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Chalkboard sphere

Chalkboard sphere
This instructable will show you how to build a blackboard sphere to write on. Because sometimes a flat area is not enought!
 
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Step 1Assemble the polysyrene sphere

Assemble the polysyrene sphere
You have to glue the two pieces together. Pay attention to use a glue intended for polystyrene (some glues can dissolve/liquify it)
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12 comments
Oct 14, 2011. 1:05 PMfreakyqwerty says:
Using glue to dissolve polystyrene is a way to make simple once-use molds, you simply carve the polystyrene use it as a mold when the model is set use the glue or even better ethyl acetate to dissove the polystyrene to release the model.
Oct 19, 2011. 8:57 PMelectfire says:
You can also use plain old acetone (sold in most box stores and hardware store to cleaning) - this is also a cool way to "melt" (Doesn't technically melt it) Styrofoam... you can then use the liquified plastic to make things with...
Oct 20, 2011. 9:29 AMelectfire says:
-oops! I forgot to add that in - Once the acetone is removed (usually just let it evaporate) It will solidify.... I wish I had heard of this method before I tried to melt Styrofoam over and open flame (a lighter)... not only did the Styrofoam not melt but in caught on fire and Styrofoam burns in an irregular way - the flame will worm it's way through the foam, all the while creating a nasty smelling smoke, which I am sure shouldn't be breathed in.
Oct 22, 2011. 10:10 AMfreakyqwerty says:
What were you trying to melt styrofoam for? Also I'm pretty sure most types of smoke is bad to breath in...
Oct 22, 2011. 4:24 PMelectfire says:
I was trying to melt Styrofoam to make it into usable plastic... as for smoke inhalation - some types of smoke smell good... like wood smoke, incense etc...
Oct 23, 2011. 9:45 AMfreakyqwerty says:
Yeah I like the smell of wood...
Oct 14, 2011. 12:36 PMzazenergy says:
this is a really fun project! what do you find yourself using this for?

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