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Post by birkie on Mar 26, 2018 13:03:34 GMT
The old ones are 4 3/8ā x 9 1/4ā That's huge. Is the surface towards the back of the evaporator a curved shape? If the aluminum one were much longer, it looks like it would start impacting the hemispherical surface at the rear.
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Post by birkie on Mar 26, 2018 13:17:05 GMT
Yes aluminum and bronze. Copper I haven't tried. Cast iron, no but I know someone who may still do it and is setup for large scale sand casting. Lost foam would be easiest. My setup is just a hobby one. Amazing - eager to see how it works out! Be careful - once you have a nice newly cast freezing block, you're going to start wanting a machine that fits it
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mach
7 Cubic Foot
Posts: 135
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Post by mach on Mar 26, 2018 15:22:42 GMT
Never say never birkie but my white whales are a 34/35 Crosley Shelvadore and/or a 41 GE double wide PB-16. I'll likely never see either in the wild but find one of those...well, we'll see how deep this rabbit hole goes š
Travis do the bigger ones go in a evaporator of the same inner diameter as the smaller ones? In other words, is the rounded side the same radius?
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mach
7 Cubic Foot
Posts: 135
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Post by mach on Apr 18, 2018 3:22:29 GMT
I was able to laser cut the profile shapes. Working on the hot wire knife now. The plan is to cut them from pink foam, coat in dry wall mud and bury in sand then lost foam cast them in aluminum and everdur . The 104% is a test to allow for shrinkage.
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Post by birkie on Apr 19, 2018 1:46:12 GMT
I was able to laser cut the profile shapes. Working on the hot wire knife now. The plan is to cut them from pink foam, coat in dry wall mud and bury in sand then lost foam cast them in aluminum and everdur . The 104% is a test to allow for shrinkage. Nice! Out of curiosity, what is the drywall mud for? Is it to provide a smooth surface?
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mach
7 Cubic Foot
Posts: 135
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Post by mach on Apr 19, 2018 1:57:23 GMT
It acts as barrier between the foam and the sand. It holds the negative shape long enough for the metal to cool and prevent sand inrush.
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mach
7 Cubic Foot
Posts: 135
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Post by mach on May 27, 2018 23:08:31 GMT
Finally got the hot wire cutter dialed in. It'll be a couple of weeks before I can cast these. Playing around with a GE logo. Interested to see if this turns out. Coated in drywall mud and embedded in sand
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Post by turbokinetic on May 28, 2018 15:48:44 GMT
...... before I can cast these.
Wow, can't wait to see how these turn out. Love the home foundry projects.
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mach
7 Cubic Foot
Posts: 135
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Post by mach on Jun 9, 2018 16:54:50 GMT
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Post by ckfan on Jun 9, 2018 22:27:38 GMT
Oh man. Now I really need to get my DRA working!
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Post by timeswelding on Jun 10, 2018 18:00:59 GMT
Oh man. Now I really need to get my DRA working! Ray, our DRAs have a bastard evap. It is shorter than the standard pig. I have a GE freezing block in mine because it accommodates a square bourbon bottle nicely. But it does hang out of the evap a bit. Just shy of the inner door skin.
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Post by ckfan on Jun 11, 2018 2:29:58 GMT
Oh man. Now I really need to get my DRA working! Ray, our DRAs have a bastard evap. It is shorter than the standard pig. I have a GE freezing block in mine because it accommodates a square bourbon bottle nicely. But it does hang out of the evap a bit. Just shy of the inner door skin. I completely forgot about that Doug. You are right! I guess a person could cut one down to size if need be. There are far fewer DRAs out there vs the normal pig evaporator size.
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Post by birkie on Jun 12, 2018 11:07:08 GMT
Had some time this weekend to do a test run on the casting. Likely too hot given the porosity but enough to test the size. Birkie, can you pm me your mailing address?] Very cool, they look quite nice; glad to hear that this technique holds promise. PM sent.
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Post by birkie on Jun 27, 2018 0:55:30 GMT
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Post by ckfan on Jun 27, 2018 2:04:35 GMT
This is so cool. Thank you so much Mach. This is a very needed missing piece for the earliest models. Iām sure it really helps with the freezing capacity. Now I want to learn about this new DR2!
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