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ESSENTIAL FORMULAS FOR SPINNING MILL

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Technical Spinning Information and Formulas:-

 1) Constant 

One pound is 7000 grains = 453.59 grams

One skein is 120 yards = 109.7 meters

One yard = 36 inches = 0.9144 meters

One hank is 840 yards = 768.1 meters

The yarn count and hank roving number equals the number of hanks in

one pound.

To find the hank roving number from number of grains per yard:

Divide 8.33 by the number of grains per yard.

Hank roving number = 8.33 x yard

Grains

 

2) To find the speed of the front roll

Divide the revolutions per minute of the spindle by the product

of the twist per inch, multiplied by the circumference in inches

of the front roll

Front roll speed = Spindle R.P.M  diameter of front roll x T.P.I

 

3) To find the Spindle Speed

Multiply the R.P.M. of the front roll by the twist per inch and this

product by the circumference of the front roll.

Spindle speed = FRS x T.P.I x X diameter of front roller

 

4) To find the standard twist per inch

Multiply the twist multiple by the square root of the yarn count.

T.P.I. = T.M. x yarn count

 

5) To find the draft

Yarn Count (Ne) divided by hank roving equals the draft.

 

6) To find hank roving

Yarn Count (Ne) divided by draft equals hank roving.

 

7) To find the Draft

The product of the back roll gear, crown gear and diameter in

inches of the front roll, divided by the product of the front roll

gear and diameter of the back roll equals the draft constant.

Constant divided by draft gear equals draft.

Draft = Draft Constant

Draft Change Gear


8) To find the required draft gear when changing from one yarn

count to another, without changing the roving

Multiply the number of teeth in the draft gear in use by the yarn

count spun. Dividing this product by the yarn count desired will

give the required draft gear.

 

9) To find what draft gear will be required when changing from

one yarn count to another, the draft and roving both being

changed

Multiply the yarn count being spun by the new hank roving and

this product by the number of teeth in the draft gear being

used; divide this product by the yarn count desired, multiplied

by the hank roving being used. The quotient is the draft gear

required.

 

10) To find the twist per inch

Spindle speed divided by the inches of Yarn delivered per

minute of the front roll equals twist per inch.

 

11) To find inches delivered per minute

Multiply the R.P.M.'s of the front roll by the circumference in

inches of the front roll.

 

12) Spinning production calculations

Delivery:

L = n = m/min L = Delivery in m/min

T/m

Ppr = Production in practice

Production:

n = Spindle speed in min-1

Ppr = L x tex x 60 x .= g/h

1000 T/m = Twists per m

or

g/h = Gram/hour (spindle)

Ppr = L x tex x 60 x . = g/h

T/m x 1000 . = Efficiency

Note: . = 3.1416

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