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Date: | Thu, 26 Dec 96 08:59:46 PST |
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LMorse,
Your placement equipment's software should be able to help you. It
keeps track of the number of picks and attempts for each location.
You can study these numbers for a week and finding out the average for
the machine and part it's capability of placement. You will note that
for each assembly machine program , machine calibration and
maintenace, part characteristics, machine setup, end of tape, machine
vision calibration, pcb layout & pads affect the attrition rate.
Attrition can vary from less than 1% to as much as 3%. Another waste
is using a leader with components. Require your supplier to add what
your requirement for tape lead and end lengths without components.
Typical average is about 2% on reels up to 1500 and less than 50pcs
for larger reels up.
______________________________ Reply Separator _________________________________
Subject: Re: ASSEM: Component attrition during placem
Author: [log in to unmask] at uucpmail
Date: 12/23/96 20:17
How do you 'waste' components during placement?
>
> I am attempting to arrive at a reasonable figure for the amount of
>components that should be provided for SMT assembly, over and above the
>actual component count needed to complete the boards (i.e. to compensate for
>components wasted during placement). 1%, 3%, 5%, or whatever. If you know
>of an industry standard, or have a company policy, I'd like to know what it
>is. My email address is "[log in to unmask]". Thanks.
>
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