Step 4: Parts
If you would like a complete kit with case, please check out our Ultimate Useless Machine Kit as show in the photos above.
Gear-Motor (no modding needed)
Printed Circuit Board making soldering very quick and easy.
Laser-Cut acrylic actuator (Finger) back-lit with LEDs
laser-cut acrylic case & hardware
Switches, LEDs, wire and heat shrink
The kit is a big improvement over any of our competitor's machines. They don't supply a printed circuit board or the nifty acrylic finger that's back-lit with red & green LEDs.
All the acrylic parts are laser-cut at our shop using a Epilog laser!
We also sell just a Parts Only Kit for those who wish to make their own case.
Frivolous Engineering buys parts from Newark/Element 14 & you should too!
Here's the parts you need to build the original Useless Machine:
Battery Holder 2-AA Cells (Note: 3 AA's or even 4 AA's will work, faster, maybe too fast )
DPDT Toggle Switch
SPDT Micro-Switch (Just about any with 3 pins and a lever should work.)
RC Servo you can mod
The servo I modded is a JR Sport ST47. It's a standard size servo with a torque of 55.0 oz-in.
Stay away from any of the micro-sized servo’s. A standard size servo with at least 4-5Kg/Cm torque will work in most cases. Keep in mind that the toggle switch and arm length are some of the things that will determine how strong a servo you’ll need. Most of the standard servos should do the job.
mrrigsby reports that a toggle switch from Radio Shack, catalog # 275-636 works.
He also pointed out that it's better to use "4 fresh alkaline batteries--with 4 rechargeables, I couldn't depend on having enough power to always throw the switch."