Jig and Fixture Design: A Treatise Covering the Principles of Jig and Fixture Design, the Important Constructional Details, and Many Different Types of Work-holding Devices Used in Interchangeable Manufacture

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Franklin Day Jones
Industrial Press, 1920 - Drilling and boring machinery - 326 pages
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Page 299 - Fig. 17. A Heavy Milling Fixture with Equalizing Clamping Device E operating the sliding plunger G. It is obvious that the work can be prevented from binding by using two equalizing plungers to throw it against the locating pins instead of a roller. Fig. 20 shows the locating mechanism for a milling fixture in which two pieces are located by two plungers each, all operated Fi{. 18. Special Type of Clamp used where Projections on the Work Prevent the use of Plain Clamps '\O
Page 69 - ... that no cutting edges come within the bushing itself. For example, bushings used simply to support the smooth surface of a boringbar or the shank of a reamer might, in some instances, be made of cast iron, but hardened steel bushings should always be used for guiding drills, reamers, taps, etc., when the cutting edges come in direct contact with the guiding surfaces. If the outside diameter of the bushing is very large, as compared with the diameter of the cutting tool, the cost of the bushing...
Page 290 - ... can be used for a variety of bushings of various lengths, the stud C being made to suit the longest piece of work. Clamps that have a tendency to draw the work down firmly onto the rest-pins or stops are useful in all classes of fixtures. Fig. 4 illustrates a simple means of accomplishing this. Care should be taken to see that the stop is pivoted above the point A. Another and more rigid device is illustrated in Fig. 5. The plunger A , carried in plunger B, is forced down against the 45-degree...
Page 79 - ... diameter than the part of the loose bushing which fits the lining bushing. This lessens the amount of surface which has to be ground, and, at the same time, makes it easier to insert the bushing, giving it, so to say, a point, which will first enter the lining bushing, and it interferes in no way with the proper qualities of the bushing as a guide for the cutting tool. In some cases, the holes in the piece to be drilled are so close to one another that it is impossible to find space for lining...

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