Three keys to make a good tenon for holding bowls and vessels in the chuck while woodturning.
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- เผยแพร่เมื่อ 10 ก.ค. 2021
- In this video, I will go over the three keys for creating a well-formed tenon that will hold your bowl, vessel, or other woodturning project firmly in the chuck while you are hollowing.
The three keys are (in order of importance):
1. The top of the jaws must have a nice flat bearing surface (shoulder) to ride against. The majority of your holding power comes from paying attention to this detail.
2. The diameter of the tenon must match the chuck jaws, do not try to get away with just having one set of jaws and putting in a tenon that is way too big for the jaws (Or using a tenon that is the correct size for the jaws but way too small relative to the workpiece). Long story short, you will eventually need multiple sets of jaws. The jaws are a true circle when they are just slightly open (a 1/16" - 3/32" gap between jaws) and this is the diameter at which they will have the greatest holding power because the entire surface of the jaws will be making contact.
3. Matching the dovetail (or other) shape of the jaws.
Pay attention to these concepts and take the time to make your tenons correctly and bowls that fly out of the chuck will be a thing of the past for you! - แนวปฏิบัติและการใช้ชีวิต
First time I've heard about the jaw size issue. Might explain why I've had so many things flying around the shop lately.
I’m a total newbie. Very helpful video. Thanks.
Good video, thanks. I note that Crown Tools, in advertising their dovetail scraper, states that "Tests have shown that as much as 50% of a collet chuck's gripping power is lost if the dovetail angle is out by as little as 5°." This might just be an effort to sell their scraper, but even if the point is true, I think that it is not difficult to eyeball the angle within 5º, so it is likely to be accurate enough to do it without any special tools or measurements.
Well I thought there was some best practice in doing this but was always secret squirrel stuff
I use One Way chucks and whatever diameter I have for the tenon works fine, I make it my way and it works fine. You and all the others that waste their time trying to figure out the correct diameter, buy a good set of jaws and you won't have to worry about this minor thing.