[sdiy] I've got one word for you: Plastics

[cheater cheater]

Let me say the results look great. Wow! I didn't realize it could be that easy!

D.

On Sun, Jan 31, 2010 at 16:10, Jerry Gray-Eskue <jerryge at cableone.net> wrote:
> Richard,
>
> The result looks nice, did you need to use vacuum or vibration when you
> pored the plastic into the mold to eliminate air bubbles?
>
> - Jerry
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Richard Kirk
> Moore (rkmoore)
> Sent: Sunday, January 31, 2010 8:49 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] I've got one word for you: Plastics
>
>
> The plastic that I was complaining about before has cured harder than I
> thought at first.  While not perfect, I think the resulting keys will work
> nicely for my organ.  I haven't messed with trying to dye the plastic to the
> proper beige, but that's not a major concern for me.  For anyone curious, I
> took a few pictures of the process that can be seen here:
>
> https://umdrive.memphis.edu/rkmoore/sdiy/keymoldmosaicsmall.jpg
>
> Thanks to everyone for the information!
>
> -Richard
>
>
> ________________________________________
> From: kheck73 at aol.com [kheck73 at aol.com]
> Sent: Thursday, January 28, 2010 9:38 PM
> To: Richard Kirk Moore (rkmoore); synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] I've got one word for you: Plastics
>
> I've worked in materials testing labs where mounting compounds are used to
> prepare samples for sectioning and analysis. One family of compounds are
> cold curing plastics, epoxy, polyurethane, and acrylic. The mixture is
> usually of a liquid and a powder. The two big companies that make the
> supplies are Struers (struers.com) and Buehler (buehler.com). Look under
> "cold mount consumables". I worked mostly with the epoxies, and they set
> really hard. I believe we coated the molds with some sort of release
> compound like a talcum powder, but its been a while ago and my memory is
> fuzzy. It cures clear or with a yellowish hue to it. I see Struers has color
> dyes you can add to some of the epoxies and acrylics, but I don't see white
> or black. You might be able to cast the key, roughen the surface a bit with
> fine grit paper, then give it a shot of gloss paint, but I don't know how
> well it would stick.
>
> -Karl.
> -----Original Message-----
> From: Richard Kirk Moore (rkmoore) <rkmoore at memphis.edu>
> To: synth-diy at dropmix.xs4all.nl <synth-diy at dropmix.xs4all.nl>
> Sent: Thu, Jan 28, 2010 8:27 pm
> Subject: [sdiy] I've got one word for you: Plastics
>
>
> Hi everyone,
>
> It's been a long time since I've posted anything.  My current project is
> getting
> my Hammond H-111 organ fully operational.  It's in strikingly good
> condition,
> but several of the 50-year-old plastic keys have broken.  Instead of buying
> someone else's 50-year-old keys pulled from a donor organ, I am trying to
> cast
> new ones.  Using a Smooth-On OOMOO 30 silicone rubber and Smooth-Cast 300
> urethane plastic I have made a mold and cast a key.  The resulting key is
> good
> and mounts in place nicely, but the new plastic is not quite as rigid as the
> original one.  As an EE, materials science is pretty far outside of my
> working
> knowledge.  Does anyone know of a better plastic that I could use at home
> for
> key casting?
>
> Thanks,
> Richard
>
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