Cotton mill processes and calculations; An elementary text book for the use of textile schools and for home study

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. 1899 Excerpt: ...calculation on twist, or to quickly find out the twist on any given frame, is to find out revolutions of spindle per minute by actual count; find out revolutions of front roll by actual count; multiply this count by circumference of front roll to get inches per minute; divide revolutions of spindle by inches of yarn. The result is twist per inchT 180. The speed of a spinning frame is designated by speed of front roll. When this is given--say 100--the speed to run driving pulley is obtained by considering the front roll as the driver, and writing the formula: 100 x 112 x 90 28 x 30 This works out 1200. With a given front roll speed, the tin cylinder (and driving pulley) speed will vary with the twist gear, the larger the twist gear the slower the pulley speed necessary. Product1on. 181. Speed of front roll per minute multiplied by its circumference in inches will give theoretical production in inches. This multiplied by 60 and 11 will give the inches per day. This divided by 36 and 840 will give hanks per spindle per day. Written as a formula this would be: 100 x1x 3.1416 x 60 x 11 36 x 840 This works out 6.9 hanks per spindle per day of 11 hours, if running all the time. An allowance of 10 per cent must be made for doffing and other stops. The actual result to be expected is therefore 6.2 hanks. If spinning number 40, the pounds per spindle per day would be 6.2-=-40=.15. GENERAL DATA. 182. Spinning frames are made 36 inches or 39 inches wide, as ordered. On account of allowing longer spindle bands the 39 inch frames are considered better; but on account of saving in space, 36 inch frames have become practically universal in the South. They are usually made about 27 feet long and contain more or less spindles for that length according to the gauge. A common ...