FREMGANGSMAADE VED FREMSTILLING AF EN MASTER TIL FABRIKATION AF PROJEKTIONSSKAERME, EN SAADAN MASTER OG EN MEJSEL TIL UDOEVELSE AF FREMGANGSMAADEN

摘要

A method of manufacturing a master for projection screens, according to which a pattern of parallel recilinear grooves (33) and ribs (31) is formed on one side of a plate (W) of machinable material by a slotting operation performed by means of a profile chisel (9). The grooves (33) are formed in several steps, several grooves being tooled simultaneously in the various steps each in a different tooling step. The profile chisel (9) is a multiple head chisel and is composed of three subchisels, i.e. a precutting chisel (11), a cutting chisel (13) and a finishing chisel (15).