Epoxy resist?
 

I'm modifying a cheap plastic film camera to do 'B' shots (star trails) and
I need to fix a pivot to the case; a small blade passes though a slit to
push against the original shutter so it'll stay open. I would like to
solder a shaft to the blade and epoxy blobs to the ends of the shaft so
they are held but free to turn. Grease? bakers parchment paper?

Epoxy resist?
 

On Feb 15, 9:39*am, _
wrote:
I'm modifying a cheap plastic film camera to do 'B' shots (star trails) and
I need to fix a pivot to the case; a small blade passes though a slit to
push against the original shutter so it'll stay open. *I would like to
solder a shaft to the blade and epoxy blobs to the ends of the shaft so
they are held but free to turn. *Grease? *bakers parchment paper?

Scotch Magic tape is what I use on woodworking projects, you have to
time it just right so the glue is set, but not too set to get it out
of the corners. For your application, you could probably let it set
up hard before pulling the tape. You might want to check first to see
that the backing doesn't dissolve in the epoxy.

Stan

Epoxy resist?
 

Epoxy resist?
 

On Mon, 15 Feb 2010 22:53:01 +0000, IanM
wrote:

PVA (PolyVinyl Alcohol - NOT white glue!)

Had a row with my woodwork teacher at the age of 12. He was bigger than me and
won. But I was right!

:-)


Mark Rand
RTFM

Epoxy resist?
 

On Mon, 15 Feb 2010 16:39:38 GMT, _
wrote:

I'm modifying a cheap plastic film camera to do 'B' shots (star trails) and
I need to fix a pivot to the case; a small blade passes though a slit to
push against the original shutter so it'll stay open. I would like to
solder a shaft to the blade and epoxy blobs to the ends of the shaft so
they are held but free to turn. Grease? bakers parchment paper?

The term you want is "release agent". Petrolatum (Vaseline) works.
Kiwi neutral shoe polish is the preferred release agent of at least
one guy who beds rifle actions in epoxy for high accuracy.

Epoxy resist?
 

IanM writes:

Otherwise the 'gold standard' mould release
for fibreglass work is PVA (PolyVinyl Alcohol - NOT white glue!) and if
you know anyone in the trade you may be able to beg a little bottle
full.

Polyvinyl alcohol used to be sold as a hard contact lens wetting solution.

Epoxy resist?
 

In article , Richard J Kinch wrote:
IanM writes:

Otherwise the 'gold standard' mould release
for fibreglass work is PVA (PolyVinyl Alcohol - NOT white glue!) and if
you know anyone in the trade you may be able to beg a little bottle
full.

Polyvinyl alcohol used to be sold as a hard contact lens wetting solution.

No, not really. PVA was one ingredient, but by no means the entire solution.

Epoxy resist?
 

Doug Miller writes:

No, not really. PVA was one ingredient, but by no means the entire
solution.

Your usual useless comment.

You are entirely correct, the product is mostly water, not pure PVA, with a
bit of preservative. Which has nothing to do with the application.

Now tells how atoms are mostly empty space.