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A Manual of Engineering Drawing for Students and Draftsmen (Paperback) Loot Price: R376
Discovery Miles 3 760
A Manual of Engineering Drawing for Students and Draftsmen (Paperback): Thomas Ewing French

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A Manual of Engineering Drawing for Students and Draftsmen (Paperback)

Thomas Ewing French

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Loot Price R376 Discovery Miles 3 760

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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. 1918 Excerpt: ...angle less than 90) it will generate a cone and the curve made by the moving point will be a "conical helix." When the angle becomes 90 degrees the helix degenerates into a spiral. To Draw the Projection of a Helix.--Fig. 305. Divide the circle of the end view of the cylinder into a number of equal parts, Fio. 305.--The helix and its development. and the lead into the same number. As the point moves around through one division it will advance a proportional distance of the lead; when half way around the cylinder it will have advanced one-half the lead. Thus the curve may be found by projecting the elements represented by divisions of the circle to intersect lines drawn through corresponding divisions of the lead. If the cylinder be developed the helix will appear on it as a straight line inclined at an angle whose tangent is v The conical helix ITU is drawn similarly, the lead being measured along the axis. Screw Threads.--Threads are always understood to be single and right hand unless otherwise specified. A single thread has one thread of whatever section cut on the cylinder. When it is desired to give a more rapid advance without using a coarser thread two or more threads are cut side by side, giving double, triple, etc., threads, as illustrated in Fig. 306. A right-hand thread advances away from the body when turned clockwise. A left-hand thread is always marked plainly "L.H." and may be recognized also by the direction of the slant. The pitch of a thread is the distance from center to center of consecutive threads. The lead has already been defined as the distance advanced in one revolution. In a single thread therefore the pitch and lead are equal, in a double thread the lead is twice the pitch, similarly for other multiple threads...


Imprint: Rarebooksclub.com
Country of origin: United States
Release date: May 2012
First published: May 2012
Authors: Thomas Ewing French
Dimensions: 246 x 189 x 4mm (L x W x T)
Format: Paperback - Trade
Pages: 66
ISBN-13: 978-1-152-40021-4
Categories: Books
LSN: 1-152-40021-5
Barcode: 9781152400214

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