nSCAD, try without exporting to STL and re-importing. That should improve things. -Marius

uching before sticking my fingers into any sensitive circuits. Works for me. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

kly as they have fibre diameters of about 20 microns or so, but even at 20% RH static charges dissipate in seconds. Plastics, however, tend to be very non- conductive and charges can be held for hours. Also, some plastics form electrets which stay "charged" even under water. A great insight to the static electricity problem came from articles I read as a young boy in old (1910) articles such as "make yourself an electrophorous" in popular science mags. A can lid was filled with melted resin. When solid it was rubbed with wool. A metal disk with insulated handle was placed on the resin and grounded with a finger. The disk was then lifted off the resin and would be found to have a high charge (and voltage) on it. (half inch fat spark to ground) This process of induced charging and potential multiplication is the danger on work benches. The main way to overcome it is to have an isopotential environment which naturally occurs with natural materials where all charges rapidly drain away. Wood is good, it does not produce charge when rubbed and rapidly drains any charge away. And unless soaking wet it will not electrocute you if you are leaning on it when you touch and active power lead. (my theory from experience is that it is the ground that would kill you when if you were electrocuted. If you have good soles on your shoes and the other hand in your pocket an accidental touch to high voltage is survivable) just a few thoughts, Neville Michie > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ > time-nuts > and follow the instructions there.

here may have been some hiding that we missed, but all the static >damage I've seen has been pretty severe. > >That said, I always use a wrist strap and mat if I'm working on >something I don't want to break further. Installed components are generally much less vulnerable to ESD than bare parts, because there are leakage paths (both intentional and otherwise) on a circuit board that allow the ESD to flow around the component rather than through it. With a naked part, any ESD to one of its leads has to flow through its other leads or the case of the device, thereby maximizing any damage. Best regards, Charles

lue of some resistors. Now ESD control is just about everywhere! -Joe Fitzgerald KM1P

here we assembled a board with > all passive components, so no thought was given to ESD control. We traced > a series of mysterious failures to ESD affecting the value of some > resistors. Now ESD control is just about everywhere! > > -Joe Fitzgerald KM1P > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

ng all kinds of things, so good clues may still lay around if you dare look for them. Thanks for remembering this stuff. Cheers, Magnus

ry lucrative military/space 6800 market, so the chip had to match or exceed the 6800 on all points, including accidental damage. The first version, the 6501 was in fact pin- but not instruction-compatible with 6800, but Motorola had a legal fit and MOS gave up on that idea. The fact that 6502 mainly ended up in Commodore computers was mainly a matter of its lower price. Later the crash in microprocessor prices saddled Jack Tramiel with a huge overpriced inventory which made him outright buy MOS to avoid a repeat performance of that problem. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

w.exo.net/~pauld/summer_institute/summer_day14electrostatic/Electroph orus.html http://www.exploratorium.edu/science_explorer/sparker.html bill@iaxs.net said: > My first job was in a blasting cap plant in 1960. There were military > devices so sensitive they could be set off by turning on a nearby > fluorescent desk lamp. Fond memories... In 1960, I was in high school. A couple of classrooms had new chairs with a plastic seat and a steel frame. They were great for generating static. I had shoes that were good insulators. I could charge up on one of the chairs and walk down the hall to the lockers and still give somebody a serious zap. The chairs had 4 big round-headed bolts that went through the seat to hold it to the frame. As the typical male was sitting down, a certain sensitive part of their anatomy was closest to the bolt. We learned quickly. I got very good at hitting a leg of the chair with my foot/ankle as I was sitting down. -- These are my opinions, not necessarily my employer's. I hate spam.