Re: Spindle turning help needed


"Darrell Feltmate" <darrellfeltmate@xxxxxxxxxxx> wrote in message news:_m5Xi.2719$h57.847@xxxxxxxxxxx
George
When you cut the tenon for the chuck make sure of two things:
1. the tenon should NOT bottom out on the chuck. In other words it needs to be long enough for the jaws to catch and short enough not to bottom out on the chuck face.
2. the shoulder must be square. The real strength of the hold comes not from the grip on the tenon so much as the flat of the shoulder against the jaws of the chuck.

You can undercut the shoulder a bit to protect yourself against the worse circumstance, which is out of square the other way. It'll get you 90 % of what you'd get from perfect.

Third possibility available if you have dovetailed jaws. Use the wedging action of the dovetail to help you keep the face of the jaws tight up against the shoulder. You already know that you want to make the tenon of a diameter which allows the most metal to be in contact with wood, rather than just those teeth, right?

As far as hollowing along the grain, you might consider a common cheat and bore a big hole to a bit less than the finished depth of the goblet. Allows you to work your way against the side grain. Open the area toward the rim and take successively deeper cuts bottom up and inside out. Fingernail ground gouge or full point are the ones I find best.

Pointy. http://i35.photobucket.com/albums/d160/GoodOnesGone/a63b77ab.jpg

Tale in the shavings. http://i35.photobucket.com/albums/d160/GoodOnesGone/5fa71f2e.jpg They're feathered on the side where the gouge exits the wood - toward the bottom - and square where it enters. That's where the taper grind helps. More support than a simple fingernail.

.

Relevant Pages

  • Re: Did I buy the wrong chuck?
    ... should the length of the tenon favor bottoming out the end of the tenon in ... or should the turned object bottom out on the top of the jaws? ... It's wider than the bottom of the tenon, so possesses greater leverage, too. ... Doesn't take much tenon depth to hold a piece snug to the nose of the jaws, especially if you're using a dovetail, where snugging the chuck wedges the wood down and toward the nose. ...
    (rec.crafts.woodturning)
  • Re: Did I buy the wrong chuck?
    ... Lynn your blank should bottom out on top of your jaws, ... make a small goblet or would I have this problem no matter which chuck I ... tenon was the best way to grip the wood. ... or should the turned object bottom out on the top of the jaws? ...
    (rec.crafts.woodturning)
  • Re: Spindle turning help needed
    ... When you cut the tenon for the chuck make sure of two things: ... the tenon should NOT bottom out on the chuck. ... I thought that the steady rest would support it and help hold ...
    (rec.crafts.woodturning)
  • Re: Turning a bunch of small boxes. One quick and dirty method.
    ... Turn between centres turning a tenon on both ends to fit chuck. ... Remove 4 point driver from chuck, and insert tenon, placing revolving ... put aside and mount the lid on the previously cut ...
    (rec.crafts.woodturning)
  • Re: Spindle turning help needed
    ... in the chuck and to be sure that the chuck was gripping squarely against the ... One has a tenon that is not ... quite square and is bottoming out at one spot. ... gripping the wood AND the jaw faces are butting up against the ...
    (rec.crafts.woodturning)
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