[Illustration]

The above figures are for Total Draft up to and including the 3-in. dia. Calender Rolls. When Graduated Pitch Metallic Rolls are used, and it is desired to figure drafts between them, the following equivalents are approximately correct:

1-3/8-in. dia. Roll, 32 pitch, taken as 11/6-in. or 1.83-in. dia.
1-1/4-in. dia. Roll, 32 pitch, taken as 10/6-in. or 1.67-in. dia.
1-1/8-in. dia. Roll, 32 pitch, taken as 9/6-in. or 1.50-in. dia.
1-in. dia. Roll, 32 pitch, taken as 8/6-in. or 1.33-in. dia.
1-1/8-in. dia. Roll, 16 pitch, taken as 10/6-in. or 1. 67-in. dia.
1-in dia. Roll, 16 pitch, taken as 9/6-in. or 1.50-in. dia.{95}

PRODUCTION CALCULATIONS

[Illustration]

The greater production with Metallic Rolls over Common Rolls for a given number of revs. is due to the meshing of the flutes, which increases the effective circum. of the rolls about 33 per cent. This accounts for the difference in the gears driving the Calender Rolls.

Short rules for production in 10 hours based on 20 per cent. allowance for stops, etc., and 1-3/8 in. dia. front bottom roll.

Common Rolls—.852 x R. P. M. of Front Roll x Wt. of Sliver in grains = Lbs. in 10 hours.

Metallic Rolls—1.126 x R. P. M. of Front Roll x Wt. of Sliver in grains = Lbs. in 10 hours.{96}

DRAWING FRAMES.