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Love the boot! This one was a simple experiment try a small concrete cast. I didn't add that much aggregate (very fine), but I may try again with silica sand unless anyone has suggestions. The final form resembles an ashtray but the mold was simply a small plastic dish I found at the hardware store.
Casting Molds With Voids
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Casting In Pre-made Molds
Mixing + Pouring Concrete
Welcome To Concrete
Hi, Nice sharing.I've made a RGB LED Strip using Arduino Nano herehttp://www.instructables.com/id/How-to-Control-Stunning-RGB-LED-Strip-Using-Arduin/Here is the project:https://easyeda.com/vividz/RGB5050_scroll_bar-yeYR93ltn
If you can't find or afford the crystal you want, you could also make it using plaster. Pour a block, rough-cut it with a junky saw, finish the flats by wet-sanding with sandpaper glued to a board. (you'll go through some sandpaper doing it, which is one reason why you probably don't want to use a sander with its expensive belts) You can fill any holes with more plaster. Wash all the dust off, let it dry completely, wax it good with paste wax and buff. You're good to go, and the wax should act well as a release.
Chocolate Bar Food-Safe Mold & Cast
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Is it possible to use the Venturi device to pull a vacuum in the pressure container...is it strong enough? Can enough vacuum be pulled?
Hi all ! I build aircrafts models in 1/72 scale and I use to cast resin parts, sometimes full kits of rare aircrafts. I use pressure casting, and I always pressure cast silicon molds. I would say the molds have to be pressure cast, I first tried pressure resin casting with non de-bubbled molds and I found the resin was forced in the sub-surface air bubbles of the molds, and the parts were covered with pustules...I also tested vacuum de bubbling, the main problem is the need of a vacuum pump, plus a compressor... Vacuum de-bubbling is faster, as pressure degassing of the silicone molds requires to keep the molds under pressure during the 12 hours or more of their curing...Denis
Do you have any evidence or results to support your claim? Just because you do it in your shop doesn't mean you're following a best practice. After years of working with these materials and talking to technicians at companies like Smooth-On, I've learned that the present tried-and-true best practice for removing air-bubbles in silicone is vacuum de-gassing. That being said, there are many low-tech ways to reduce air-bubbles during silicone mold-making, and pressure casting can be a component in one of those workflows. After talking with some more technicians this week, I've realized that my original comment is a bit extreme - if you are not de-gassing silicone, you can pressure cast in combination with other techniques such as the ribbon pour (and perhaps use certain products that help to reduce air-bubbles), however, I'm told this will only coalesce, not eliminate bubbles. And you will still have the measles problem when you subsequently pressure cast with plastic inside of the mold. When I said "you MUST vacuum de-gas.." what I really meant was - if you intend to pressure cast plastic inside of a silicone mold (which this instructable covers), you will damage your mold unless you de-gas the silicone when making the mold. I personally have used similar techniques to avoid de-gassing but have ruined every single mold I have subsequently subject to pressure casting. This is my experience, but if you have evidence that proves this to be untrue, I'd love to see your results.
You are in fact wrong on this point. RTV silicone can be pressure cast when making your mould. We do this all the time. You simply pour your moulding material into you mould box over the master and stick whole thing in the pressure pot.
If I understand your question, you are asking if you can pressure cast the material of the molding agent. If you are using silicone as your molding agent, it MUST be vacuum degassed or else you will get measles on your casts and your mold will be damaged if you pressure cast.
Thanks !! :)
If I understand your question, you are asking if you can pressure cast the material of the molding agent during the mold-making process as an alternative to vacuum degassing. The simple answer is NO. If you are using silicone as your molding agent, it MUST be vacuum degassed before the mold material is poured or else you will get measles on your casts and your mold will be damaged if you pressure cast.Stay tuned for another instructable that will show how to use this tank as your degass chamber (I've been working on it for a while :)
thank you for sharing
Thank you so much. Saved my day. Tried it with Pololu acc01a and works like a charm!
Thanks for sharing, my first version:TIP122, 330Ohm Resistors, LM7805, Supply 9VNext step: from Breadboard to a shield...Next step: from the Breadboard to a shield :
will it work, if I use 2n2222a transistors?
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