30-pin SIMMS

Date sent: Sat, 27 Feb 1999 21:39:20 -0500 (EST) Send reply to: classiccmp(a)u.washington.edu From: Max Eskin <max82(a)surfree.com> To: "Discussion re-collecting of classic computers" <classiccmp(a)u.washington.edu> Subject: Re: 30-pin SIMMS Originally to: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Triple reasons: Manufacturing turned sockets or (shitty sprung leafs like the IC socket) is more expensive and more problemic. Lastly, trying to install or pulling SIPPs usually result in bent pins. Adding pins to already SIMM's design adds expense in extra parts and solder, labour. So we hail on SIMM's and DIMM's with vigor. Manufacturing regular simm slots, contacts all like cookies, stamped out of workhardened sheet. Punch, punch, punch! And it does over 1000's a minute. Then plated tin or gold depending on quality and some crass cheapiest ones used softer metals. Yeech. Those plastic socket bodies are simply one time molded and all the metal parts simply pressed or snapped into and do many real fast. That it. Punch machines can be size of a largish dorm fridge and it's totally mechanical spun at high speed with a 2 or 3 HP electric motor to punch out small parts up to 2" in area. While you have some dud parts, spend your time pulling those sockets of all types apart, Sometimes it comes apart by heat. Screws are born from roll of wire. Liberally sheared to length, rolled to form threads (not cutting), head mushroomed by a mold under pressure. That is why always can tell the heads is bit off center and sometimes mal-formed. Ditto on scale of number of screws made per minute, 1000's no surprise. Some get plated some painted. Quality screws are fully formed, no burrs, smooth. Crappy ones always chews out the holes and softer. Still have one screw that is threadless with fully formed head, found it when I was working on a PC. :-( ) Wizard