONEWAY live center came out with the non rotating bearing housing.


I cheat using the oneway center for green wood. I just cut an inch out from the threaded part by eye which is 5/8” that gives me a 2.5” tenon +/- an 1/8. i just got really good a seeing an inch. That 2.5” tenon will always dry to one that has a 2” tenon inside when turned round for remounting The dried bowl.
 

Randy Anderson

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I was certain it wasn't a new idea, I'm not that smart and it's sorta obvious but since I didn't see a direct post I remembered when I first started - obvious solutions weren't so obvious.
 
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Glenn Lucas has a pointer arrow type thing that is attached on the away side of his tailstock. 2 pointers, one smaller and one larger. He turns the tenon down till it likes up with the pointer. Maybe I can find the video, just saw it some where....

robo hippy
 
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Here's my take on tenon/recess sizing jigs. Each one fits over the 3/4" threads on my live center and has two screws protruding through ... the inside for a tenon, the outside for a recess.
TenonRecess_01.jpgTenonRecess_02.jpgTenonRecess_03.jpgTenonRecess_04.jpg
 
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I made a pair a little smaller in cross section than Randy's, one for my larger jaws and one for my smaller. I just rest the pencil on top of the jig. Each block of wood is rectangular, with one thickness corresponding to green wood and the lesser thickness for dry wood. That helps me when re-turning the tenon on the dried blank.

I glued a rare earth magnet into one side of each, which helps stabilize them on the live center, but more importantly, I can stick them to the lathe and they're always handy.
 
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Axminster tools in the Uk produce this tool called a woodturnig speed sizer the tool was inspired by a blind woodturner

You could use the same principle to make a similar tool for your own jaws

Please view thumbnail pictures on left-hand side of web page
 
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You can also scribe a mark on the tool rest for the center point and a scribe mark for the diameter of the tenon size you want, align the center mark to the wood blank and use the other scribed mark to align your pencil to mark the tenon. A sharpie mark will last a long time if you don't want to put a scribed mark on the tool rest.
 
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That looks like an excellent gauge but I would like to suggest that you plane the gauge down to about 3/8th" to also gauge the length of the tenon.
Would be probably a good thing to do, but Im too lazy to bother with that.. length of tenon is easy to eyeball, it doesn't need precision there - 'bout a quarter inch or a little over is good enough for most of my work, I may go a bit longer for bigger pieces... just finished roughing out 18 bowls over the last day and a half, can almost hit my tenon dead on without even using the gage now, just by eyeballing it.. but I always like to check just to be sure...
 
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