i need to make four similar discs, the problem is that with a chuck and
screw i cant think of a way to measure depths. i measured and marked
the different radii but they dont really come out similar with only the
length marks in common. if any one could help- its pretty urgent the
project is due on fri.
thanks
~B
heres pics of what i need to copy.
http://hs.facebook.com/photo.php?pid...480002&l=589db
http://hs.facebook.com/photo.php?pid...480002&l=589db

Most copied turnings that are not for instruments, need not be _precise,
just visually _similar. I may have misunderstood your problem as this
work doesn't seem to require precision, just your usual careful turning
and checkng with double ended or thickness calipers or even bent coat
hanger wire. If not, could you measure the depth of the concentric coves
with a depth gage from a straight edge laid across the diameter or
measure overall and subtract the chuck's depth?


Turn to Safety, Arch
Fortiter



http://community.webtv.net/almcc/MacsMusings

it has to be pretty exact cuz the pieces will be very close together
and differences very noticeable. what are those jigs called with pins
to help u measure the shape and curvature of ogees, etc? anyone one
have an idea how to make them using pins?
thanx
~B

bizHB wrote:

it has to be pretty exact cuz the pieces will be very close together
and differences very noticeable. what are those jigs called with pins
to help u measure the shape and curvature of ogees, etc? anyone one
have an idea how to make them using pins?
thanx
~B


They're called a "contour gauge" or "wire gauge". For an example see:

http://www.acehardware.com/sm-genera...i-1292852.html

--
Jack Novak
Buffalo, NY - USA

(Remove -SPAM- to send email)

Sorry bizHB, I understand now. You want precise shape as well as depth.
There is a thread in the archives about using contour gages. IIRC, Leo
L. discussed profiling with pins vs fingers. I think the Lee Valley
catalog shows most of the marking and measuring tools woodturners use.


Turn to Safety, Arch
Fortiter



http://community.webtv.net/almcc/MacsMusings

B is this what you're after ???

http://www.leevalley.com/wood/page.a...936,42958&ap=1

Have fun and take care
Leo Van Der Loo

"Leo Lichtman" wrote: (clip)This could be done fairly easily using a
technique shown on Kevin Neeley's website. (clip)
^^^^^^^^^^^^^^^^^
He spells his name Kevin Neelley, and he is at www.turnedwood.com Click on
SEGMENTED TURNINGS and then on LASER WALL THICKNESS GAUGE.

That's pretty well how the RAF Dam Busters blew the German Dams during
WW2. A light at each end of the air(o)plane was shone down onto the
surface of the water. When they formed a figure 8, the altitude was
right. There isn't anything new!
Reg. Sherwin.