Introduction: Chalkboard Sphere

Picture of Chalkboard Sphere

This instructable will show you how to build a blackboard sphere to write on. Because sometimes a flat area is not enought!

Step 1: Assemble the Polysyrene Sphere

Picture of 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)

Step 2: Add 2 Layer of Cementite (primer)

Picture of Add 2 Layer of Cementite (primer)

To make it, I covered a polystyrene sphere with special blackboard painting. I used a cd-r box to hold the sphere in place

Step 3: Add 1 or 2 Layers of Blackboard Paint

Picture of Add 1 or 2 Layers of Blackboard Paint

Once dry, you can add a layer or two of blackboard paint

Step 4: Add a Support to the Sphere

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Use an empty cd box as a stand for the sphere. With a cutter make a small hole and glue the cd-box stick into the hole. I used an hot-glue gun to fill the spaces between the stick and the hole in the sphere

Comments

freakyqwerty (author)2011-10-14

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.

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...

derte84 (author)BrefelanDesigns2011-10-20

Will it solidify later?

BrefelanDesigns (author)derte842011-10-20

-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.

What were you trying to melt styrofoam for? Also I'm pretty sure most types of smoke is bad to breath in...

derte84 (author)freakyqwerty2011-10-26

for casting maybe..

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...

Yeah I like the smell of wood...

derte84 (author)BrefelanDesigns2011-10-22

0_0 ... I'll try definitely with acetone

derte84 (author)freakyqwerty2011-10-14

Worth a try!

zazenergy (author)2011-10-14

this is a really fun project! what do you find yourself using this for?

derte84 (author)zazenergy2011-10-14

conceptual maps :)

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