From: "Herb and Carol" To: "Herb and Carol" Subject: Date: Wednesday, March 03, 2004 8:24 PM Among the odds and ends that came with my old Logan lathe is a small, double-ended friction disc clutch. The name on the little cloth bags containing extra parts for it is Rockford Clutch Division, Borg-Warner Corporation, Rockford, IL. There is a central hub, resembling a small pulley,with a 1/4" deep x 3/8" wide external, flat-bottomed groove around it's circumference. The sides of the imaginary "pulley" stand about 3/16" above the outer ends of this central piece,and are about 1/8" thick. Length of the outer shoulder is about 11/32".Diameter at the bottom of the central external groove is ~1 5/32" .Diameter of the raised sides of the "pulley" is ~1 23/32". OD of end portions is ~ 1 3/8".ID of the end portion is ~1 1/8".Bore of the center portion of this "pulley" is ~1 1/32" ID, for ~11/16" of axial length. There is a bushing,(OD ~1 1/32",ID ~9/16",x ~5/8" wide at the OD, 23/32" wide at the ID) that is a close sliding fit in the ID of the "pulley" looking affair that is the central axial part of the clutch. Both the hub and the bushing are cross-drilled at the center of each for a ~5/32"D x 1" long pin that apparently fastens both to the (missing) 9/16"D axial shaft. Now, moving from the central hub and it's bushing outward toward one end of the clutch assembly, (same on both ends of the assembly; one end mirrors the other): 3, ~7/32"D ball bearings that ride on the outside end of the bushing, and are carried by the next piece of the assembly, which has 3 half-round, radial grooves for the ball bearings on the near end, and screws into the next piece with ~7/8-32threads.This piece is ~1"OD on the inner end(the part that has the radial half round grooves); the 1" OD part is ~7-32" wide, and the 7/8-32threaded portion is ~7/32" long as well. The 9/16" bore has 3 equally spaced, axial keyways, ~1/8"wide by 1/16" deep. The ID of the next piece is threaded to recieve the previous piece, and is ~1/4"thick axially, and has 49 little teeth cut into its 1 3/8 "OD. The piece is cut tapered, in 2 steps, to where the teeth are ~ 1/16" wide at the OD, and are at the outer end of the piece. These teeth are engaged to the following piece by a strip of flat, ~1/32" thick spring steel that is bent in a half circle to match the 1 3/8" OD of the first steel clutch disc, which is ~ 3/32" thick, with 2 diametrically opposite nothches cut into its OD; these notches are ~1/8" wide and 3/16 " deep, and recieve the bent ends of the flat spring steel.This first clutch disc and all the rest of the steel discs in the series have the 3 equally spaced internal key slots. Now comes the rest of the clutch discs; 7 bronze? copper? discs with 3 equidistant, external protrusions or "ears " that are ~1/2 " long and 3/32"high; plain (no key slots), 25/32" ID, 1 1/2"OD at the base of the "ears" and have 12 graphite?-filled holes through them, and are ~ 1/16" thick; these alternate with 6 steel discs, 1 15/32" OD, 9/16"ID (with 3 key slots), x ~1/32" thick.The last disc at the outer end of the assembly is steel, ~1/8" thick with the internal key slots, and a recess in the outer end that corresponds to the base of the key slots ( recess is 11/16"in diamter), and is ~ a full 1 1/2"OD. Contained in the little cloth bags previously mentioned, are 6 of the ball bearings , 6 keys that look like Woodruff keys with a little " tongue" extending from each end to give it more reach (the "tongues" give the 5/8"long x 1/4" deep x 1/8" thick Woodruff keys a OAL of15/16") and 4 little steel pieces that represent half- circles of ~ 3/32" wide x 1/16"thick stock. 2 of these little half circle pieces fit neatly down into the recess in the outside end of the last steel clutch disc, giving it a bore of ~ 1/2" on the outside end. (I have no idea if that is where these pieces actually go.) The OAL of the entire assembly is ~ 3 5/8" - 3 3/4" with the ball bearings installed. I hope all this is clear to someone here or elsewhere on the planet who can help me ID what machine this clutch is part of! All I know for sure is that it doesn't belong in the apron my 11" Logan lathe. While I am already familar with how this general design of clutch works, I'd really like to know how this particular one works, as far " why the little teeth on the OD of the one part?", and why the double ended design the clutch? TIA for any help! Herb