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Subject:	Re: SMT Component Loss Percentages
From:	"d. terstegge" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 3 Jan 2002 10:28:47 +0100
Content-Type:	text/plain
Parts/Attachments:	text/plain (44 lines)

Hi Dave,

Where I work we calculate with a loss of 2 percent. For lot sizes of 50-200 this seems to be an acceptable figure, but only as as an average.  
With smaller lots (i.e. prototypes) the losses can be much more severe, i.e. you can easily loose 20 small chipcomponents when mounting the tape into it's feeder, so if your pick&placing 10 of these the loss is 67 percent ! 

Daan Terstegge
SMT Centre
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net


>>> Dave Snyder <[log in to unmask]> 01/02 8:43 pm >>>
What is the expected part loss in the pick and place process? I assume the
percentages are different depending on the type of part and size. It's
probably is much better if the lots are very large, however we manufacture
board assemblies in small lots (50-200). Is there an IPC document that lists
"normal" levels or guidelines? Any help would be greatly appreciated, even
wild guesses.

Thanks
Dave Snyder
Manufacturing Engineering Manager

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