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เนื้อหาย่อ : DRILL PRESS WORK for Machine Shop Practice Unit 1-T16 DESCRIPTION OF HOLDING DEVICES OBJECTIVES OF UNIT To describe some of the commonly used holding devices for drill press work. To explain the proper application of straps, bolts, and step blocks. INTRODUCTORY INFORMATION In order to obtain satisfactory results in drilling, reaming, countersinking, counterboring, and tapping on the drill press, the guccess of the job depends largely on the manner in which the work is held. The practice of holding work by hand on the drill press usually results in damaged work, broken drills, and often causes injury to the operator. To properly mount the work, various holding devices are. provided; such as, , the drill press vise, "v"-blocks, straps, clamps, bolts, and stops. DRILL PRESS VISE The drill press vise is the most commonly used holding device. The work is usually supported on parallel bars (or for rough work, on a wood block) to align the work parallel to the drill press table, and to prevent holes from being drilled in the vise. Drill Press Work Trade Theory Series 1. 2. FOR SMALL WORK FOR LARGE WORK FIG.I DRILL PRESS VISES Most drill press vises are constructed with a movable jaw operated by a screw. The size of the vise depends upon the size and shape of the work. (F1g. 1). Drill press vises are made in a variety of sizes and designs. 'V'- BLOCKS The "y"-block is a suitable holding device for clamping small circular pleces for drilling. A yoke or clamp fits the grooved sides of the "vli-block and has a tightening sorew to secure the work for arilling.