On Sat, 6 Aug 2005 20:55:48 -0700, "william_b_noble" wrote:

if I had to guess, barry, the grain is running perpendicular to the ways
rather than parallel to it - mahogony is not strong in cross grain shear -
just don't be so agressive in hollowing - if the grain were running parallel
to the ways, 2" would have been plenty strong.

just my 2 cents

bill N (been there, done that, sadly, more than once)

thanks, Bill.. that's exactly what I was trying to say in the prior post, but
the words weren't forming... I need more coffee!




"Barry N. Turner" wrote in message
. ..
I went to the shop to turn a bowl. I had a dry 10" X 10" X 4" Honduras
Mahogany blank that I bought some time ago. I turned the outside shape
with
a 4" foot and a 2" tenon. I power sanded the exterior and reversed the
bowl
to hollow it. After hollowing, I intended to reverse the bowl again and
turn away the tenon, leaving a simple 4" concave foot.

I trued the rim and started to establish the wall thickness, using my new
Crown PM bowl gouge. All was going well. The bowl was hollowed about
halfway down when I got a king-sized catch and ripped the bowl from the
chuck, leaving the 3/8" X 2" tenon behind in the jaws.

The bowl is intact, except for a deep gouge in the rim, which can be
turned
away. I salvaged the tenon from the chuck jaws and carefully glued it
back
to the bottom of the bowl using medium-viscosity CA glue. I'm going to
leave it clamped overnight and try again.

Considering the ease with which I was able to rip the tenon from the bowl
made me wonder, is a 2" tenon adequate for turning a 10" diameter bowl? I
suspect that it may be on the small side. Thoughts?






mac

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