EP 0443285 B1 19980415 - Lapping machine, and lapping plate therefor with variable groove pitch
Title (en)
Lapping machine, and lapping plate therefor with variable groove pitch
Title (de)
Läppmaschine und Läppscheibe hierfür mit einem veränderbaren Spiralrillenabstand
Title (fr)
Machine à roder, et plateau de rodage à sillon à pas variable pour une telle machine
Publication
Application
Priority
FR 9002290 A 19900223
Abstract (en)
[origin: US5131190A] A lapping machine having a lapping bed adapted to rotate about a main axis and having an annular lapping surface delimited by an inner circle and an outer circle and into which is cut a spiral groove. Virtually all of at least one confinement ring faces the annular surface and rotates about a fixed axis parallel to the main axis, contains parts to be lapped, and confines movement thereof against the lapping surface. An application disk coaxial with the ring presses the parts in the axial direction agains the lapping surface. The pitch of the groove is not constant whereby between the inner and outer circles, and excluding the inner and outer circles, there is a constant ratio between the pitch ratio lambda of the bed at a distance R from the main axis, defined by the ratio between the radial dimension of the solid part of the pitch and its overall dimension, and the angular amplitude of an arc centered on the main axis, of radius equal to the distance R, and intercepted internally by the confinement ring, whatever the distance R.
IPC 1-7
IPC 8 full level
B24B 37/26 (2012.01)
CPC (source: EP US)
B24B 37/26 (2013.01 - EP US)
Citation (examination)
WO 9014926 A1 19901213 - MOORE STEVEN C [US]
Designated contracting state (EPC)
CH DE ES FR GB IT LI
DOCDB simple family (publication)
EP 0443285 A1 19910828; EP 0443285 B1 19980415; DE 69032248 D1 19980520; DE 69032248 T2 19980813; ES 2114859 T3 19980616; FR 2658747 A1 19910830; FR 2658747 B1 19920703; JP H0557604 A 19930309; PT 96846 A 19921231; PT 96846 B 19980831; US 5131190 A 19920721
DOCDB simple family (application)
EP 90403811 A 19901231; DE 69032248 T 19901231; ES 90403811 T 19901231; FR 9002290 A 19900223; JP 2864191 A 19910222; PT 9684691 A 19910221; US 64828791 A 19910131