246 (#320) ############################################ WOOLLEN AND WORSTED SPINNING a 381•0 Draft (6-5) -50 the change wheel required to give a draft of 6-5. From Fig. 69 the Twist Calculation will be readily worked out, and here also complete control must be attained. The most see-able" method to adopt here is to start from the revolutions per minute of the main shaft and from this obtain (a) The revolutions per minute of the spindles (or flyers), and (6) The inches delivered per minute by the front rollers. Then it will be evident that ő = the turns per inch in the yarn (theoretical). This calculation stands as follows- 1250 x 53 x 10 = 2290 revs. per min. of spindle. .24 Xit 1250 x 53 x 6 x 34 x 4 x at 184 inches of yarn per 24 X 15 X 268 min. delivered by F.R.'s. 2290 = 12.4 turns per inch (theoretical). 184 But it will be noted in this calculation that the numbers 1250, 51 and 24 come in both fractions, and cancel one another. Thus the more direct method is the following, based upon one revolution of the cylinder shaft. 10" - 8 turns of the spindle. it 6 X 34 X 4 X * •63 inches of yarn delivered. 15 X 268 8 .65 12'4 turne per inch (theoretical). 246
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