I was at Darrell Feltmate's site ( http://aroundthewoods.com ) the
other day (followed a thread from this group) He has a page that
describes making cole jaws from plywood for a oneway chuck. I tried it
(first try) & the jaws were way off. I imagine that I drilled the
holes wrong. It was my strategy to drill holes while the circle was
whole & make sure they fit the base jaws & then round the disc and
bandsaw from there. When the holes in the ply didn't line up, I
bandsawed anyway & met disaster-- anyway
Question:
Could I turn a disc and turn a recess to match the bump out on the back
of the outer jaws & actually use the jaws as a drill guide? They ARE
case hardened-- I don't imagine that a hss drill would round out the
holes. Thought I'd pass this on to the group before maybe voiding my
warranty with Oneway.
PH---

On 10 Jul 2005 16:09:26 -0700, wrote:

I was at Darrell Feltmate's site ( http://aroundthewoods.com ) the
other day (followed a thread from this group) He has a page that
describes making cole jaws from plywood for a oneway chuck. I tried it
(first try) & the jaws were way off. I imagine that I drilled the
holes wrong. It was my strategy to drill holes while the circle was
whole & make sure they fit the base jaws & then round the disc and
bandsaw from there. When the holes in the ply didn't line up, I
bandsawed anyway & met disaster-- anyway
Question:
Could I turn a disc and turn a recess to match the bump out on the back
of the outer jaws & actually use the jaws as a drill guide? They ARE
case hardened-- I don't imagine that a hss drill would round out the
holes. Thought I'd pass this on to the group before maybe voiding my
warranty with Oneway.
PH---

Start with the "flat jaws" from Oneway...
They're inexpensive (for Oneway *g* ) jaws that are designed to add your own
clamping or holding system to..

After using ring clamps, a sock on the face plate or chuck, tuner's tape on a
face plate of wood blank, and everything short of Voo Doo, I broke down this
weekend and ordered a set of Jumbo jaws.. I'm tired of mickey mousing bowls just
to save $80.. YMMV


mac

Please remove splinters before emailing

Question:
Could I turn a disc and turn a recess to match the bump out on the back
of the outer jaws & actually use the jaws as a drill guide? They ARE
case hardened-- I don't imagine that a hss drill would round out the
holes. Thought I'd pass this on to the group before maybe voiding my
warranty with Oneway.

Don't use 'em as drill guides but *do* use 'em as guides: find some nails
or centre-point drill bits that snugly fit into the jaw holes and use them
punches. If you put one in each hole of a jaw (and they fit properly) then
you can use your free hand to hold the jaw level & in position while you
give each nail a quick tap. This saves you from accidentally moving the jaw
when using only one punch and moving it from one hole to the other. ;]

Personally I position all 4 jaws on the blank, keeping the same 1,2,3,4
order that they go on the lathe and tape around the outside to keep 'em
snugged together. I also like to add some spacers (the same size as the
kerf on the saw I'll use to divide the blank) between the jaws to allow a
more accurate finish, but that's just me. [shrug]
Doing it this way it's easier to use *3* nails... line up the jaws with the
pencil marks on the blank and put nails in two opposing holes. eg. The
outer holes of jaws 1 & 3. Tap 'em in enough that they'll hold the jaws in
position. Use the 3rd to centre-punch the rest. Easy.

Don't drill the holes for the hold-downs until /after/ the blank's cut up
and test-mounted on the jaws. Once 'tis mounted, assuming it fits G,
close the jaws as far as they'll go, spin 'em up and use a pencil to mark a
circle for the diameter wanted. You can always add others later for the
sizes you need as you need 'em. Shut 'er down, remove the blanks from the
jaws and subdivide each quadrant @ about 20 to 24deg from the edges.
Whatever angle you use, make sure all are the same! Then centre-punch &
drill the hold-down holes at the intersections of the angled lines & circle.

Pre-measuring & drilling in advance is all very nice if you /know/ nothing
will go wrong, but in my case...

--
- Andy
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