Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.

High Mix Low Volume



High Mix Low Volume | 20 April, 2002

I've just got a job in a new company and my 1st assignment is to draft the High Mix Low Volume Implementation plan. Currently this company is under a massive JIT process. It is impossible to balance capacity in a non-repetitive high-mix manufacturing environment�a fundamental JIT and Demand Flow requirement. Processing time, capacity constraint considerations, allocation, and sequencing decisions are of paramount importance for reducing variability in high-mix manufacturing environments.

To success in it;s implementation, what are things that I have to consider from Manufacturing Engineering perspective other than Machine's selection, feeders availability, Automated ECO cut-in.

Experts, looking forward an input.


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Steve Townsend


High Mix Low Volume | 22 April, 2002

It's not impossible to balance in a non-repetitive situation. You'll need to investigate mix-model JIT methods. It takes more effort, but it is very possible.

First is to figure out which assemblies are going to be the most similiar, which ones use common components, common processes, common tools, etc. This way you will build the like assemblies together so as to minimize change-over. Example, build all of assemblies that use setup #1, then build all of the assemblies that use setup #2, etc.

Eliminate as much set up as you can, because in order to build to a daily rate, you could be doing a lot of change-over.

You will also want to standardize PCB panel size so that your rails (if used) won't need to be adjusted.

The trick to mix-model is standardization. Even though you're building 50 different products that have different size PCB's, if the panel size is the same, if they use the same basic components except a few exceptions, for all practical purposes your building the same thing. You'll only be changing out the paste stencil and loading different program's for the machines. Piece of cake!

Good luck

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High Mix Low Volume | 22 April, 2002

To succeed in a �non-repetitive high-mix manufacturing environment�. Humm, that sounds interesting. Guessing, it would be important to: * Control processes and process materials. * Develop outstanding process documentation. * Convert engineering documentation to machine information pretty accurately. * Protect piece parts from damage / degradation.

Actually, not that much different than the rest of us, eh?

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High Mix Low Volume | 23 April, 2002

a software tool like SMT Office from may help for this task.

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High Mix Low Volume | 23 April, 2002

Thanx guys...

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