EAA Sport Aviation - August 2009

aluminum. Holes were drilled and tapped for the No. 6 screws for the cutter plate. Half-inch clearance holes were drilled for the cutter wheel bearing bolts. At the other end, 5/32-inch holes were drilled and tapped for the screws that hold down the bearing plate.

Cutter Plate—The cutter plate holds the cutting wheels. The cutter wheels I used are replacement parts for tubing cutters. I bought mine at Princess Auto (part number 8045215).

The blades of the cutting wheels should be 3/8 inch above the base plate, which I accomplished through the use of 3/16-inch aluminum and an AN960-10 washer. The cutter plate should be cut with an arc slightly larger than the filter to provide clearance for the oil filter can. The 5/32-inch holes for the cutter wheel bolts were drilled and tapped for AN3 bolts. Also, clearance holes were drilled for the No. 6 hold-down screws. The cutter bearing bolts were jammed with AN365-10 nuts and hold the tolerance for easy turning of the cutters. A 1/2- inch hole in the base plate provides clearance for the jam nuts. Half-inch high-density plastic was used for the bearing ( 3 inch by 1 inch) and pressure plates ( 3 inch by 1-1/2 inch).

Bearing Plate—The bearing plate houses the threaded rod that provides the pressure on the filter. A 13/64- inch hole through the bearing plate, threaded for 1/4 inch by 20 inches, captures the threaded rod. Two 3/16- inch holes were drilled for screws that anchor the bearing plate to the base plate. A purchased handle (Lee Valley 00M55.10) with a jam nut was attached to the other end of the threaded rod.

Pressure Plate—The pressure plate puts pressure on the filter, which in turn contacts the cutting wheels. A 1/2-inch deep by 1/4-inch hole in the pressure plate receives the threaded rod and provides pressure on the filter can. An arc should be cut into the pressure plate to match the 2-5/8-inch outside diameter of the filter.

To use the cutter, simply place the filter into the recess and snug up the

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