Elements of machine design, notes and plates, for the use of students in Lehigh university - Tapa blanda

Sinopsis

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ... with motors. taps being large and requiring an enormous pull to turn them, a long wrench is used and power applied by one or two men at the end. The tapers vary with the different builders as also do the number of threads. Twelve threads to the inch, however, is common for plugs and flanges and is almost always used for stay bolts. The reamers that are used for opening up the rivet holes are very long and only slightly tapered. The continuous flutes are interrupted by a thread-like cut which breaks the chips into short pieces, and tends to draw the reamer into the sheet. Other reamers are made where the flutes are spiral, the direction of the spiral being arranged so as to pull the reamer into the work. Fig. 130 shows a too frequent occurence in tap holes for stay bolts. T shows the tap and tx and t2 shows the inside and outside boiler plate. W is the weight of the motor. As these taps have keen edges, this weight is sufficient to make the tap cut down on the 'FigurT-ij, outside sheet and up on the inside "« "» """d c,,.,.-1 Rose reamer for sheets. sheet, thus cutt1ng away the metal at these points, so as to give a full thread here and only a half a thread on the opposite side. The remedy, of course, is to hold the motors right, but as they are heavy, workmen will.allow them to drop and the result is that some holes do not pass the inspector. The little riveting up that a stay bolt gets on the outside of the sheet does very little good in adding strength, and therefore a full thread alone should be depended upon. The joints for the steam pipe, for the dry pipe connection to the throttle, the injectors, steam valves, throttle lever stuffing box connection, etc., are now almost en Planing and milling. tirely made by ball jo...

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