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Re: [ATM] Bevelling
I've seen something like that when I was having a bathroom mirror cut down at a local glass shop. I didn't see any flying glass dust then; the belt, IIRC, was huge, maybe 12 feet long altogether? I don't know where the dust or mud went.
Last night I used a diamond-impregnated bit to trepan a test piece of glass that was maybe 3/8 inch thick - first time for any of us. The hole was 125 mm in diameter. We just used water to keep the dust down. It cut through the glass in about 5 minutes in a drill press. Very little mess. A few chips on the back side where the drill came through. If I had made a jig so that we were cutting from both sides, there would not have been chips, but this was just a test.
Will have to do much the same thing when we core the lurie-houghton lenses.
Guy
Kevin MIchael Zabbo <chaosopher23@yahoo.com> wrote: I broke the rules with my 13.25" blank, which needed a
serious amount of bevel: .25". I took it to a
glassworker and saw the operation. It was a
water-cooled belt sander that moved a bit fast for my
tastes, but it did the best job I have ever seen on a
bevel. It took all of a minute and a half, and no
glass dust flew anywhere. It all came out as mud.
If the rules aren't as ye likes 'em, ye rewrites 'em.
Kevin of Eastern Iowa
Seeker of the Darkness
--- Michael Lindner wrote:
> On Sat May 20 2006 1:57 pm, Richard wrote:
> > JB> try 1500 to 2000 rpm for starters
> >
> > Wow, OK Jan, I'll try it.
>
> Generally, beveling strokes should be tangential to
> avoid pulling off chips.
>
> That said, you may want to reconsider. At 2000 RPM,
> glass dust is going to be
> flying everywhere, and it is highly toxic
> (http://www.newportglass.com/amspyrx.htm) - you do
> not want to breathe it in!
>
> Also, I would estimate that with a handheld diamond
> file it would take no more
> than 10-20 minutes to put abevel on a 20" blank -
> less time than it would
> take to set up your mill (and clean it afterward!),
> and safer.
>
> Clear skies.
> --
Guy Brandenburg
Washington, DC
My home page:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
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