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Drilling Operation and Methods

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ting Cut Tool ions icat ppl A By Geor ge S r, Jr. C chneide MfgE Cutting Tool Applications Upcoming Chapters Metal Removal Cutting-Tool Materials Metal Removal Methods Machinability of Metals Single Point Machining Turning Tools and Operations Turning Methods and Machines Grooving and Threading Shaping and Planing Hole Making Processes Drills and Drilling Operations Drilling Methods and Machines Boring Operations and Machines Reaming and Tapping Multi Point Machining Milling Cutters and Operations Milling Methods and Machines Broaches and Broaching Saws and Sawing Abrasive Processes Grinding Wheels and Operations Grinding Methods and Machines Lapping and Honing Chapter 9 Drilling Methods & Machines 9.1 Introduction One of the …show more content…

The V-belt from the motor drives a pulley in the front part of the head, which in turn drives the spindle. The spindle turns the drill. Two head assemblies are shown in Figure 9.2 b and c. Speeds on a stepped V pulley drive are changed by changing the position of the V-belt (Fig. 9.2b) Speeds on a variablespeed drive mechanism are changed by a hand wheel on the head. (Fig. 9.2c) The spindle must be revolving when this is done. Quill assembly: The spindle rotates within the Quill (Fig. 9.5) on bearings. www.toolingandproduction.com Chap. 9: Drilling Methods & Machines the spindle to the inner face of the column • The maximum length of quill travel • The size of the Morse taper in the spindle • The horsepower of the motor. 9.4 Drilling Systems Drilling systems are usually automated and computer controlled. Speeds, feeds, and depth of cut are often FIGURE 9.7: Gang drilling machines permit pre-set. Such systems economical ways to perform several different combine drilling opera- operations. (Courtesy Clausing Industries, Inc.) tions with reaming, tapping, countersinking, etc. Figure 9.6 shows a 3-axis 9.4.2 Gang Drilling CNC drilling machine. An economical way to perform several FIGURE 9.4: Radial drills are used to machine large castdifferent operations on one piece is by ings, weldments or forgings. (Courtesy Summit Machine 9.4.1 Multi Spindle gang drilling as shown in Figure 9.7. Tool

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