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How to identify SMT line's capacity

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#62094

How to identify SMT line's capacity | 21 June, 2010

Dear experts, I am new in this field, I try to figure out an SMT line’s capacity, but, it looks the capacity varying from a lot of factors, such as, number of component, layout of component, size of PCB… I am wondering if there is a simple but accurate way to show big bosses the capacity the line may have. Thanks a lot.

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#62099

How to identify SMT line's capacity | 22 June, 2010

Determine the capacity of the slowest element of the line.

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#62101

How to identify SMT line's capacity | 23 June, 2010

Thanks for the input and advise.

Yes, indeed, for single or just few products, to get the lowest ones should be no problem. However, I am facing so many products in the line, and the mix is changed all the time, it is difficult (for me, at least) to get a number to represent the capacity of the line, it is why I try to ask for a simple but accurate way to show the capacity and ignore the impact of product-mix changing.

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rem

#62110

How to identify SMT line's capacity | 24 June, 2010

Not sure what's in your line equipment wise, but you need to know relatively what kind of placements per day you run regardless of the mix. We run around 1.1 million across 5 lines in 3 shift.

Calculate what kind of placement per day on a specific line and divide it by the amount of hours you run, taking into account non value added time (lunches,breaks). This number of placements per hour is your 1st number. Then you would need to calculate a changer over time. When all is said and done your value added time is only about 4.5 to 5 hours in a 8 hour day. Take that number and multiply it by the placements per hour and you have a placements per day. This can be drilled down to weekly capacity or whatever you need. When your placement intake exceeds your available run time it's justified to add another shift possibly.

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#62131

How to identify SMT line's capacity | 28 June, 2010

Thank you very much for your reply.

I do have the numbers for placement per hour, but, I have some concerns on it (forgive me if it is a stupid concern, as I said, I am new in this field, and trying to figure out this business).

For example, it is quite different in terms of time spent for placing a chip (capacitor, resistor...) and an IC, if there are more IC in a PCB than the other, the placement per hour for these two PCBs (products) should be different, and this difference could impact to so-called capacity, it is why I mentioned product mix.

But, if I take all of them into consideration/calculation, that will be too complecate and not easy to explain to bosses while mix changing, so, I am trying to find a simple but accurate way to show the capacity.

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#62134

How to identify SMT line's capacity | 28 June, 2010

In 2002, the IPC released IPC 9850 for use in assessing placement machine performance.

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#62145

How to identify SMT line's capacity | 30 June, 2010

Thanks for the input.

I am reading IPC9850 and have a question on its statement.

========================================================== 4.2.9 Preventative Maintenance (PM) Time ... Calculation Method: Multiply the amount of time required for each PM procedure by the number of times it is required in 6000 hours and add these up for a grand total. ========================================================== (quoted from IPC9850)

Why 6000 hours?? Is there any reason??

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#62147

How to identify SMT line's capacity | 30 June, 2010

We're not sure, but as a guess: There's about 6000 hours in a man-year when working three shifts

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#62192

How to identify SMT line's capacity | 6 July, 2010

Thanks, it is pretty close...

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