Patent ID: 7055243

Claim:
A method of forming a crankshaft damper comprising: forming a first ring by spinning a first annular disc supported in a rotating mandrel, moving a first roller radially inwardly against a side of the first disc displacing a portion of the first disc inwardly against a mandrel to form a hub, pressing a second roller radially inwardly against a first annular disc edge whereby a gathered portion of the first annular disc is formed, splitting the gathered portion by inward radial movement of a roller while simultaneously forming a lobe from the gathered portion, stretching the lobe in a radial direction by outward radial movement of a second roller while simultaneously supporting a portion of the gathered portion, thereby simultaneously forming a radially extending member substantially normal to an axis of rotation of the first ring; forming a plurality of tabs extending about a perimeter of the radially extending member; forming a second ring by spinning a second annular disc supported in a rotating mandrel, moving a first roller radially inwardly against a second annular disc edge whereby a gathered portion of the second annular disc is formed, pressing a roller having a profile against the gathered material whereby a profile is formed in a second ring outer surface; and connecting the first ring to the second ring by engaging a flexible connecting member between the first ring and the second ring.