This listing is for a vintage and original technical bulletin, 'Style E Universal Chaser Grinding Fixture: Longer Lasting Chasers,' identified as Bulletin E-3, published by Jeffery-Gilles Co. Machine Tools. This detailed booklet from the 1940s illustrates and describes the operation of The Geometric Tool Company's Style E Universal Chaser Grinding Fixture, an essential tool for sharpening chasers used in threading operations. The bulletin includes diagrams, instructions for grinding various types of chasers (chamfering milled, collapsing, cutting face), and tables for determining minor diameter of thread and chaser holders. It is a valuable piece for collectors of vintage machine tool literature, machinists, or anyone interested in industrial history and precision manufacturing.
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