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How to smooth a rough glass edges into a sparkling smooth surface. Sam Nickaby 07-18-2006
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Posted by Moonraker on July 19, 2006, 3:50 pm

> Excuse this newbie for poking her nose in (a pokey nose?), but after
reading
> this posting for a time, I was wondering if what you really want isn't
> acrylic? First, it is about half the weight of glass, which I suspect
would
> be a consideration for a performer. Secondly, it would make the safety
> issue a lesser issue. And third, I understand that it is frequently used
in
> magic props in place of glass, making the one you saw in Japan possibly
> acrylic. Oh, yeah..fourthly (?) it is used in aquariums
alot...specifically
> because it can be made colorless (as opposed to thicker POG which tends to
> appear greenish) and the seams can be made to appear "invisible", both
> through polishing and chemically. Hey, it looks like glass 'cuz it's
magic!
>
> Just a thought.
>
Very interesting...and the edge of the plastic can be "flame polished".



Posted by Sam Nickaby on July 19, 2006, 6:50 pm

> > Excuse this newbie for poking her nose in (a pokey nose?), but after
> > reading this posting for a time, I was wondering if what you really want
isn't
> > acrylic? First, it is about half the weight of glass, which I suspect would
> > be a consideration for a performer. Secondly, it would make the safety
> > issue a lesser issue. And third, I understand that it is frequently used in
> > magic props in place of glass, making the one you saw in Japan possibly
> > acrylic. Oh, yeah..fourthly (?) it is used in aquariums alot...specifically
> > because it can be made colorless (as opposed to thicker POG which tends to
> > appear greenish) and the seams can be made to appear "invisible", both
> > through polishing and chemically. Hey, it looks like glass 'cuz it's magic!
> > Just a thought.
>
> Very interesting...and the edge of the plastic can be "flame polished".

Sound like a good idea but I have a few questions...

Any scratches or finger prints can foul the trick. Can that be practically
removed easily?

Will it work with the drop of liquid/oil/glue with the same index of refraction
as the glass?

Should I use Cerium Oxide for polishing acrylic?

When tapping the acrylic with a silver ring, will it sound like glass?

Thanks







Posted by Moonraker on July 19, 2006, 7:29 pm

>
> > > Excuse this newbie for poking her nose in (a pokey nose?), but after
> > > reading this posting for a time, I was wondering if what you really
want isn't
> > > acrylic? First, it is about half the weight of glass, which I suspect
would
> > > be a consideration for a performer. Secondly, it would make the
safety
> > > issue a lesser issue. And third, I understand that it is frequently
used in
> > > magic props in place of glass, making the one you saw in Japan
possibly
> > > acrylic. Oh, yeah..fourthly (?) it is used in aquariums
alot...specifically
> > > because it can be made colorless (as opposed to thicker POG which
tends to
> > > appear greenish) and the seams can be made to appear "invisible", both
> > > through polishing and chemically. Hey, it looks like glass 'cuz it's
magic!
> > > Just a thought.
> >
> > Very interesting...and the edge of the plastic can be "flame polished".
>
> Sound like a good idea but I have a few questions...
>
> Any scratches or finger prints can foul the trick. Can that be practically
removed easily?
>
> Will it work with the drop of liquid/oil/glue with the same index of
refraction as the glass?
>
> Should I use Cerium Oxide for polishing acrylic?
>
> When tapping the acrylic with a silver ring, will it sound like glass?
>
> Thanks
>
Plastic will scratch.

Dunno about the oil for the refraction.

No. don't try cerium on plastic. Plastic edges are flame polished.

It won't sound like glass....

I repeat....go to a commercial glass shop and have them make this. You
might have them make some polished chamfer edge bevels and "flip" one so
the two chamfers were the mating faces? Might be less apt to chip and have
sharp edges. Blood is a dead giveaway that you were tricking somebody....





Posted by Bob May on July 19, 2006, 8:11 pm
Glass can be had in waterwhite if needed but I'd rather use the plain green
glass for this trick as it will tend to hinder the viewing of the oil on the
glass surface as the viewer would tend to understand green glass a lot
better and when the edge disappears due to the oil, he'll be more believing
of the trick.
A flame polished edge of an acrylic sheet won't be flat enough to do the
oiling trick on the edges either so you need to polish them with the
abrasive techniques and make sure that the edge is good and square - you
will still have the location of the edge marked with a V if you don't get
that edge square.

--
Why do penguins walk so far to get to their nesting grounds?



Posted by mike1942f on July 23, 2006, 1:20 am
Just to clarify "flame polished" on acrylic was a metafor, meaning
the edge on acrylic that looks like flame polished on glass. Since
acrylic goes limp at about 225F and chars at about 450F (like paper),
unless someone has slid something by me, it can't be flame polished.
It is normally polished with buffing wheels a lot like glass but a lot
faster.
The image of the project had gone away by the time I saw it, but my
light weight experience growing up with magic effects and illusions
suggests this is being made a lot harder than it should be.
Unless the glass is pretty much held in place, the oil is not going
to work as it will get all over everything. And is pretty much not
needed, I suspect. If nothing else, you need to go to one of the
places that cuts and grinds and polishes glass for table tops and
handle some of their samples of edge finishing and see how closely they
fit together.

Bob May wrote:
> Glass can be had in waterwhite if needed but I'd rather use the plain green
> glass for this trick as it will tend to hinder the viewing of the oil on the
> glass surface as the viewer would tend to understand green glass a lot
> better and when the edge disappears due to the oil, he'll be more believing
> of the trick.
> A flame polished edge of an acrylic sheet won't be flat enough to do the
> oiling trick on the edges either so you need to polish them with the
> abrasive techniques and make sure that the edge is good and square - you
> will still have the location of the edge marked with a V if you don't get
> that edge square.
>
> --
> Why do penguins walk so far to get to their nesting grounds?


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