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How SMT Line Change over is measured?

How SMT Line Change over is measured?

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how do you measure the overall change over time of an smt li... - Feb 03, 2013 by gwego

Changeover starts when the last board from the work order go... - Feb 04, 2013 by Sr. Tech

Agreed, and stops when the first completed PCB of the next r... - Feb 04, 2013 by A Very Frazzled Man

Thanks a lot. btw, is there a standard for this measure or t... - Feb 04, 2013 by gwego

anybody can share if there are publications/whitepaper relat... - Feb 10, 2013 by gwego

If you stop when the first completed PCB of the next run goe... - Feb 20, 2013 by dyoungquist

Actually, we calculate it BOTH ways, and track each of the t... - Feb 20, 2013 by A Very Frazzled Man

Hi Frazzled Man,did you mean this way? end - 1st piece of... - Feb 22, 2013 by gwego

We've had a lot of turnover with our operators, so currently... - Feb 22, 2013 by A Very Frazzled Man

Do you also measure job run time? IF you don't I"m sure if ... - Feb 26, 2013 by Stephen

Stephen, Changeover is the time we are not running the li... - Feb 26, 2013 by Evtimov

Hello, We measure changeover time from when the last CCA... - Feb 26, 2013 by Anton99

Yes but if you start measuring it from last board into the o... - Feb 26, 2013 by Stephen

Stephen, That's true and I am going to include the reflow... - Feb 26, 2013 by Anton99

gwego

#68085

How SMT Line Change over is measured? | 3 February, 2013

how do you measure the overall change over time of an smt line? where does it starts and end? lets standardize

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Sr. Tech

#68088

How SMT Line Change over is measured? | 4 February, 2013

Changeover starts when the last board from the work order goes into the reflow oven.

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A Very Frazzled Man

#68089

How SMT Line Change over is measured? | 4 February, 2013

Agreed, and stops when the first completed PCB of the next run goes in the oven. After 1st piece verification.

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gwego

#68098

How SMT Line Change over is measured? | 4 February, 2013

Thanks a lot. btw, is there a standard for this measure or technical paper to where we can base?

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gwego

#68154

How SMT Line Change over is measured? | 10 February, 2013

anybody can share if there are publications/whitepaper relating how SMT Change-over is Measured? thanks in advance

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dyoungquist

#68252

How SMT Line Change over is measured? | 20 February, 2013

If you stop when the first completed PCB of the next run goes in the oven, wouldn't you be including the loading time for that PCB in your change over time?

Wouldn't change over time be from the time your p-n-p machine stops loading the last board of a batch until your p-n-p machine starts loading the first board of the next batch?

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A Very Frazzled Man

#68256

How SMT Line Change over is measured? | 20 February, 2013

Actually, we calculate it BOTH ways, and track each of the two times. TOTAL changeover time starts when the last board of the previous run enters the oven and stops when the first board of the next board enters the oven. (Much the same way you would calculate Cycle Time). Machine Down Time Due to Changeover would start whan the last SMT Machine completes the last PCB of the previous run, and stops when the first PCB of the next job enters the first SMT Machine.

The reason we track both times is because Total Changeover is more than just downtime of the machines. It should include the time needed to verify the first assembly. (1st Article Inspection) By recording these times independantly, it's easier to see what areas need improvement.

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gwego

#68274

How SMT Line Change over is measured? | 22 February, 2013

Hi Frazzled Man,did you mean this way?

end - 1st piece of product "B" goes into the oven after 1st piece verification.

does 1st piece of product "B" means it is the second piece of Product "B"

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gwego

#68275

How SMT Line Change over is measured? | 22 February, 2013

Hi Frazzled Man,did you mean this way?

end - 1st piece of product "B" goes into the oven after 1st piece verification.

does 1st piece of product "B" means it is the second piece of Product "B"

reply »

A Very Frazzled Man

#68276

How SMT Line Change over is measured? | 22 February, 2013

We've had a lot of turnover with our operators, so currently we do a complete 1st article inspection before sending any PCBs in to the Reflow Oven. So our first PCB in the oven is the 1st PCB of the new job. (after it's been inspected).

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Stephen

#68312