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. > *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************