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'[EE] Electronics in clear resin'
2012\04\16@182134 by V G

picon face
runawaybrainz.blogspot.co.uk/2012/04/audio-crystal-cmoy-freeform-headphone.html

This is simply beautiful. I'm inspired to make something and cover it with
resin. Probably a nice bright LED clock or something visual like that.
Should look really nice

2012\04\16@191506 by IVP

face picon face
> http://runawaybrainz.blogspot.co.uk/2012/04/audio-crystal-cmoy-freeform-headphone.html

Good job. He was lucky with the curing temperature. Not because
of destroying components but because the expansion can cause
'silvering' where the resin lifts off. I'd perhaps have gone for 0.5%
catalyst (which also gives the bubbles more time to escape)

> This is simply beautiful. I'm inspired to make something and cover it
> with resin. Probably a nice bright LED clock or something visual like
> that. Should look really nice.

I once made the mistake of encapsulating using a round margarine tub
as the mold. Which was made from polystyrene. Fortunately the resin
gelled before the tub completely dissolved, but it took a lot of elbow
grease and Brasso / Silvo to get the finish I should've got in the first
place

I've got almost a kilo of silicone mold rubber to use up before it goes
past its expiry date. The link is an inspiration, thanks

The last arty thing I made was for a friend. At the hard-gelled stage
of a block of clear resin he shot it with a nail gun, which shattered it
internally but left the surface relatively intact. He has a small red laser
pointer under it, looks good in a corner, throwing shards of light as
it does, but I think a couple of RGB LEDs might be better

2012\04\16@202001 by V G

picon face
On Mon, Apr 16, 2012 at 7:14 PM, IVP <spam_OUTjoecolquittTakeThisOuTspamclear.net.nz> wrote:

> I once made the mistake of encapsulating using a round margarine tub
> as the mold. Which was made from polystyrene. Fortunately the resin
> gelled before the tub completely dissolved, but it took a lot of elbow
> grease and Brasso / Silvo to get the finish I should've got in the first
> place
>

What material should the mold be made of?


> I've got almost a kilo of silicone mold rubber to use up before it goes
> past its expiry date. The link is an inspiration, thanks
>

What is the silicone mold rubber used for and how does one use it?


Also, do you know what resin he is using? Or something similar available in
Canada

2012\04\16@204426 by John Gardner

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One of your propane nail guns

2012\04\16@212040 by IVP

face picon face
> One of your propane nail guns?

It was a butane-powered Paslode. Actually hired to figure
out how they kept it firing well at low-temperature, which
was a requirement for another butane project

http://www.paslode.co.nz/B30090.cf

2012\04\16@220118 by IVP

face picon face

> What material should the mold be made of?

Definitely not polystyrene because there's a lot of free styrene
monomer, which is quite an aggressive solvent that will attack
polystyrene and other plastics before it polymerises

Laminating film is good, just about nothing sticks to it. Glass is
OK too but you have to watch the catalyst level. More catalyst,
say over 1%, causes the resin to heat up noticeably as it cures.
When it cools and contracts it naturally pulls away from the glass

Which should be well-polished with wax or mold release BTW

If you use a lower catalyst level, for example with big pourings
with a low surface to volume area ratio you don't want to overheat
(they'll crack. In the lab we'd even have them catch fire if too much
promoter was in the resin), the downside is that the surface doesn't
move so much. What can happen then is that a part of the surface
may be left stuck to the glass, whilst the rest has shrunk away from
it, and leave a proud section like a thin scab

For my coasters I use spun stainless steel molds. All metals are OK
but the gloss you see on it is what you get, eg aluminium is easy to
work with but will always produce a dull finish

Most woods work but some have oils in that really interfere with the
cure. I can't use some NZ native woods without precoating them with
nitrocellulose laquer

> What is the silicone mold rubber used for and how does one use it?

Silicone mold rubber can be used to take castings of eg odd shapes.
Once cured it's very unreactive (it won't even stick to itself so you
can't modify a mold by adding bits). It's tough too and won't tear
on undercuts etc. For example you can turn the mold inside out to
remove the casting. Silicone rubber also lasts a long time and many
many castings can be made with one mold

On occassion I've used plasticine/plaster with a smear of vaseline
for a quick casting

Air (oxygen) is a ploymerisation inhibitor. So if you were casting in
an open box, a piece of laminating film or metal to cover the exposed
surface will ensure it cures hard. If you don't, the exposed surface will
stay tacky for quite some time after the body has cured

> Also, do you know what resin he is using? Or something similar
> available in Canada?

Any company which sells fibreglassing resin will sell water-clear as
gel coat for example, or specifically for casting

eg http://www.fiberlay.ca/Fiberlay_Casting_MoldMaking.pdf

Fun for all the family. If they don't mind the smell that is. You would
not be poular doing this in the kitchen. I have my own shed/workshop
to do things like this in. And make sure you buy some acetone and rags
too. It's the best and cheapest way to clean up

There are a lot of fillers and glycol-based pigments too. I collect and
use the very fine MDF dust from my belt sander for instance. The cast
can be painted and shaped quite easily but overall is very much harder
than MD

2012\04\16@221621 by John Gardner

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Vapor pressure of butane @ -15C leads one to suspect it's
not at -15C..

2012\04\17@033852 by RussellMc

face picon face
1, Don't try this at hone
2. Don't smoke while you are not trying it.

> Vapor pressure of butane @ -15C leads one to suspect it's
> not at -15C...

Tip LPG barbeque gas tank on side with valve slightly downhill.
Open valve fully so gas roars out.
After a few seconds starts to spit then produces more liquid then
much liquid as temperature drops. Soon there is a rivulet of liquid
propane/butane mix running down the bank.
Unusual.

Russel

2012\04\17@112108 by John Gardner
picon face
Liquid feed is what I was guessing. Maybe not, though. A
uC could sort out solenoid-on time ("fuel injection", it says)
wih a temp sensor & lookup table.

I'd be interested in a solenoid valve that small..

2012\04\17@185740 by Oli Glaser

flavicon
face
On Mon, Apr 16, 2012 at 11:21 PM, V G <.....x.solarwind.xKILLspamspam@spam@gmail.com> wrote:

>
> http://runawaybrainz.blogspot.co.uk/2012/04/audio-crystal-cmoy-freeform-headphone.html
>
> This is simply beautiful. I'm inspired to make something and cover it with
> resin. Probably a nice bright LED clock or something visual like that.
> Should look really nice.
>

2012\04\17@191411 by William \Chops\ Westfield

face picon face

On Apr 16, 2012, at 7:01 PM, IVP wrote:

>> What material should the mold be made of?

> [long list of rather exotic mold materials.]

The usual molds that I've seen in "craft-class" kits are polyethylene, which is pretty solvent-immune.  (These were relatively old kits; I think nowadays silicone is more common.  You can get some interesting shapes sold as ice-cube trays…)

BillW

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