Marell le Fou
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Marell le Fou
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Joined: December 13th, 2016, 10:21 pm

January 23rd, 2017, 4:31 am #11

For my part i see two options.

- Resina casting with a magnet glues on one side.

- Bigger magnet casted in the middle of the piece, and same on the other side. The magnet, if powerfull enough, will attract each other without damaging the pieces. But it could be hard to deal correctly with the polarisation.
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RingofGyges
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RingofGyges
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Joined: January 19th, 2017, 4:23 am

February 7th, 2017, 10:05 pm #12

Some early tests have mixed results for iron powder.  I got some iron fileings about the size or fine sand and added them to my plaster mix.  A couple troubles:  1) The iron wants to settle to the bottom of the mixing cup and despite my efforts at vigorous mixing I got about half the blocks with very little iron (from the top half of the cup) and a sludgy slurry for the other half.  The blocks that didn't get enough iron don't attract the magnets at all.  The blocks that *did* get a lot of iron mostly crumble into chunks once they're dry.  I only got a few blocks out of the process that were both able to attract a magnet and reasonably strong.  I'm sure practice would improve the results (I'd get better at mixing evenly, I'd learn more about how much iron to use, etc...) but the initial test was pretty discouraging.

Washers embedded in flat floor panels worked much better.  Easy, tidy, didn't noticably effect the strength of the brick, and make a nice bond with the magnet.  I think that's the avenue I'm going to explore going forward.
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3d6.dungeonmaster
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3d6.dungeonmaster
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Joined: June 14th, 2018, 4:47 pm

June 14th, 2018, 6:18 pm #13

I used to work in the newspaper industry. When the circulation department needs to verify a coin mechanism works for dispensing newspaper they use "slugs". They are the same shape, size and weight of a quarter and fit nicely in a one inch mold. The only place I have found them online in bulk is here: http://www.kjack.com/accessories.htm and  https://www.mernewsrack.com/coin-opera ... er-parts/ . As they are the size, shape, and weight of quarters and can be used for nefarious purposes they are a bit of a controlled purchase (meaning you might have to work for newspaper in order to actually buy them). I would visit the local newspaper in your area, talk with the circulation department manager and ask if it's possible to buy/take a few for crafting purposes and go from there.
Molds: 18, 46, 59, 70, 71, 72, 73, 82, 85, 202, 205, 264, 266, 281, 282
Visit my online gallery, and watch for project updates: https://tenfootpolenotincluded.wordpress.com/
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Marell le Fou
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Marell le Fou
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Joined: December 13th, 2016, 10:21 pm

June 18th, 2018, 2:40 am #14

I don't understand ow you would use them ?
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3d6.dungeonmaster
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3d6.dungeonmaster
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Joined: June 14th, 2018, 4:47 pm

June 19th, 2018, 6:42 pm #15

Similar to using washers, during casting, you pour a little hydrostone, plaster, whatever into the mold, and then the slug, then more hydrostone. As it dries and settles you are left with a mettle slug inside your plaster that you can pick up with a magnet or have it adhere to a magnetic surface. This way you don't have to worry about polarity. It's an idea I have been playing with for a while but have yet to really use it for mass production.
Molds: 18, 46, 59, 70, 71, 72, 73, 82, 85, 202, 205, 264, 266, 281, 282
Visit my online gallery, and watch for project updates: https://tenfootpolenotincluded.wordpress.com/
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Marell le Fou
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Marell le Fou
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Joined: December 13th, 2016, 10:21 pm

June 22nd, 2018, 5:00 am #16

But wouldn't common rings for DIY works better ? I use them to magnetise my stuff. Cheaper than everything and easily affordable at the next drugstore. And available in several sizes.
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mdphilps
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mdphilps
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Joined: April 4th, 2018, 6:20 am

July 12th, 2018, 10:30 am #17

Or just use a quarter - they only cost 25 cents. 😜
Molds: 57 58 59 70 71 75 85 177 178 179 206 222 223 224 701 702
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Galileo
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Galileo
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Joined: June 2nd, 2005, 7:26 pm

July 13th, 2018, 3:21 am #18

Quarters are zinc-copper - not magnetic in the slightest.
It's NOT denial. I'm just very selective about the reality I accept. -- Calvin (Calvin and Hobbes)
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MarauderX
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MarauderX
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Joined: December 1st, 2011, 2:55 pm

September 14th, 2018, 2:55 am #19

I tried this a while back to get certain pieces to set where I wanted, such as tall pillar pieces that I didn't want to slide or stop tipping over.
With plaster, the magnets create a tension that crushes it down after a short time of repeated use.  You really need to use resin to add the tensile strength.  
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