151 (#207) ############################################ WOOLLEN FRAME SPINNING 1 1 - I skein : 3000 x 60 2 X 36 X I X 256 9.76 lb. per spindle per hour theoretical production of i skein. Then to allow for doffing :- As (15 + •77): 77:: 9.7 : x= .474 lb. per spindle per hour actual production of i skein. Now take the 80 skeins and deal with it in the same way. Thus if each bobbin holds f of 1 lb., then I doffing of 80 skeins will take 553 minutes to spin. Now if 15 minutes be taken as the doffing time the basis of the calculation stands :- Time for spinning 80 skeins 553 mins. (T) Time for doffing 80 skeins 15.0 mins. (DT) Time for doffing I set of 80 skeins 568.0 mins. Thus the theoretical calculated production of the frame will have to be reduced as follows :: 80 skeins : 3000 x 60 18 x 36 x 80 x 256 = .0135 lb. per spindle per hour theoretical production for 80 skeins with 18 turns per i in. Then to allow for doffing As (15 + 553) : 553 :: .0135: *=. 0131 lb. per spindle per hour actual production of 80 skeins. On similar lines the calculations for 5, 10, 20 and 40 skeins have been worked out and the results plotted (Fig. 48 (b)). It will be noticed that in the last calcula- tion all three factors-skeins, twist and time for doffing ---affecting output are taken into account. Two minor factors—waste and accidental stoppage or slower running-are ignored. For the mule the calculation is based upon three draws per minute, the draw being 2 yards (72 in. from tip of spindle, “in” to tip of spindle, “out" after the slight draw-in "_jacking-up). The method of pro- 1 151
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