#CodysLab #video #casting iron from #thermite made with pop-top can tops in Petrobond in an outdoor desert location. He had to stir the mix with his dedicated thermite shovel to keep it from petering out, severely damaging the shovel.
on 02026-05-26#video on #casting bronze with sand cores made from sand and 5 wt% #waterglass #materials rather than, as in his previous video, molasses and flour. He got his waterglass from a pottery supply store and gas-cured it in a ziploc. He’s using hose clamps on a split pipe for his mold for the core. With 5% he can still break it by hand after curing.
on 02025-11-14#Giestas #video on #manufacturing cork-filled-agar-soled sandals using a corrugated-sole mold made from corrugated cardboard. The cork came from diced wine corks ground in a coffee grinder and sifted with a kitchen sifter to separate into cut, coarse, medium, and fine grades. 3 parts glycerin plasticizes 4 parts agar. A tiny amount of charcoal, ground in a mortar, is an additional filler for color. #Casting the heavily filled gloop in the cardboard mold looks fiddly. Used-tea-leaf tannin colors the alginate “leather” straps: 1 part alginate, 2 parts glycerin, 30 parts brown water, apparently by volume. The leather is crosslinked with a spray of 1 part CaCl₂ in 10 parts water. A box cutter tracing a masking-tape strap model tested over a sock cuts out the straps, which fit between the bottom sole and a lighter “midsole” made with 3 parts agar to 2 parts glycerin filled with coarser cork. Then the upper sole (insole) is softer, 1 part agar to 1 part glycerin filled with fine cork pigmented with mortar-ground tea leaves. Baked 1 hour at 100° with the fan on. #materials
on 02025-10-18#Giestas #video on #manufacturing an egg-shell-filled bioplastic bowl: 100mℓ water, 10mℓ glycerin, 15g agar, 2 drops clove oil, 100g eggshell (membrane removed, soapy-water-cleaned, oven sterilized, ground with mortar and pestle). So I guess the product is about 80% eggshell. He uses two glass bowls as the mold for #casting the thicker bowl. #materials
on 02025-10-18#video on #casting ingots in a microwave kiln #toread
on 02025-10-18#video of #casting plaster of Paris and polyurethane in a high-density remeltable gelatin mold (50g water, 40g gelatin, 40g glycerin, but stronger if gelatin goes to 90g, maybe also with 2tbsp powdered sugar) without even a mold release. Alcohol spray to pop bubbles at the surface. #materials
on 02025-10-18#video on #jugaad #vacuum setup using bicycle check valves (Dunlop type) for the vacuum, a plastic syringe as the pump, and a glass jam jar as the vacuum chamber. You can melt holes in the polyethylene syringe with a soldering iron to mount a Dunlop valve for egress. Sealed airtight with epoxy, which probably isn’t as good as sealing wax but is probably just as good as the rest of the plastic syringe. A sawed-off Dunlop valve in a drilled hole in the jar’s metal lid serves as a hose fitting for a zip-tied rubber (?) hose to connect the syringe. At 3'50” there’s a demo of using it to degas epoxy for #casting. At 6'10” a demo of degassing two-part silicone.
on 02025-10-18#manufacturing small articles from superglue, and baking soda, in blu-tack molds? Repeating thin alternating layers of superglue and baking soda (he says “baking powder” but I suspect he’s confused) work best. Round-trip time is very quick, only a couple of minutes. At first I thought he might be using fillers but actually he just painted the parts after #casting. The process of removing the form from the blu-tack introduced noticeable distortion into the overall shape. #video
on 02025-10-18you can use #gelatin for #casting plaster and similar #materials instead of silicone? For some reason the author mixed 2 parts gelatin, 1 part honey, 2 parts glycerin, 1 part water, and for a mold release, cornstarch or talcum powder.
on 02015-08-15