60T

The PR Hoffman 60T is an insert carrier and lapping carrier type. The PR Hoffman 60T is used with double-sided planetary lapping and polishing machines. The PR Hoffman 60T carrier type is mapped to the 3600 PR Hoffman machine designation.^[1][3][2]

Insert carriers and lapping carriers are consumable or semi consumable workholding parts used in double sided planetary lapping and polishing. A carrier holds multiple workpieces in openings while the planetary drive moves the carrier between opposed plates so both faces of the workpieces are processed at the same time. Carrier geometry helps control part separation, motion, and exposure to the abrasive interface during the cycle.

Double sided lapping and polishing carriers sit inside a substrate finishing flow rather than acting as standalone processing tools. Such carriers are used during thickness reduction, flatness correction, and surface generation steps for discs, wafers, and other flat parts, and the parts then move onward to cleaning, inspection, and in some cases finer polishing or downstream device fabrication.

Carriers of this class are used to hold round or shaped parts during double sided lapping or polishing when both faces must be processed together. Typical applications include semiconductor wafers, optics blanks, ceramics, and other hard brittle materials that require controlled parallelism and thickness uniformity.