Machinery's Handbook, 31st Edition
732
V-Blocks V-Blocks
The V-block is a precision holding jig or fixture devised as a tool or to enable the preci sion and repeatable positioning of a cylindrical work piece. The V-block enables drilling, grinding, or milling operations on a robust and precision platform as compared to the vise or other simple holding devices. In 1902, Elmer Cobb and Eugene Spaulding of Portland, Maine patented a Machinists V-block to expand their capability to hold and drill extended workpieces. The V-blocks were machined with a large channel on one side and a pair of smaller channels on the other to accommodate the various diameters that were encountered in the basic work done in the machine shop of the era. Each block had a hole in the center to allow the passage of a drill through the work piece. The blocks were a matched set that were secured together by two rods that aligned the blocks together and allowed them to slide open or to be closed together to support work of varying lengths.
Fig. 1. Machinists’V-Block, Patented 1902 by Cobb and Spaulding In 1923, Gustave Hines invented a device that incorporated a scale along the linear side of the work piece, and locked the work into a scaled collar that could be rotated accurately throughout 180°. The device provided a drill guide that would accurately measure dis tances between centerlines of holes, and provide rotational accuracy.
Gustave Hines 1923 Innovation
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