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Chapter 8. Liquid Len Meets DiscoHead: > Driving the Liquid - Pg. 262

Liquid Len Meets DiscoHead course, that your slide is slightly less than ¼" thick, as mine was, and the wheels you're using are the fairly typical ½" diameter x ¼" thick). Drill out to 5 / 64 " the centers of the toy car wheels that you're using as pulleys, so that the wheels spin freely on the axles, then assemble the drive train elements on the rear chassis component, cutting the axles to length as you go. The axles should extend into the front chassis plate at least ¼". Remember: Measure twice, cut once. You can add the front chassis plate after you've fine-tuned the drive train. Power up the motor and experiment with rubber bands in different widths and thicknesses as drive belts. I ended up using these kinda silicony bands sold as hair-restraint accessories, but I'm always scoping out new possibilities whenever I come across variations on a rubber- band theme during sourcing. You'll know when you have the right belts, because the drive will run smoothly with minimum noise, and the liquid slide will have a slow, steady rotation. There are lots of plans out there for "workbench power sup- plies" that are useful as hell for supplying juice to works-in- Figure 08.61: And it looked like this, by the time I finished fabrication.