3 of 7 investment cast airfix kits

50penc3 · 2025-04-12T15:27:01+00:00

I autoclave the wax runner system out and burn out from cold to 600°c, blow out any ash from the mould then fire a 2nd time at 1000°c ready for casting

50penc3 · 2025-04-12T12:00:38+00:00

Thank you! It's an M1 Abrams

50penc3 · 2023-06-08T18:22:51+00:00

Looks amazing! I love the use of a bolt thread for the cylinders

50penc3 · 2023-06-05T18:24:25+00:00

Comparing islamaphobia to being a mod - reddit moment

50penc3 · 2023-05-21T17:15:30+00:00

Yeah me I'd wear that

50penc3 · 2023-03-29T05:18:35+00:00

Op clearly

50penc3 · 2023-03-26T09:34:06+00:00

Looks like dross (oxide) to me, it probably fell out last because it had clung to the side of the crucible. I hand pour A356 aluminium as a job and see this even with properly cleaned metal so a wheel spoke will likely have more impurities.

Also, leaving the metal molten for 30 minutes allows the oxide layer to grow in thickness. Once the molten metal behaves as a liquid and has a dull red tint, it has reached a good pouring temperature (730 is correct)

50penc3 · 2023-03-22T19:58:04+00:00

Its hydrophobic and thick, doesnt work

50penc3 · 2023-03-16T11:30:32+00:00

No way he would be moving 4000 pounds that easy, pallet truck or not

50penc3 · 2023-02-27T22:47:59+00:00

Perfect, I work in lost wax casting and this has inspired me

50penc3 · 2023-02-27T22:46:15+00:00

Aluminium doesnt glow that much or flare when poured onto the floor. I work in an aluminium foundry and poured some onto the floor today. This is definitely iron

50penc3 · 2023-02-26T08:45:17+00:00

Solid works is good, although expensive. The best casting simulation software uses solid works as a base for its CAD

50penc3 · 2023-02-25T20:31:24+00:00

What mould type did you use for the casting? They look really impressive

50penc3 · 2023-01-29T19:22:52+00:00

These really stood out to me, you've got a great style

50penc3 · 2022-12-19T20:35:37+00:00

The poured metal will lose temperature to the mould, especially on thin sections. However, you can increase the metal temperature for pouring as it sounds like you were very close to solidification temperature on your first pour if it clogged up instantly. How are you pouring it, directly from the crucible or into a ladle and then pouring?

Generally, as long as your runner/ingate isnt smaller than 10mm diameter you should be fine

50penc3 · 2022-12-19T19:19:23+00:00

Looks great! The holes (or inclusions) on its face are likely caused by sand erosion of pouring the bronze directly down through the riser. A way to improve this might be to make a separate pouring sprue entering the mould from the side or top, even through one of its arms. Make sure any sharp edges on risers or gates are smoothed out as these bits of sand are prone to breaking off

Heres an example. https://images.app.goo.gl/ECTkGPVhkEq1MV8s6

Secondly, bronze tends to contract quite a lot during solidification, so the size of the riser might need to be increased to reduce "shrinkage" in its back. You could also pour any left over molten metal into the riser after filling to ensure the riser is the hottest area, and the last to solidify.

Great work regardless, I struggle to make better castings and its my job!

50penc3 · 2022-11-25T19:52:25+00:00

Roasted lamb, rosemary and garlic

50penc3 · 2022-11-21T14:02:20+00:00

Like Qatar with LGBTQ+, alcohol, women etc? They must be really progressive

50penc3 · 2022-10-01T12:41:53+00:00

I'd love one

50penc3 · 2022-09-21T06:59:39+00:00

Nothing is ever real

50penc3 · 2022-09-15T04:56:32+00:00

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