Graham, The bulk feeder usually has an orientation option for resistors that uses a photocell to measure the reflected light off of the bright (ceramic) or dark (black/blue0 surface and rejects upside down chips. Feeders specific to chip capacitors do not have this option or it is not installed. Good Luck! > -----Original Message----- > From: Collins, Graham [SMTP:[log in to unmask]] > Sent: Thursday, August 13, 1998 12:55 PM > To: [log in to unmask] > Subject: Is resistor orientation (upside down) a concern? > > Technetter's > A theoretical question.. It has been my understanding that surface > mount resistors had to be mounted right-side up (white side down) to > facilitate the proper heat dissipation from the part. Is this in fact > true or have I been misinformed? > If true, how do I manage to keep them right-side up if I'm using a > bulk feeder where the part orientation is not controlled as it is on > tape? > > regards, > > Graham Collins > Process Engineer > Litton Systems Canada > (902) 873-2000 extension 215 ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################