A much more elegant solution than mine if you're turning out a lot of them.
Glad to be of help.

Cheers,

Frank


"Larry Levinson" wrote in message
...
Frank, I did essentially what you suggested, though with a few
differences. I took my ``jig'' and added a runner to the bottom and a
stop to the end. (I actually want the center hole to go through so
using the 1/4" bolt and drilling out the hole is a benefit, not a
drawback.) To cut the circle, I put the blank -- 4" good guess -- on
the jig, slide the jig and blank onto the table and into the blade,
and when it hits the stop at the end of the jig, start turning around
the pivot ... thanks for the help.








"Frank McVey" wrote:

Hi Larry,

For circles this small, simply cut a piece of ply/mdf - around 3/8 - 1/2"
thick the same size as your BS table. Start the saw and push the ply/mdf
through the saw until it completely covers the saw table, forming in
effect
a false table top. Switch the saw off.

Depending on the size of your table top, you can either clamp it in place
or, if the clamps will get in the way, slip some double-sided tape
between
the false and real table-tops to hold them in place. Make sure the table
is
dust- and oil/wax-free, or it won't stick.

Taking the normal infeed position as being 6 o'clock, pencil a line from
the
cutting edge of the blade out to 3 o'clock on the false table, so you
should
have a line extending from the edge of the blade and at right angles to
it.

Measure along this line - in your case - 1 1/2" mark the spot and tap in
a
small round nail, (16g or so, it's not crucial) until it contacts the
real
table. Snip it off about 1/8" above the table, using a pair of
sidecutters
or pliers, leaving a sharp point. If the point isn't sharp enough, you
can
dress it with a small file or oilstone until it is. This, of course,
will
be your pivot.

Feed the blank - probably about 4" square in your case - into the saw,
taking about 1/4" from the LHS with the majority of the blank standing
out
to the right of the blade. Obviously, it won't lie flat on the table
because the pivot point is sticking up, but that doesn't matter, it'll
ride
over it. Once you have fed it through sufficiently far for the centre of
the blank to lie roughly above the pivot pin, give the blank a thump
right
in the centre with your fist or a hammer to seat it firmly on the pin.
Continue to feed the blank, pushing gently on the LH corner nearest you
and
you will find that it will start to rotate on the pin, giving you a
perfect
circle.

Quick and dirty - yes. But it gives great results without the need to
drill
the blank and it only leaves a small pinprick in the finished circle.
It's
very quick to do - you can turn out several circles per minute, and best
of
all, it's absolutely free. And that's important to a Scotsman!

HTH - let us know how you get on.

Cheers,

Frank


"Larry Levinson" wrote in message
...
I know there has to be a simple answer:

I made a small circle-cutting jig from some MDO and a 1/4" bolt, with
the bolt 1.5" from the edge of the jig. I want to end up with 3"
circles. The problem is that if I make a blank big enough for a 3"
circle, I can't fit it between the pivot bolt and the blade, and if I
make the blank much smaller, I end up with large flat spots on the
circle. What am I doing wrong?

Thanks in advance.


If I had a really good sig file statement, this is where it would be.


Larry Levinson
Talking up to the vocal ...
LLevinson*Bloomberg.net
(remove the star etc ....)