MINIATURE THICKNESS SANDER
THIS MACHINE IS SHOWN WITHOUT THE GUARDS IN PLACE. IF YOU BUILD ONE OF THESE FOR YOURSELF, GIVE CAREFUL ATTENTION TO SHROUDING THE PULLEYS, BELT, AND DRUM.
B & D electric lawnmower motor, a shop-built drum, and an adjustable ramp. The switch is a heavy-duty dimmer, and is necessary to help control the sanding speed.
The lawn-mower motor is mounted on a plywood angle, and it's speed is reduced considerably by notched belting. Do not hook one of these motor up in direct drive, because their unloaded speed is ridiculously high.
The hand crank feeds through a brass insert, and moves the wedge table minutely. Using the dial indicator as a guide, a one-thousandth of an inch wedge travel is easy to achieve.
The angled table is covered with friction-fighting plastic laminate.
Another view of the belt and pulley arrangement. The owner-operator should install appropriate guards; a good dust-collecting shroud over the drum will go a long way toward hiding the moving parts.
The outboard pillow block is off to reveal the stacked plywood drum. The axle was sandwiched between two v-notched ply sheets, and locked with a pin through a cross-drilled hole in the axle. Ply is further stacked up to achieve the diameter desired. If no lathe is available, the drum can be roughly rounded on a drill press. A flat board covered with abrasive paper will true the drum to the angled table.
The wood has entered from the top and is being pulled DOWN, against the drum rotation. Never stand in line with the high side of the ramp.
The wood has entered from the lower edge of the picture, on the high side of the ramp, and will be caught and pulled through from the upper side of the picture. ALWAYS TAKE LIGHT CUTS, AND NEVER RUSH OR HESITATE WHEN FEEDING THE WORK.
The drum is covered with 80-grit self adhesive abrasive. Do not overspeed the drum or operate the sander without a cover over the drum - centrifugal force can throw off the paper.