The following variables are considered to develop mathematical equations.
C | = | Consumption per inch |
W | = | Width of seam |
T | = | Thickness of materials |
S | = | Stitch per inch |
N | = | Stitch length in inch |
N X S | = | 1 (as 1 |
(*) | = | 2W+N assumes for cover thread |
Stitch Types | Stitch Name | Equation |
101 | Single-thread Chain Stitch | C = 3 + 2TS |
301 | Lock Stitch | C = 2 + 2TS |
401 | Two-thread Chain Stitch | C = 4 + 2TS |
406 | Cover-seaming Stitch | C = 7 + 2S(T+W) |
407 | Cover-seaming Stitch for Attaching Elastic | C = 9 + 2S(3T+W) |
504 | 3-Thread Overlock | C = 4S(W+T) + 3 |
514 | 4 Thread Mock Safety | C = 5 + 2S(3T+2W) |
516 | 5 Thread Safety Stitch | C = 2S(2W+3T) + 9 |
*602 | Cover Stitch | C = 8 + S(5W+4T) |
*605 | Cover Stitch | C = 10 + 2S(2W+3T) |
*607 | Flat Seaming Stitch | C = 12 + 4S(W+2T) |
The above equations are developed for commonly used stitch types.
Derivation of equation summary
Stitch class - 101
C = (3N + 2T)S
= 3NS + 2TS
= 3 + 2TS (N X S = 1)
Example,
Stitch class - 101
SPI (S) = 10
Stitch Length (N) = 0.10
Seam Thickness (T) = 0.05
C = 3 + 2TS
= 3 + 2*0.05*10
= 4
Stitch class - 301
C = (2N + 2T)S
= 2NS + 2TS
= 2 + 2TS (N X S = 1)
Example,
Stitch class - 101
SPI (S) = 10
Stitch Length (N) = 0.10
Seam Thickness (T) = 0.05
C = 2 + 2TS
= 2 + 2*0.05*10
= 3
Stitch class - 401
C = (4N + 2T)S
= 4NS + 2TS
= 4 + 2TS (N X S = 1)
Example,
Stitch class - 401
SPI (S) = 10
Stitch Length (N) = 0.10
Seam Thickness (T) = 0.05
C = 4 + 2TS
= 4 + 2*0.05*10
= 5
To understand the fact clearly, you have to draw the stitch geometry.
Ref.
http://www.unionspecial.com/
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Thread consumption may be carried out by an equation that is derived from stitch geometry for various stitch types. The equation is flexible and applicable to any given length of the seam, they are shown for one inch only, and may be multiplied by the length of the seam to determine the total thread consumed.
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