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  • Seaming and Patching Silicone Puppets

    Seriously, I hope you will enter the casting competitionhttps://www.instructables.com/contest/casting/This would certainly qualify.

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  • DrRadium followed blakedouglasyoung5 weeks ago
      • Seaming and Patching Silicone Puppets
  • Seaming and Patching Silicone Puppets

    Thank you very much for posting this! I developed by own method for removing flashing and sprues from solid silicone objects after trying to find one (this wasn't published yet). Even the makers of the silicone had no idea how to finish silicone objects. The method I eventually developed used vibratory polishing with ceramic and then porcelain media to produce a glossy finish after removing silicone with a power sanding method. But the information you supply should help the sanding portion quite a lot. I was already using aluminum oxide, but didn't know not to use silicon carbide. Also I was using keeping the silicone taut at the point being sanded to avoid catching. I suspect that petroleum jelly will help this part of the method be more successful!I hope you will consider enter...

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    Thank you very much for posting this! I developed by own method for removing flashing and sprues from solid silicone objects after trying to find one (this wasn't published yet). Even the makers of the silicone had no idea how to finish silicone objects. The method I eventually developed used vibratory polishing with ceramic and then porcelain media to produce a glossy finish after removing silicone with a power sanding method. But the information you supply should help the sanding portion quite a lot. I was already using aluminum oxide, but didn't know not to use silicon carbide. Also I was using keeping the silicone taut at the point being sanded to avoid catching. I suspect that petroleum jelly will help this part of the method be more successful!I hope you will consider entering the casting competition. I thought about it myself but it would require too much work in too little free time to go back to make all the pictures of SFW objects to do so. But anyone who has tried to remove seams or imperfections from silicone rubber will appreciate your work.

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  • DrRadium commented on erjack1's instructable Rotational Casting Machine5 weeks ago
    Rotational Casting Machine

    Screws and bolts work great on the PVC. That's how I attached mine to the PVC as well. The video didn't upload properly so I uploaded it to YouTube. Here is the URL https://youtu.be/Z7vuvAVYPHc

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  • DrRadium commented on erjack1's instructable Rotational Casting Machine6 weeks ago
    Rotational Casting Machine

    Another solution to the problem of the crank is to motorize it. I've wanted to do this for a while but only recently found a inexpensive motor that worked. I found one on eBay that seems to gave enough torque (12VDC, 15rpm, 1.5A 18W with 40Kg cm torque [= 3.92 N m torque]). Pictures of how it is attached and a video of it moving are shown.

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  • DrRadium commented on erjack1's instructable Rotational Casting Machine2 months ago
    Rotational Casting Machine

    To attach a handle I made an adapter. A PVC tubing cap and coupling are used with some tubing to make an adaptor. A 3/8" hole is drilled and tapped in the PVC cap and the threaded rod screwed into it. The rod is then stabilized by pouring smooth-cast urethane resin into the adaptor and letting it cure. A 3/8" coupling nut has 1/4" holes drilled and tapped on every other side near one end of the nut. Set screws are used in these to hold a hex rod for adapting to a drill, or to the hex wrench used for garbage disposals as a crank handle. The other end is slipped onto the PVC pipe that this the outer rotational axis and help in place with coarse drywall screws. It isn't pretty but it works.

    I'm interested in how you attach molds. I am using a cassette made from plywood but it is clumsy and takes forever to change molds.

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  • How to Make an Electric Foundry for Metal Casting

    Thanks for the instructable and the you tube post on this. I built a slightly larger square one along with steel tube crucibles. It works quite well but I find that the heating wire tends to slip out of the channels after a short time. This tends to result in the heating wire sagging and making contact with other sagging wire. At best this creates wire breaks at worst complete heating wire meltdown. Because the wire gets quite brittle pushing it back i to the grooves also tends to produce breaks. Have you had problems with this and if so, how did you address them?I have seen one build that suggests leaving a lip to keep this from happening but I've found it less than trivial to do this so I was hoping for simpler solution.

    Oh and one comment to anyone making this or any other design with a solid state relay. As I discovered, they don't completely turn off power, they just cut current to a trickle but at the same voltage. So even when the pid controller has the relay turned off you can still be shocked. Not to a fatal degree, just an alarming one.

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  • DrRadium commented on tobychui's instructable PLA 3D Prints Smoothing Research Project11 months ago
    PLA 3D Prints Smoothing Research Project

    I've used a heat gun to help smooth really rough spots. Doesn't make things really smooth. Works better for places where the print quality is poor.

    Xtc3d is an epoxy resin. It does work well though I have had occasional problems with it wetting some areas. Cleaning well with soap and water as well as mineral spirits helps prevent this problem. Also it isn't good for spot fills. Kind of all or nothing.

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  • Mold Making: Glove Molds and Mother Molds

    You mention in regards to casting silicone:"If your'e going to make silicone parts you either need to find a silicone sealant or go with a soft urethane mold."Many cast silicone projects require body safe materials, and that means platinum silicones (aka addition cure silicones). These have problems curing when in contact with some materials including most urethane rubbers. Usually platinum silicone rubber molds are used along with a suitable mold release to prevent the silicone being cast from sticking to the mold One that works very well is Mann Ease-release 200

    Another thing to note is that typically this cut is made in s zig-zag pattern in order to help align the mold.

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  • Making & Soldering an ESP-07 Breakout Board

    When I've done it, I've used a larger diameter solder. That way you aren't really feeding the solder in, All that you need is the tiny bit at the end of the held strand of solder. Alternatively, heat what you are applying solder to, move the iron to the solder feeding the solder onto the tip of the iron, then back to where you are applying solder. Keeping in mind the distances involved need to be in the single digit millimeter range.

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  • Making & Soldering an ESP-07 Breakout Board

    "If you other hard is hold the forearm of the soldering hand, how did you hold the solder in place?" The third hand tool. Which also hold the pieces being soldered.

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  • Controlling simple LED Bar Graph with Arduino

    Unfortunately I do not. I picked them up from Vetco and they didn't provide any data But I check the website and they have it there: https://vetco.net/products/12-led-bar-graph-module)I searched the provided supplier code without success. But the online Vetco info shows a picture with the LED lit by 6V with a 40 ohm resistor, so I'm guessing that is adequate.

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  • Controlling simple LED Bar Graph with Arduino

    Any suggestions as to correct resistor value for a 12LED graph?

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  • DrRadium commented on audreyobscura's instructable World's easiest silicone mold.2 years ago
    World's easiest silicone mold.

    Actually, you don't have to glaze it. SuperSeal from Smooth-on seals porous surfaces and is specifically made for this purpose. It comes off with warm water.https://www.smooth-on.com/product-line/superseal/

    The one part silicone that cures with moisture sticks to things, which is why it is used as a caulk. But cured two part silicones (tin or platinum) won't stick to any nonporous surface except the same type of silicone. While mold release will prolong the mold life; it is really only critical when casting silicone of the same type. Note that tin silicone inhibits cure of platinum silicones.

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  • Cheap and Easy Lab Agitator / Shaker (Great for PCBs too!)

    For the author or anyone else who made one: how long did the motor last in continuous use?

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  • DrRadium commented on Aperition's instructable Make A Candle From Cheese 2 years ago
    Make A Candle From Cheese

    I have used these as campfire starters on many occasions, and they work great. You don't even need to make the candle. The "handy cheese opening mechanism" works well enough to get the wax melting on on the tinder, where the tinder now starts to get coated and acts like a wick. I've always taken them with me when camping. Despite what the package says, in my experience, the wax wrapped cheese stays just fine for at least 5 days at moderate pacific northwest temperatures. Maybe not so much at higher temps but check out the comment from INSAYN regarding his babybel longevity experiments at: http://www.expeditionportal.com/forum/archive/ind...Specifically: "BabyBel Cheese Round Singles in wax coating (An assortment of flavors) I tested one of these by placing in the ...

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    I have used these as campfire starters on many occasions, and they work great. You don't even need to make the candle. The "handy cheese opening mechanism" works well enough to get the wax melting on on the tinder, where the tinder now starts to get coated and acts like a wick. I've always taken them with me when camping. Despite what the package says, in my experience, the wax wrapped cheese stays just fine for at least 5 days at moderate pacific northwest temperatures. Maybe not so much at higher temps but check out the comment from INSAYN regarding his babybel longevity experiments at: http://www.expeditionportal.com/forum/archive/ind...Specifically: "BabyBel Cheese Round Singles in wax coating (An assortment of flavors) I tested one of these by placing in the window sill facing South for nearly 3 weeks. House is usually 67º-70ºF and the window sill saw upwards of 85ºF. After sitting there all that time, I tried it and found no issue with the flavor, texture, or usefulness in eating or cooking with." Not all that surprising. Cheese was made as a way of storing milk before refrigeration. And this use really is a very practical survival technique as being able to start fires in survival situations can be critical.

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