I recently made an instructable making plastic using glue as a binder: here
One of the comments asked about bubbles in the mix, this wasn't really a problem for me as I was spreading the mix thin but when I go again I plan to make full models with the material so I need to be sure the mix is bubble-free. The best way to achieve this is vibration and the bubbles will work themselves to the surface.
I looked at lots of ways of making theses vibrations and settled on an old hard drive I had laying about.
Step 1: Get Started
You will need:
1 Hard Drive (we will be destroying this so make sure it is spare and wiped)
1 Lin Bin
1 Piece of cover material
1 set of precision screwdrivers with torque heads
A rotary tool with assorted accessories
Assorted nuts and bolts
Step 2: Strip the Hard Drive
Remove all of the screws from the cover of the hard drive, this one had a hidden screw under the label.
Remove the driver mechanism for the read/write head, be careful with the magnets, they are strong and pinch your fingers when they come together.
It was too much work to remove the arm and it wasn't a problem anyway so I left it.
Remove the platter.
Step 3: Create the Imbalance
The whole idea of using the hard drive was that they are finely balanced, upsetting that balance makes them vibrate and quite a high frequency.
To create this imbalance, I did 2 things:
- Removed a portion of 1 edge of the platter, this trows the weight
- Replaced all the screws on the opposing side of the retention plate (these small screws are a significant weight in a balanced system like this.
I removed the material a small bit at a time with the rotary tool and kept putting it back in to test until I was happy with the vibration.
Step 4: Mount It Up
I mounted the drive on edge inside an old lin bin.
I power the hard drive off a unit from an old external hard drive, it supply power but for some reason it needs a bump from the USB on a computer to start the hard disk spinning.
I Put a plate on the top so there is somewhere to place your beaker of material to vibrate and bolted it down to hold everything in place.
Step 5: Test
The test in the video shows a bottle of water being vibrated on the table.
The video also demonstrates that I need rubber feet on the lin bin as it wants to run across the table and I need a guard bar around the top table to stop the samples vibrating off altogether.