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Re: SRSG disk material (cutting circles)



Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

I am a big fan of rigging up a jig with a bandsaw, a saber saw or rotozip or
router or ??? to cut circles in sheet material.

And, for a RSG, you could probably just mark and drill your center hole,
hook up your mandrel or whatever you're going to hold it with (3/8" bolt and
nut?).  Then, spin it in the bearings or motor by hand with a scribe held on
something attached the base and mark the circle.  That way you get a GOOD
mark that is truly concentric to your shaft.  You then demount it (keeping
the mandrel in, so you don't lose the "center") and roughly cut with any
convenient saw.  Finally, go to it with a coarse rasp or grinding wheel.

When you get it approximately round, you can spin it with the motor and just
hold the tool on an improvised tool post.

The idea here is to avoid having to repeatedly find the true center by
fixing the shaft once, and then using it forever as the reference.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, January 14, 2001 1:18 PM
Subject: Re: SRSG disk material


> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<Parpp807-at-aol-dot-com>
>
> In a message dated 1/14/01 1:44:36 PM Central Standard Time,
tesla-at-pupman-dot-com
> writes:
>
> << an adjustable circle-cutter (be careful with this
>  thing!!!)  >>
>
> AKA  FLY CUTTER. Yes, do be very careful. Don't try to hold onto whatever
you
> are cutting.
> Clamping the work to a smooth and level surface will save much pain and
even
> blood.
> Also, remember to change the position of the cutter so the bevel is on the
> outside.
> You want the disc, not the hole. I have used the fly cutter many times on
> many different
> materials. Is is a very dangerous tool.
>
> Happy day,
> Ralph Zekelman
>
>
>
>