By Rex Miller
Grasp this present day s toolmaking gear the following, totally up-to-date to incorporate new machines and digital and electronic controls, is the last word advisor to computerized machines and toolmaking. even if you re a qualified machinist, an apprentice, or a exchange pupil, this totally illustrated quantity is helping you're employed with steel effectively, accurately, successfully utilizing at the present time s instruments and methods. It s choked with evaluation questions for college students, and loaded with solutions you wish at the activity. comprehend automatic laptop basics and paintings with jigs and furniture study the fundamentals of spiral and helix milling, apparatus slicing, and cam machining observe the way to reduce, punch, or form a die with minimal waste grasp the operations of this present day s grinders and lapping machines discover all approximately toolmaking, from allowances and tolerances to layouts and grasp plates stick with the transparent, step by step illustrations to realize a hands-on wisdom of options and techniques.
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Additional info for Audel Automated Machines and Toolmaking
For simple gearing, it is necessary only to select change gears that change the velocity ratio as follows: Velocity ratio ϭ pitch of helix lead of machine The change gears can be selected most conveniently by increasing both terms of the ratio to correspond with the number of teeth of the change gears available. When the change gears cannot be selected in this manner, compound gearing must be used. Change-Gear Train The change-speed gear train is composed of four gears as follows: • The gear on the table feed screw shaft • The first stud gear, so called because it is the first gear to be positioned • The second stud gear • The gear on the worm The gear on the worm is somewhat a misnomer, as it is not actually the gear on the worm.
For lack of a better name and because there is no change in the velocity ratio, the result is equivalent to its being placed directly on the worm shaft. The four gears in the gear train are illustrated in Figure 2-6 and Figure 2-7. The gear on the table screw shaft and the first stud gear are the driver gears; the second stud gear and the gear on the worm are the driven gears. Helix and Spiral Calculations 21 GEAR ON WORM IDLER 2nd GEAR ON STUD 1st GEAR ON STUD GEAR ON SCREW Figure 2-6 Diagram of change gearing, showing the use of the idler.
18 Chapter 2 B A Figure 2-4 Correct position of the table for cutting a helix. Turning the table to an angular position for cutting the helix prevents distortion of the shape of the cut and obtains clearance for the milling cutter. The pitch of the helix is not changed by turning the table to any angular position. Trigonometry provides a more accurate method of determining the table angle. If the pitch and circumference of the work are given, the tangent of the table angle can be found. The pitch and circumference of the work are considered as the sides of a right triangle (Figure 2-5).