calc lay variation in 2nd stranding process

        Calculates the variation of the lay-length of a strand in a second stranding process.

            
TABLE ONE shows the variation in lay-length.
            
TABLE TWO  calculates how to strand the core strand, to achieve the correct
                       lay-length of the core strand in the finished cable.


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Initial example data:
A pre-stranded cable with a lay-length of 50mm is to be stranded as core strand plus 6 additional strands or wires on a Single Twist Bunching machine, Drum Twister or similar machine without backtwist. The lay-length of this stranding process is set to 100mm. The stranding is done in same lay direction to the lay of the core strand. The varied lay-length of the core strand after second stranding is 33,33mm. If the final stranding is done in opposite lay direction, the core strand will be "opened" - the lay-length varies from 50mm to 100mm.

     INPUT:                           TABLE ONE

 lay-length of second          
stranding  process   s  :  

  mm

original lay-length of strand  s1 :  

   mm

     RESULT:

finished lay-length of core strand            
in same lay direction  s2a :  

  mm

finished lay-length of core strand            
in opposite lay direction  s2b :  

   mm

 

 

If the finishing lay-length is set to the same as of the core strand and the lay direction is opposite, the core strand will loose its twist completely (indicated in the calculation result as "no twist".

Table two calculates how to strand the core strand, to achieve the correct
lay-length of the core strand in the finished cable.

     INPUT:                              TABLE TWO

 lay-length of second          
stranding  process   s  :  

  mm

 target lay-length of core strand  s2 :  

   mm

     RESULT:

Initial lay-length of core strand            
for same lay direction  s1a :  

  mm

Initial lay-length of core strand            
for opposite lay direction  s1b :  

   mm

If both lay-length s and s2 are the same, the initial lay-length is "no twist"

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Instructions:

Select input field with mouse or TAB key.
The result is calculated when the input field is left.
Use the dot "." as decimal sign!

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