Recalculation of cycle time when changing man occupation or machine occupation

If you want to change the number of resources on an operation, you can do this by changing the value of the Man Occupation for Production field, or the Machine Occupation field in the Routing Operations (tirou1102m000) session, or the Production Planning (tisfc0110m000) session. If you want to avoid that the changed man occupation or machine occupation results in changed production costs, you must click Yes if LN asks the question whether to recalculate the cycle time. If you do so, LN calculates the following:

Changed machine occupation
New Cycle Time = 
(Old machine occupation / New machine occupation) * Old Cycle Time
New Man Occupation = 
(Old Man Occupation * Old Cycle Time) / New Cycle Time
Example
Quantity10
Cycle time30 minutes
Setup60 minutes
Man occupation4
Machine occupation2
Current man hours20 hours
Current machine hours12 hours

 

Change machine occupation from 2 to 3.

Result of recalculation
  • New cycle time: (2/3) * 30 = 20 minutes
  • New man occupation: (4*30)/20 = 6 men
Automatically updated
  • Resulting Man hours : 10 * 20 * 6 / 60 = 20 hours
  • Resulting Machine hours : (3 * 60) / 60 + (10 * 20 * 3)/60 = 3 + 10 = 13 hours (the added one hour is the extra hour of setup for the third machine)
Changed man occupation
New Cycle Time = 
(Old man occupation / New man occupation) * Old Cycle Time
New Machine Occupation = 
(Old Machine Occupation * Old Cycle Time) / New Cycle Time
Example
Quantity10
Cycle time30 minutes
Setup60 minutes
Man occupation1
Machine occupation1
Current man hours5 hours
Current machine hours6 hours

 

Change man occupation from 1 to 2.

Result of recalculation
  • New cycle time: (1/2) * 30 = 15 minutes
  • New machine occupation: (1*30)/15 = 2 machines
Automatically updated
  • Resulting Man hours : 10 * 15 * 2 / 60 = 5 hours
  • Resulting Machine hours : (2 * 60) / 60 + (10 * 15 * 2)/60 = 2 + 5 = 7 hours (the added one hour is the extra hour of setup for the second machine)