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Making knobs with casting resin progress...
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h8mtv
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Joined: 11 Apr 2011
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Location: Virginia

PostPosted: Fri Oct 11, 2013 2:24 pm    Post subject: Making knobs with casting resin progress... Reply with quote

So a few of you have been tuned into the search for Bronco knobs. I had been trying to make a few clones for myself as well as clone some old radio and other knobs for projects. Here are a few of what I made earlier this week. I am pretty pleased. These are drilled, tapped, ready to rock. The one I soaked in a jar of coffee for a few days to see how it would do.



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cur
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Joined: 18 Jan 2009
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PostPosted: Fri Oct 11, 2013 2:29 pm    Post subject: Reply with quote

Cool stuff! Not long ago I was interested in figuring out how to cast stuff and spent a bit of time looking into it, but never pursued it. description or pics of the process would be fun to see.
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finboy
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PostPosted: Fri Oct 11, 2013 2:52 pm    Post subject: Reply with quote

Excellent progress!
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Narco Martenot
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PostPosted: Fri Oct 11, 2013 3:57 pm    Post subject: Reply with quote

Awesome! Nice work!
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taylornutt
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Joined: 17 Sep 2009
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PostPosted: Fri Oct 11, 2013 4:11 pm    Post subject: Reply with quote

Are those knobs on the right from the old Sovtek Big Muffs?


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HNB
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Joined: 15 Apr 2012
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PostPosted: Fri Oct 11, 2013 5:29 pm    Post subject: Reply with quote

Awesome work man! Great job. Smile Solid metal castings would be pretty rad with those templates. Smile
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h8mtv
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PostPosted: Fri Oct 11, 2013 9:30 pm    Post subject: Reply with quote

taylornutt wrote:
Are those knobs on the right from the old Sovtek Big Muffs?



Ding ding ding Smile
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taylornutt
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PostPosted: Fri Oct 11, 2013 9:54 pm    Post subject: Reply with quote

Have you put these knobs on anything yet? Does the resin only come in white?
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h8mtv
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PostPosted: Fri Oct 11, 2013 10:05 pm    Post subject: Reply with quote

I actually just started a black one.
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h8mtv
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PostPosted: Fri Oct 11, 2013 11:17 pm    Post subject: Reply with quote

The white is least expensive. The other options are clear and then you tint them with transparent or opaque dyes. I am mostly sticking with Smooth-On stuff. It is known to be best. I built a pressure tank with a 2.5 gal paint pressure tank. I bought a set of canisters for my food saver vacuum sealer. I mix the rubber in solo cups, vacuum out the bubbles in the silicone then pour the mold. Once I have the mold made I cast it under about 50 psi . I also have had much clearer results with the transparent stuff when I warm the molds on a coffee cup warmer.
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h8mtv
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PostPosted: Fri Oct 11, 2013 11:22 pm    Post subject: Reply with quote

Let's see if this works.
http://imageshack.us/a/img716/5190/vru1.jpg
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ekwatts
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PostPosted: Fri Oct 11, 2013 11:36 pm    Post subject: Reply with quote

I thought you only really needed the whole vacuum process when the piece has all sorts of undercuts and fine details. Even then I've only ever used a vibrating table for really complex pieces and they've come out fine.
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h8mtv
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PostPosted: Fri Oct 11, 2013 11:48 pm    Post subject: Reply with quote

I had problems with bubbles in molds and casting. The vacuuming the silicone before pouring it helps a lot and pressure in casting is pretty much essential with this resin. It is solid and fine to handle in 30 minutes.
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DGNR8
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PostPosted: Sat Oct 12, 2013 12:02 am    Post subject: Reply with quote

They look great. Hope you perfect colors.
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h8mtv
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PostPosted: Sat Oct 12, 2013 12:10 am    Post subject: Reply with quote

Black looks good so far. I did a transparent red one and a clear with a seed as a marker for a buddy. I'd like to get into polishing the clear stuff. Can't be hard.
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ekwatts
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PostPosted: Sat Oct 12, 2013 12:58 am    Post subject: Reply with quote

If the clear stuff has casting blemishes try painting over the area with gloss acrylic varnish, or even modelmakers water effects (it's basically a pre-mixed transparent resin).
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h8mtv
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PostPosted: Sat Oct 12, 2013 1:54 am    Post subject: Reply with quote

Sweet, I'll try that. Thank you.
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h8mtv
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PostPosted: Sat Oct 12, 2013 3:03 am    Post subject: Reply with quote



Uploaded with ImageShack.us

Enclosure lid.



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And a Sovtek knob.
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h8mtv
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PostPosted: Sat Oct 19, 2013 1:36 am    Post subject: Reply with quote

http://imageshack.us/a/img542/7495/zq8j.jpg

Bunch of Sovtek knobs done.
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finboy
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PostPosted: Sat Oct 19, 2013 4:41 am    Post subject: Reply with quote

Got any more aged white sovtek knobs?
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