Routing question

I'm hoping someone can offer some insight into how manipulating routing
Queue and Move times impacts capacity regarding how Bpcs plans orders at
workcenters.
 
We recently changed the lead time days for planned items to 4 days; we
are using Bpcs 405cd.  We discovered that some of our routings total
time (Set Up, Run, Q, Move) was more than the lead time days.  This
caused the 'release date' to be later than the start date of the first
operation; from a capacity standpoint the first operation start date was
a day prior to when the system told us to open the shop order.
 
In order to have the routing time be less than or equal to 4 days I
removed 1 day worth of Move from the routing (example below).  I was
expecting the result to be that the first operation start date would be
equal to the release date-the first operation start date would move to a
day later.  This did not happen.  Of the 6 planned items that had the 1
day of Move removed, 4 planned items actually had the first operation
start date move to a day earlier, and 2 didn't change.
 
Since, I believe, Bpcs backward propagates to get operation start times,
when removing Queue or Move times, should the operation start times move
to a later date/time and not an earlier date/time?
 
Any insight into how Bpcs manages this would be greatly appreciated.
 
 
 
 
 
 
 

Marc Graff

Production Control Manager

States Industries, Inc.

(541) 688-7871 ext. 283