The book Drill Jigs was written by author Edward Russell Markham Here you can read free online of Drill Jigs book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Drill Jigs a good or bad book?
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33, to which a bracket, F, was fastened to carry the bushing, B. , This bushing is fastened by a screw and can readily be removed and others inserted, having various sizes of holes, if found desirable. These preparations were all that were necessary with the exception of the gages that will be described in the operation of the method for spacing, which is as follows: The plate to be drilled had a number of holes spaced as shown in Fig. 34, and before drilling them they were marked as Nos. 1, 2,... 3, etc. , No. 1, as will be seen, being the upper left-hand hole. Its loca- tion with reference to either end or sides of the plates did not require to be very exact; but other plates may need to have holes placed at some definite distance from the edges or ends, so it may be assumed that the distance is 6 inches from the edge, G, and 8 inches from the end, H. With these distances given, make two gages, using vernier or micrometer calipers for standard, and make them 6% and 8% inches long, respectively.
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