MAKE: PROJECTS Eccentric Cubicle Figure 09.42: Skeletal Bellows Assembly (not an Icelandic avant-noise ensemble) Figure 09.43: I could make some kinda lame joke here about "upside-down cakes," what with it being a cake pan, and it being upside down and all, but really, what's the point? Working from the bottom of the bellows modules up, I laid out the guideposts to give ½" of clearance around the dryer ducting. For the base, I started with a 12" diameter disk of ¾" plywood, and used a ¾" Forstner bit to drill 5 / 8 " deep mount- ing holes for the guideposts. [Figure 09.42] The disk was sized to fit into the cake pan, which would be mounted upside-down on the turntable platter. [Figure 09.43] The pan's removable bottom panel became the top cladding for the disk once the appropriate holes had been positioned and drilled, with wooden spacers supporting the plywood at the correct height above the platter. The entire subassembly is held together by a single ¼-20 bolt running through the center of the turntable platter, with the sides of the cake pan being removable simply by releasing the sprin- glock and sliding it upwards. As the bellows outlet point is via the underside of the wooden mounting disk, having this kind of easy access is a pretty useful feature. With the basic framework of the bellows roughed in, I cut and assembled four identical flap valves from craft foam and inner-tube rubber, using cyanoacrylate to bond the two layers together. [Figure 09.44] I'd initially formed the flap with a single cut line, then real- ized after an initial field test that more material needed to be removed from around the flap to let it seat and unseat with- out binding. Once I'd made that modification, they worked like a charm. [Figure 09.45] 274