On Sunday, March 25, 2012 04:46:30 AM Erik Christiansen did opine: > On 24.03.12 23:47, gene heskett wrote: > > The standoffs to hold the card at the correct elevation might be > > though. If I just cut tubing, I'll need full inch long 4-40 bolts. > > And I haven't seen any of those critters recently. Fasten-all quits > > at 3/4", I was there last week. :( > > Not sure what size "4-40" is,
American std 'machine screw', size 4, 40 tpi. tap drill is supposed to be a #43, so its about a blond one smaller than the 3mm, which is closer to our #6 (I think, I can't do those conversions in my head) I usually up the tap drill to a .0925" which is the next size up in fractional inch stuff. Taps don't wind up plugging the hole near as often because they broke. These folks never heard of aluma-tap for cutting oil either. > but I've bought two foot lengths of nearly > 3mm (a bit under 1/8") all-thread, plus nuts, from the hardware store. We could too a couple decades ago, but the minimum size commonly available now is 3 foot of 1/4-20. And it isn't at all well made, lots of ripped edges from dull dies, undersized & galvanized to look purty. Purty ugly that is. ;-) > (It's just dangerous to go in there though, because the big mothers we > have these days are a couple of acres under one roof, with so many > aisles of good stuff, that it's a great idea to eat lunch before going > in.) Sounds like our Lowes stores. With my worn hip joints, I grab an electric sit down cart, then run clear to the other end and collect a coffee from near the contractors checkout. > Alternatively, I've also bought a couple of small taps, so I can turn > some scrap Alu down to a suitable standoff diameter, then drill & tap > the ends, and use up some of the bucket of short screws cluttering up > the place. That might be neater, and doable with what's to hand. I would do that if I could buy alu rod, but my scraps are usually just that and recycled. But I also haven't checked the alu bins for small rod recently. Plenty of strap and angle in a good size variety, and I use 1/4" angle for small brackets. Fiberglass rod for electric fencing posts but I've not had any great luck drilling and tapping that stuff, its hell on carbide tooling. > Erik Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Remembering is for those who have forgotten. -- Chinese proverb ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
