The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 1986
Filed:
Apr. 08, 1985
Roger K Lee, Watertown, MA (US);
Abstract
A rotary lapping system for grinding a workpiece in an abrasive slurry liquid and producing a positive lift in the abrasive slurry liquid is disclosed. The positive lift is the result of the particular mounting of the grinding pads which causes the leading edge pads to possess a positive angle of attack during rotation in the abrasive slurry liquid. The advantages of a positive lift in the grinding pads includes preventing the grinding tools from digging into the surface of the workpiece during very high speed lap grinding. Trailing edge grinding pads are allowed to produce, in one embodiment, a negative angle of attack which results in a negative lift. The net lift of all grinding pads may be a neutral lift, which allows the entire lap substrate to be tilted and allow working of local areas while the leading edge guiding pads continue to hydroplane over the workpiece surface and avoid tendencies to dig into the surface.