# Machinery's Handbook Volume 1916

• Paperback
By (author)

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## Description

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...crank equals 9 degrees, two holes in the 18-hole circle, or 3 holes in the 27-hole circle, must correspond to one degree. The first principle or rule for indexing for angles is therefore that two holes in the 18-hole circle or 3 holes in the 27-hole circle equals a movement of one degree of the index head spindle and the work. Assume that an indexing movement of 35 degrees is required. One complete turn of the index crank equals 9 degrees; therefore, first divide the number of degrees for which to index, by 9, in order to find how many complete turns the index crank should make. The number of degrees left to turn after having completed the full turns are indexed by taking two holes in the 18-hole circle for each degree. In this case, --= 3%, which indicates that the index crank must be turned three 9 full revolutions, and then 8 degrees more are indexed by moving 16 holes in the 18-hole circle. To index for degrees, for example, first turn the index crank one revolution, this being a 9-degree movement. Then to index 2V2 degrees, move the index crank S holes in the 18-hole circle (4 holes for the two whole degrees and one hole for the H degree equals the total movement of 5 holes). Below is shown how this calculation may be carried out to plainly indicate the movement required for this angle: 11% deg. = 9 deg. + 2 deg. + % deg. 1 turn + 4 holes + 1 hole in the 18-hole drcle. Should it be required to index only Vk degree, this may be done by using the 27hole circle. In this circle a three-hole movement equals one degree, and a one-hole movement in that circle thus equals V degree, or 20 minutes. Assume that it is required to index the work through an angle of 48 degrees 40 minutes. Below is plainly shown how this calculation may be..

## Product details

• Paperback | 286 pages
• 189 x 246 x 15mm | 513g
• United States
• English
• black & white illustrations
• 1236963539
• 9781236963536