Advice on adhesive

Hello again all,

Does anyone out there have some experience
with an adhesive suitable for supporting
the weight of a full-thickness (2.1")
12.5" diameter mirror? I need to do this
with only three 1.25" diameter support points
on an aluminum disc which supports the mirror
cell (no room to maneuver in the bucket holding
the mirror, so there are few if any other design
options possible).

So, this would be a metal-to-metal bond that
could ideally be cut away in the future for
maintenance or cell restructuring.

Any advice appreciated,

gregory



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Here you go.
GE Silicone II 100% Silicone Sealent Clear
Place your aluminum disk on a level surface. Stack 5 pennies in three piles
in a triangle. Put three glops of sealent next to the pile (50 cent piece
size), making sure they are higher than the stacked pennies. Place mirror
shiny side up and centered on the aluminum disk. Wait 24 hours for the
sealent to cure. Run a layer of duct tape around the mirror edge and onto
the aluminum disk for safety sake. And that is it. Mine has been holding
in all sorts of temperatures and vibration conditions.
Matt Mills

"gregory" wrote in message
...
Hello again all,

Does anyone out there have some experience
with an adhesive suitable for supporting
the weight of a full-thickness (2.1")
12.5" diameter mirror? I need to do this
with only three 1.25" diameter support points
on an aluminum disc which supports the mirror
cell (no room to maneuver in the bucket holding
the mirror, so there are few if any other design
options possible).

So, this would be a metal-to-metal bond that
could ideally be cut away in the future for
maintenance or cell restructuring.

Any advice appreciated,

gregory



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Hello again all,

I can see by Matt Mills's excellent response that
I was not clear enough (despite trying!) in my
original post. The mirror already rests in a
cell that in turn rests on an aluminum disc.
The mirror does not need to be glued to the
disc, rather, the disc needs to be glued to
three (steel) support points on an underlying
bucket. So, it is a metal-to-metal bond that is
needed, and preferably, one that can be cut
apart if necessary (so, J.B.Weld or some such
permanent bond is less desirable, but OK if
that's all that will work).


------------------
| mirror (1) |
------------------
al. disc -- --------------
* * *
support posts | | |
bucket ---------------

Bond needed between support posts and aluminum disc
(where asterisks are).

Thanks again,

gregory



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How do you get the pennies out?? ;-)

-Florian


You don't. The brass in the pennies keeps the mirror from getting arthritis.
:-)


Richard Navarrete

Astrophotography Web Page - http://members.aol.com/richardn22

I would use the same adhesive I use in mirror flexing, i.e. 3M Scotchweld
3459. It is a 2-part polyurethane glue, giving a very strong bond while
retaining some flexibility. However, it is pretty hard to come by, and if I
didn't have access to it I think I would try Gorilla Glue, which is a 1-part
polyurethane. When dry it too retains some flexibility, and it feels a lot
like the 3459. Gorilla Glue is readily available in hardware and home
improvement stores.

Dennis

"gregory" wrote in message
...
Hello again all,

Does anyone out there have some experience
with an adhesive suitable for supporting
the weight of a full-thickness (2.1")
12.5" diameter mirror? I need to do this
with only three 1.25" diameter support points
on an aluminum disc which supports the mirror
cell (no room to maneuver in the bucket holding
the mirror, so there are few if any other design
options possible).

So, this would be a metal-to-metal bond that
could ideally be cut away in the future for
maintenance or cell restructuring.

Any advice appreciated,

gregory



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Make that 3M Scotchweld 3549.

Dennis

"Dennis Woos" wrote in message
...
I would use the same adhesive I use in mirror flexing, i.e. 3M Scotchweld
3459. It is a 2-part polyurethane glue, giving a very strong bond while
retaining some flexibility. However, it is pretty hard to come by, and if
I
didn't have access to it I think I would try Gorilla Glue, which is a
1-part
polyurethane. When dry it too retains some flexibility, and it feels a
lot
like the 3459. Gorilla Glue is readily available in hardware and home
improvement stores.

Dennis

"gregory" wrote in message
...
Hello again all,

Does anyone out there have some experience
with an adhesive suitable for supporting
the weight of a full-thickness (2.1")
12.5" diameter mirror? I need to do this
with only three 1.25" diameter support points
on an aluminum disc which supports the mirror
cell (no room to maneuver in the bucket holding
the mirror, so there are few if any other design
options possible).

So, this would be a metal-to-metal bond that
could ideally be cut away in the future for
maintenance or cell restructuring.

Any advice appreciated,

gregory



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