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I have a problem getting a thin disk (1/4") setup in a 3-jaw chuck so
that it doesn't wobble. If one side is finished, I can use an
indicator but this is very tedious. An even bigger problem occurs
when I want to finish the second side parallel to the first. Can
anyone give a beginner some help or point me in the right direction?

Thanks, Clay

ccarlile1 <ccarlile1@...> wrote:
I have a problem getting a thin disk (1/4") setup in a 3-jaw chuck so
that it doesn't wobble. If one side is finished, I can use an
indicator but this is very tedious. An even bigger problem occurs
when I want to finish the second side parallel to the first. Can
anyone give a beginner some help or point me in the right direction?

Thanks, Clay

Make a spider of the right thickness and use it as a backplate. Or make some soft jaws and use bored to the correct step for your part. Good luck





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Charlie
cwalklin1@...

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Clay, I have used matched tool bits as shims under the jaws as shims to
space the workpiece up parallel to the back side to make a cut. After
clamping the disc firmly just slip the spacers out and take light cuts!

Bill in Boulder "Engineering as an Art Form!"

A piece of packing long enough to let the work protrude from the
jaws, bearing against the chuck face. Things like faced off tubing
scraps or hardwood work for lengthwise alignment, depending on
diameter. A set of adjustable parallels is quick for set-up, but not
as solid a grip as a hardwood spacer (the parallel is removed before
turning; the wood stays in place.)

Roy

--- In 7x12minilathe@..., "ccarlile1" <ccarlile1@y...>
wrote:

I have a problem getting a thin disk (1/4") setup in a 3-jaw chuck

so

that it doesn't wobble. If one side is finished, I can use an
indicator but this is very tedious. An even bigger problem occurs
when I want to finish the second side parallel to the first. Can
anyone give a beginner some help or point me in the right direction?

Thanks, Clay

--- In 7x12minilathe@..., "ccarlile1" <ccarlile1@y...>
wrote:

I have a problem getting a thin disk (1/4") setup in a 3-jaw chuck

If the disk has any holes in it, you can use them to mount it to a
faceplate. If there is one central hole (like a washer), you can use
a drawbar (long bolt) to hold it to the spindle nose - use some paper
(typing or similar) to increase friction between the work and the
spindle nose.

If you must use the 3-jaw, use parallels between the workpiece and
the front of the chuck. You may need to add shims if the front of
the chuck is not true. Be certain to remove the parallels before you
apply power to the lathe - they WILL come flying out if they possibly
can.

If the answers you have so far don't seem to solve to problem, ask
again with a little more detail about the workpiece.

RA

Thanks to all for the many suggestions.
Clay

--- In 7x12minilathe@..., "Richard Albers"
<rralbers@j...> wrote:

--- In 7x12minilathe@..., "ccarlile1" <ccarlile1@y...>
wrote:

I have a problem getting a thin disk (1/4") setup in a 3-jaw

chuck

If the disk has any holes in it, you can use them to mount it to a
faceplate. If there is one central hole (like a washer), you can

use

a drawbar (long bolt) to hold it to the spindle nose - use some

paper

(typing or similar) to increase friction between the work and the
spindle nose.

If you must use the 3-jaw, use parallels between the workpiece and
the front of the chuck. You may need to add shims if the front of
the chuck is not true. Be certain to remove the parallels before

you

apply power to the lathe - they WILL come flying out if they

possibly

can.

If the answers you have so far don't seem to solve to problem, ask
again with a little more detail about the workpiece.

RA

Clay,

Here's a late reply, but may be useful.

See message 10157 in yahoo group "9x20lathe" on a way to make a disk,
fully finished on all sides/edges. If you're not a member, email me
and I can send it.

Craig


--- In 7x12minilathe@..., "ccarlile1" <ccarlile1@y...>
wrote:

I have a problem getting a thin disk (1/4") setup in a 3-jaw chuck

so

that it doesn't wobble. If one side is finished, I can use an
indicator but this is very tedious. An even bigger problem occurs
when I want to finish the second side parallel to the first. Can
anyone give a beginner some help or point me in the right direction?

Thanks, Clay