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Braid and Spiral Shield

         
 Braid Shield Algorithm Procedure
1. Covert desired % coverage into an F value by:
 
bFormula 1.gif
2. a) *Select an angle you'd like to be close to, and calculate N: bFormula 2a.jpg
b) Round N up (lowers angle) or down (raises angle) to an integer value. Recalculate a bFormula 2b.jpg
3. a) Using a from step 2B, calculate P bFormula 3a.jpg
b) Round up Picks to next increment available.
Use new P to Recalculate a by:
bFormula 3b.jpg
4. Recalculate F by: bFormula 4.jpg
5. Recalculated % by: bFormula 5.jpg
6. Calculate weight by: Formula 6.jpg

             
 Spiral Shield Algorithm Procedure
1. Convert desired minimum % coverage into an F value by:
 
sFormula 1.jpg
2. a) *Select an angle that you would like to be close to, calculate by: sFormula 2a.jpg
b) Now recalculate a using N from step 2a by: sFormula 2b.jpg
3. a) Using new a from step 2b, estimate P by: sFormula 3a.jpg
b) Round Pick value from 3a up to next available pick increment for the carriers you used in step 2a. Now recalculate a by: sFormula 3b.jpg
4. a) Re-calculate F by: sFormula 4a.jpg
b) Coverage is: sFormula 4b.jpg
5. Calculate actual weight/M' of shield by: sFormula 5.jpg
 
Variable
Definition
%  Percent coverage
N  Number of Strands (intergers from 1-13)
P  Picks per inch
d  Diameter of strand (inches)
a  Angle of shield to axis of cable (degrees)
D  Diameter under shield (inches)
C  # of carriers (typically 4, 8, 12, 16, 24, 48)
p  Pi (3.14159)
w  Weight of strand, per M' (lbs/M')
W  Weight of shield per M' (lbs/M')
*Note;Recommended angle range:
 - For D .020in. - .380in., use 20 degrees to 40 degrees.
 - For D larger than .380in., use 40 degrees to 80 degrees


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