DRAFT CALCULATIONS.
The following table may be used in calculating the required Laps per Inch on Bobbin for any given hank roving:
1 hank or below, 7.5 x square root of hank = Laps per Inch
1 hank to 2 hanks, 8.5 x square root of hank = Laps per Inch
2 hanks to 3 hanks, 9.5 x square root of hank = Laps per Inch
3 hanks to 4 hanks, 10.0 x square root of hank = Laps per Inch
4 hanks and above, 10.5 x square root of hank = Laps per Inch
Good results are obtained by using 9.3 x square root of hank.
TAPER AND TENSION CALCULATIONS.
It is difficult to give hard and fast rules for figuring the Taper and Tension Gears, as the required number of teeth on these gears is affected by the kind of stock, length of staple, amount of twist, temperature and humidity.