Re: [TCML] Cutting Garolite disk

[G Hunter <dogbrain_39560@xxxxxxxxx>]

Draw a circle on the phenolic using a compass.  Use a jigsaw with a fine-toothed scrolling blade to cut out the circle.  Mark the center of the disk with a sharp punch--the stylus of the compass should've left a mark.  Drill a hole in the center.  A new, sharp, pilot-point drill bit is best for this task. Insert a close-fitting bolt in the hole and clamp it tightly using washers & nuts.  Chuck the assembly into a drill and spin the disk against a file or a sanding block to achieve perfect roundness.  

This is not as easy as it sounds.  Best to budget a couple of hours for it.

I've made two, high speed ARSG disks using this technique.  They required no additional balancing, as vibration was negligible.

Greg

--- On Mon, 6/21/10, Joe Mastroianni <joe@xxxxxxxxxxxxxx> wrote:

> From: Joe Mastroianni <joe@xxxxxxxxxxxxxx>
> Subject: [TCML] Cutting Garolite disk
> To: "tesla@xxxxxxxxxx" <tesla@xxxxxxxxxx>
> Date: Monday, June 21, 2010, 1:06 PM
> 
> Ok,
> So I'm making a srsg and I am convinced of the primacy of
> garolite as the material to use for the disk holding the
> spinning electrodes. But as far as I can tell my sources of
> garolite will all provide square or rectangular chunks (eg -
> mcmaster-carr)
> 
> What's the best technique to cut a precise circle out of
> these square pieces?
> 
> I don't have a band saw...
> 
> Thanks in advance
> Joe
> 
> Sent from Joe's mobile phone.
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