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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