In this Instructable I will be showing you how to make a rotational casting machine using ordinary items. What you decide to do with the machine after you are done is completely up to you. I will not be held responsible for any inadvertent pregnancies, rodent infestations, snow storms, or sightings of James Dean.

I can tell you that my plan is to use the machine to create hollow casts using urethane molds.

I tried to make the directions as obvious as possible, but clearly my day job is not as an assembly instruction director, so please email me (pseudoreid@gmail.com) if you have any questions that arise during this Instructable. I heavily stress relying on the schematic as your guide.

Step 1: The Supplies & Schematic

The totally cost of supplies will be $150 give or take. The most expensive parts are the chain rings ($20 a piece) and the gear chain (about $20).

The schematic I created for the roto cast shows you where things are going to go, but doesn't get into the details. Most importantly, it shows you where the secure and loose joints are going to be.

Here is what you will need.

Strong power drill
Full set of high quality drill bits
Pliers or Leatherman
Glue gun (w/glue)
Metal/Plastic epoxy (2,500 pounds per square inch strength)
Staple gun
Bicycle gear cutter tool
Hack Saw
Wood Saw

2x 20 inch 2x4
1x 25 inch - 2x4
4x 5 inch - 2x4
2x 18 inch - 1x1
2x 16 inch - 1x1
2x 14 inch- 1x1
2x 12 inch- 1x1

Threaded Rod:
2x 4.0 inch - 5/16 inch rod
1x 4.5 inch - 5/16 inch rod
1x 8.5 inch - 5/16 inch rod
1x 3.5 inch - 5/16 inch rod
3x 4.0 inch - 3/8 inch rod
1x 6.0 inch- 3/8 inch rod
1x 12 inch - 3/8 inch rod
1x 3.0 inch - 3/8 inch rod

10x 5/16 inch stop nut
13x 5/16 inch nut
5x 3/8 inch stop nut
5x 3/8 inch nut
Box of 4 inch wood screws
8x 3/8 inch washers (probably will have extra)
8x 5/16 inch washers (probably will have extra)
4x 3.5 inch 22 teeth bicycle chain rings with 4 pre-existing mounting holes, NOT 5
2x 1/8 inch t pipe connector - to support the rotation axle
2x 1/8 inch elbow pipe connectors - to use for the crank
12x L flat brackets used to strengthen joints for frames
3x 3.0 inch flat metal plate with 4 holes in it - this comes in packages of 4, and would normally be used to secure to pieces of wood together. These plates should be able to bolt into the chain ring holes. You will have to drill a whole in the center of the plate though, as there is no existing one there.
14x14 inch piece of mesh

<p>I made this a couple of weeks ago, and tinkered around as I made some errors. I put another 3.0 inch flat metal plate with 4 holes in the bicycle chain ring at the top by the winder. My moving frame had some movement that caused the chain to come off.</p><p>I did get it moving smoothly but I am getting odd sections of pooling in my casts, and thin to no coverage in some spots. I wonder if I am spinning too fast? I have continued spinning past the curing time of 12 minutes, so I am certain I am not stopping too soon. </p><p>Thanks very much for the plans! </p>
<p>So, I think the issue with mine is the SmoothOn slush casting material kicks off too fast and pools in one spot, but I did get better coverage by rotating 10 turns one way, and 10 turns in the opposite direction for the duration of the cure. </p>
<p>my only question would be ; how well can i get smaller details cast this way? im starting to get into 1/4&quot; scale modelling and some of the details are pretty small .. like rivets..window trim and such..how well does this process allow them to show?</p>
<p>not sure how big your models are but if you want intricate details you might be able to pressure cast the resin.</p><p>Good instruct able here https://www.instructables.com/id/Bubble-Free-Resin-Casts-with-Modified-Paint-Tank/</p>
<p>very very clever.....i like</p>
<p>Nicely done!</p>
<p>Check out this professional version that has motor</p><p><a href="https://www.kickstarter.com/projects/rotomaak/rotomaak-desktop-rotational-casting-machine" rel="nofollow">https://www.kickstarter.com/projects/rotomaak/roto...</a></p>
Woot woot! I am now in awe of you!!!! Looking at $$$$ machines, now I am going to follow your foot steps. Thinking metal instead of wood, though. Keep rockin' it DIY style homie!
This is my first introduction to rotocasting. Can you tell us more about the process? It looks like you are just turning the mold over and over so the casting material just coats the inside. Is there more to it that that?
And that just kind nailed the whole point of rotocasting. In that it is used to make hollow positive of the mold......
It sounds like you were chewing on your vodka infused bacon while you shot the video.
I&quot;ll be updating this Instructable, as I got a lot of good feedback from Maker Faire...stay tuned <br />
waiting.... patiently... for the updates :)
Hey I was just wondering what are the sizes and weights of the molds you have put on the machine? I work with life sized heads a lot, and would like to start using some materials that require a rotational machine. Any information you could give would be a great help. Thanks. M
i found that when i made one of these that i needed one of the sprockets to have more teeth, giving the central frame more varied rotations and giving a better, more uniformally hollow cast overall. would you in retrospect make any alterations to your design?
The cast rhino head looks great, proof your instructable works! How about another on mixing & coloring resin before the pour?
Was that some Crystal Castles playing in the background the song is Crimewave im a huge fan of them
Holy Crap, its the Reider in the hizzouse!
Interesting idea having one sprocket directly driving another. How are these components wearing?
@Geordiepom Sprockets are wearing well so far. The only addition that I might make is a counterweight, as when the mechanism is turned, it has a tendency to speed up during certain parts of the revolution due to the imbalance.
@spike shadows Thanks for the concern. If you go to step 7, you can watch a video where I actually have a mold mounted in the machine. Basically, I duct taped it to the mesh on the small frame. You could strap it in using some other method, but duct tape is quick and easy.
can you show where to mount the molds? I can't really see it anywhere in here

About This Instructable




Bio: Just a SF local tinkerer, entrepreneur, and artist.
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