# Effective Production Ratio , Productivity, Efficienc

Six Sigma – iSixSigma Forums Old Forums General Effective Production Ratio , Productivity, Efficienc

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• #48228

Participant

Hi All,
In calculating an effective production ratio, let’s take for example there are 3 steps in the process to complete a part.  Each process has its own standard as calculated by the total time / total parts produced.
If step one has completed 100, step two has completed 40 and step three has completed 10 would the effective production ratio have to be based on the 10 items meaning we would go back and calculate teh time to produce 10 in step 1 the time to complete 10 in step 2 and the time for step 3 which is the last step.  How would we calcualte devective parts as each step cna scrap parts due to situations?
Thanks for the help.

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#161767

annon
Participant

What are you trying to ultimately accomplish?

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#161768

Participant

The ability to determine an Effective Production Ratio, Productivity and Efficiency based on completed and simi completed parts.  Is it possible?

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#161770

annon
Participant

What I hear you talking about are cycle times for three seperate subprocesses and their corresponding defect rates.
I dont know what ´Effective Production Ratio, Productivity and Efficiency´ means in this context.
I would need more information about what you are trying to accomplish for the process as a whole.  For example, are you trying to determine how to run your process more efficiently, with greater capacity, with less machine downtime, fewer defects, improved throughput rates, etc.
Good luck!

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#161771

Participant

Actually all that, but also the ability to look at a part thru all steps to get an idea of the productivity and Efficiency of the completed item thru all steps.

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#161772

Participant

I’ll try to better explain,
We want to look at the overall performace of the part.
Part A

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#161773

Participant

I’ll try to better explain,
We want to look at the overall performace of the part.
Part A

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#161774

Participant

I’ll try to better explain,
We want to look at the overall performace of the part.
Part A
Step 1

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#161778

Participant

Part A      Qty Required 100

Step 1     100 Complete  1 hour   1 parts Scrapped
Step 2       40 Complete  1 hour   0 parts Scrapped
Step 3        10 Complete .25 Hr   0 parts Scrapped

Could I measure the overall Productivity of the completed part as follows
10 items thru step 1 = .01 HRS
10 items thru step 2 = .025 HRS
10 items thru step 3 = .25 HRS
10 Items                  = .285 HRS
1 item                     = .0285 HRS per Unit
Part A Standard      =  .0250 HRS per Unit

Effective Production Ration = (10  .1) / 10   =  99
Productivity = (10 * .025) / .0258  = 96.899
Efficiency = (total items * standard for one * Eff Prod Ratio) / total time 10 parts
(10        *  .025     *  99) / .285   = 86.84%
would this be valid?

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#161786

annon
Participant

Its not an approach I would use, but that doesnt mean it is necessarily wrong.  Based on what little I know about your efforts, I would use an OEE approach, looking at determining the porportions pertaining to rate of perforance, rate of defects, and rate of uptime and then multiply through to give you a straightforward metric to work with.
Using a Roll Throughput Yield (RTY)  in this case would make sense when determining your defect rate and determining your takt time will help you determine how to prioritize and-or address the rate of performance measures.  As for rate of uptime (ie downtime), my preference is to start there – everything else being constant – my thoughts being if you arent running the equipment, then any other measure is moot.
Again, just an opinion.  There are many ways to approach these type problems.
Good luck.  I hope it was helpful in a circuitous way.

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#162685

Ed
Participant

John,
Might be mistaken..but i think you are talking about throughput, production rates, or process yield. Process yield relates input, output and defect rate in one simple formula. Simply,
Yield = (Output/Input)
where Ouput = input -defect.
Also, in cycle times you need to consider waiting time between process. The last subprocess is the bottleneck and parts coming from the second subprocess will accumulate and wait….
Just few thoughts. I hope this help….
ED

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