This begs the use of a faceplate held on with six or eight substantial
screws (min #10x1", better #12x1 1/2" if you have the wood to spare on
the base).

The problem is not so much the holding power of the check but the
integrity of the wood. You are engaging maybe 1/32" of wood across two
inches to hold against leverage that is maybe 8 or 10 inches away
(consider the engagement on only one side of the jaws, the other side is
the pivot point). The wood is probable giving away or compressing and
sliding through. It is true that larger jaws will improve your odds but
faceplates are cheaper and quite handy to have around.

Also recognize that the leverage you are exerting on the chuck's hold is
not so much based on the diameter, but moreso the distance you are from
the chuck.

(this may or may not translate for you)

This length----------
_____________________
| |
spindle | |
|_____________________|

versus ^
|
this jaw diameter is the lever factor to consider.

Your scraper may easily have a 5:1 advantage over the chuck. How thin of
a slice must you take not to overpower that 1/32" engagement? Sure, you
have more wood engaged in the chuck than with the scraper, but the chuck
must win the contest 100.0% of the time. Any single instant where the
scraper wins and you are chasing lumber around the shop.

Good luck, and try a face plate,
David
--
http://www.wademade.net


Wood Turn It Dont Burn It wrote:

I am in the process of turning a, I think It's red cedar, vase and
would appreciate recomendations on how to hollow it. It is hour glass
shaped, 4in on top, 2 in at center and 3 1/2 at the base and is 10in
long. I have turned a spigot at the base and it's being held by a
OneWay Talon chuck. I have a 5/8 in hole drilled through the top center
to the base. I have tried using all of my tools I use for bowl work
(small scrapers, small gouges, parting tool) but I can only take micro
cuts without risking launching the vase. At that rate of removal, it
would take forever to complete. What can I use on this end grain to
hollow this sucker out. Your help is appreciated.


STEMO