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I wish they thought to define that number! Posted by Randy Thatcher [Email] (#22) [Profile/Gallery] (more from Randy Thatcher) on Thu, 10 Jun 2004 18:15:18 In Reply to: Interesting...assembly plant efficiency..., Clay McNeely [Profile/Gallery] , Thu, 10 Jun 2004 11:48:25 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It's pretty meaningless. If you want to smooth out line length, number of stations per line, and number of lines, I'd hope they incorporated:
Takt Time (Cycle time per station)
Number of workers
Cars per shift
Length of shift
I assume this is only final assembly. Paint shops can have their own bottlenecks, and they often don't even want assembly shops or production control to know what goes on behind those walls. It's hard to hide weld shop problems as they have lines with workcells in lockstep. One problem stops all production in paint and final assembly...
When I do line and plant efficiency there are a few ways to calculate.
Downtime
Time the line is supposed to be running during a shift
Production time in a shift (not including lunch and breaks)
OR
Actual vehicles built
Target number to build in the shift
Takt Time
Production time in a shift (not including lunch and breaks)
These formulas I use only judge building to plan, not plant to plant. They may have to add 40% more workforce to hit 99% efficiency, whereas a competitor can hit 99% with fewer workers...
Bottom line, this survey is junk if they don't reveal what the numbers actually mean.
Randy
posted by 68.125.167...
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