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Chapter 10. Hammerhead Live: > The Pin Drum - Pg. 317

MAKE: PROJECTS Eccentric Cubicle Figure 10.03: 20 bucks worth of sorely abused 4" ID copper pipe (#2 copper, for those of you practicing your scrap-fu). Figure 10.04: Just about halfway through the arduous task of cutting to length: 2 hours, 3 hacksaw blades, 4 quarts of perspiration, 5 dozen new cuss words. 1 usable pin drum blank. Figure 10.05: Endplugs in place, axle threaded . . . this is how it rolls. The Pin Drum The sample pictured is what I started with after half an hour with steel wool and kitchen cleanser. It cost me $20 Cdn, which speaks volumes about the current state of the world copper market. [Figure 10.03] Cut the copper pipe to 8½". This will form the pin drum, which will hold the program events for the sequencer. 5 5 "Program events" . . . yeah, right. What's gonna happen is you'll be drilling and threading 112 holes in the damned thing, into which you'll thread ½" ¼-20 machine screws to trigger the hammers. The further out they extend, the more the hammer travels, and the louder the noise is when the hammer falls. Cunning, no? The cuts need to be absolutely square. Lacking a pipe cutter with a 4"+ throat, I armstronged the cuts with a hacksaw and trued up the angles with a file and emery cloth on my dead-flat surface. It took about two freakin' hours. [Figure 10.04] Plug both ends of the pipe with plywood disks. A 4" hole saw is a damned fine investment, giving accurately formed circles with a precise center hole. The center hole is useful for the next step, which is threading 12" of ¼-20 threaded rod through the plugs and pipe to serve as an axle. [Figure 10.05] Make two pillow blocks to mount the pipe axle on. Hard- wood is the preferred material. Yes, you'll need two more rollerblade wheel bearing races and bushings. Size the 306