Date: Tue, 11 Jul 2000 11:43:51 -0700

Author: Jim Krider

Subject: RE: Plexiglas

Post:

Plexiglas is soft compared to glass. I use a cerium oxide paste and rub the
edges in the paste on a flat glass surface. The Plexiglas eventually will
take the shape of the glass. This is the same technique used by amateurs to
grind telescope lenses. Jeweler's rouge (ferric oxide) could also be used.
Both are used as optical polishes and you can't get a shinier finish than an
optically smooth finish.

Jim
******************************************
Jim Krider James.Krider@asu.edu
Physics and Astronomy Instructional Resource Team
Arizona State University Department of Physics and Astronomy
PO Box 871504, Bldg. PS Rm. F470,Tempe, Arizona 85287-1504
Phone: 480-965-8086 FAX: 480-965-7954 Web:
http://www.public.asu.edu/~jkrider/


-----Original Message-----
From: Bernard G. Cleyet & Nancy Ann Seese
[mailto:georgeann@redshift.com]
Sent: Tuesday, July 11, 2000 11:13 AM
To: tap-l@listproc.appstate.edu
Subject: Re: plexiglas


I suspect using a metalographic wheel (used to prepare samples for etching
and microscopic examination) would polish w/o rounding the edges

bc


Charles Sowers wrote:

> We use hydrogen/oxygen torch to flame polish. We also scrape plexi to get
> nice surface for gluing. Scrapers can be purchased at plastics shop or you
> can use a piece of 3/16 thick tool steel or just about anything you want.
> We also use tripoli and rouge on cotton buffing wheels (don't use these
> wheels for polishing metal, keep a clean set just for plex). Both forms of
> polishing rounds over the corners a bit.At 09:21 PM 7/6/00 -0400, you
wrote:
> >
> >Speaking of which, how do you get that nice smooth cut edge. I tried
> >"flaming" it with a blow torch and got a black messy edge. The plexi
pros
> >get those ultra smooth edges before they "glue". Anyone know the secret?
> >
> >Brian Holton
> >
> >>
> >>
> >> With the cutting edge kept cool, it doesn't have to crack when
> >> sawn, and the cut edge can be flame-smoothed to glass clear, I hear...
> >>
> >> Brian
> >>
> >> brian whatcott
> >> Altus OK
> >
> >
> >
> Charles "Chabo" Sowers
> Exploratorium
> 3601 Lyon St,
> San Francisco, CA 94123
> 415-674-2814

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