Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1975-01-31
1976-03-02
Whitehead, Harold D.
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
B24B 1900
Patent
active
039408884
ABSTRACT:
A gemstone faceting machine for properly orienting a gemstone for forming facets thereon in a plurality of coaxial rows with equal spacing of the facets in the rows. A dop stick is provided on the end of a faceting shaft secured in a quill sleeve rotatably mounted in a faceting head (which can be angularly adjusted for different facet rows to be formed). A spring-biased detent trigger is pivoted on the bracket to engage between the teeth of an indexing gear secured on a collar on the quill sleeve near the other end of the shaft. A positioning pin is secured to the collar and projects through the gear. A guide disc having evenly spaced peripheral notches is engaged around and can be rotated on a flanged bushing threadably engaged on the quill sleeve adjacent the gear, and a coil spring is provided on the bushing, urging the disc toward the gear. The disc has respective holes spaced to receive the pin to establish the angular relationship between the successive rows of evenly spaced facets. The notches on the disc guide the detent trigger into engagement between the gear teeth for assuring uniform angular rotational steps of the shaft in forming the facets of a particular row.
REFERENCES:
patent: 2452089 (1948-10-01), Wiken
patent: 3688452 (1972-09-01), Stevens
patent: 3818041 (1974-06-01), Long
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