S.S.White was the brand we used, course that was back in the good ole' days. And sand abrasion is (cough-gasp) dusty, tolerances are +/- 10% (better if you buy a good bridge w/control, but more $$$), VERY, VERY, (let me repeat, VERY) slow process and you have to design wider resistors, cause instead of the 2.5 mil laser kerf, you'll have a 50 mil wide gulley. I would recommend, if budget is strained, that you purchase a brand name used bare-bones YAG laser trimmer such as a Chicago laser model 33 or 37(they are now ESI, but the older models will still be Chicago) or an ESI model 44. There are real bargains out there and good spare parts support. Good luck! Jeff Hempton United Technology Electronic Controls ______________________________ Forward Header __________________________________ Subject: [TN] Chip resistor trimming Author: KK Chin <[log in to unmask]> at Internet Date: 8/13/98 10:29 AM Dear Technetters, I was told that abrasive trim is a lower cost alternative of laser trim for less stringent requirements. Can anyone tell me who make those equipment and what are the limitations (resistor size, precisions, reliability implications, etc.). Thanks! K.K. Chin Artesyn Technologies, Fremont, CA ################################################################ 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 ################################################################ ################################################################ 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 ################################################################