I have two lamps I should put in roof with M7 screws. The old ones are to short and nobody sells M7.
On Sun, 8 May 2016 05:54:19 -0400 Gene Heskett <[email protected]> wrote: > On Sunday 08 May 2016 02:59:12 Peter Blodow wrote: > > > Gene, > > > > M7 screws are as rare as white raven since this thread is only > > printed in fine italics the DIN book. The only place I know of them > > being used is for fastening the cooler fan of some Renault vehicles, > > but merely in left handed version. No kidden. The French are supposed > > to use M7 more frequently, like in constructing basement storage > > shelves, but, as the saying goes, cooks in hell are english and > > mechanics in hell are french... There is not much good with M7 anyway > > since the threads are the same pitch as M6, so their holding force > > will be about equal to M6, just making bolts heavier. Wonder how in > > the world you got to own M7 cutting tools, I know nobody who ever even > > saw one? (I myself have a left handed one, by buying a wholesale box > > from the flea market). Moreover: If you managed to strip the M6 > > threads out, you won't gain much by replacing them with M7 since > > thread depth is just the same. > > > > Use M8 and you're out of trouble, 25% more depth (if there is > > sufficient spindle diameter). By the way: why don't you just cut those > > spindle threads by hand, anyway, why bothering your itsi bitsi machine > > and PSU with it, or did I miss something? On the other hand, owning a > > lathe, why don't you make your own bolts to any size you want? I often > > have to make strange, e.g. imperial threads and others, like camera > > adapters (using pure unobtainium, as you say). It's easy. > > > > Greetings > > Peter > > > Been considered, but I have only done one socket headed bolt in my life, > and it was difficult. Hex head I can finish on the toy mill, but my > starter stock for such is 1/2" A2 rod. Lots of waste. However its been > pointed out that 7mm might be only a small percentage stronger, so I > wouldn't gain a lot of thread strength. And since its already threaded > 7mm x1, I might not have enough to cut the 8mm thread cleanly. But 10mm > OTOH, I could bore with my threading boring bar I believe, since it can > be driven by g76 on my toy lathe. So I'll get some 20mm, 25mm and 30mm > long in both 8 and 10 from TSC later today so I can grab various > thickness's of stuff on this arbor, and still have 15mm of thread > engagement regardless. That was part of the original strip failure, I > needed a longer bolt to get more than about 5mm of thread engagement, > and my next longer bolt was hitting the bottom of the tapped hole or the > end of the threads since the tap is a long nose, not blind. Clearly I > need a better selection of taps too. > > All I need is a little red wagon load of money for that, even from > fleabay. So we'll see what I can source yet today, and proceed > accordingly. > > As for where I got that 7mm tap that someone asked, it was part of a > metric tap & die kit I got from Lowes several years ago, for about a $50 > bill at the time. In a flat, grey plastic form fitted molding with a > clear plastic cover lid dovetail fitted. The die handle has long since > failed of course. Die cast pot metal. The taps aren't Mibro's but in > the larger sizes, they have held up well. For the money, Mibro makes > good drill bits and taps. Much better than todays Hansen brand. > Considerably sharper, and not near as brittle. > > > Am 08.05.2016 05:49, schrieb Gene Heskett: > > > Greetings all; > > > > > > Trying to hold a 10" diamond saw blade yesterday, tight enough to > > > keep it from slipping, I striped out the 6mm threads in my arbor. > > > > > > So today I bored it gently out to around .230" or 15/64's and > > > re-tapped that to 7mm x1.0. It wasn't until I was cleaning that up > > > that I realized I had not seen any 7mm x1.0 screws on my side of the > > > planet. So I assume that I may as well redo it for an 8mm screw > > > tomorrow. > > > > > > But that will be loads of fun because with the 7mm tap in the chuck, > > > I had to keep asking for a smaller peck per stroke because even in > > > low gear, and the current limit in Jon's servo amp set to limit at > > > about 15 amps, 150% drive for that motors nameplate, I was raising > > > the divider that determined the additional stroke per peck until it > > > was taking at least 7 or 8 pecks to tap one additional mm deeper. > > > Combine that with the tap I was using have a longer that normal nose > > > taper, I hit the bottom of the hole and that locked the spindle so > > > I'm standing there, noting the spindle had stopped and jon's servo > > > amp was singing as it overload regulated. Stopped lcnc, loosened > > > the chuck to release the tap, ran the head up 6" or so, and > > > unscrewed the tap from the hole. Threads look great, but I suspect > > > there is not a 7mm cap screw about in these here parts. Pure > > > unobtainium comes to mind for the alloy. :) > > > > > > So, just out of curiosity, are 7mm bolts really that hard to find, > > > or am I looking in the wrong local stores? > > > > > > NAPA perhaps? Pricy there though. Seems metric in the label makes > > > them an additional $2 a bolt or nut. Been there, done that. Should > > > have gotten a free t-shirt for the price I paid for a 6 pack of 8mm > > > self lockers. Bah. > > > > > > Home Depot, up in Bridgeport, 26 miles up the Super-Pot-Hole, aka > > > I-79 has the best stock ATM, but I cannot recall seeing any 7's. 8's > > > I can probably get locally at Tractor Supply. In a decent alloy > > > even. > > > > > > I also think my 8mm tap is a lot sharper than the black oxide > > > finished 7mm is, so maybe I can get by driving it with the mill. > > > We'll find out tommorrow. > > > > > > Thanks everybody. > > > > > > Cheers, Gene Heskett > > > > --- > > Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. > > http://www.avast.com > > > > > > ---------------------------------------------------------------------- > >-------- Find and fix application performance issues faster with > > Applications Manager Applications Manager provides deep performance > > insights into multiple tiers of your business applications. It > > resolves application problems quickly and reduces your MTTR. Get your > > free trial! > > https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > ------------------------------------------------------------------------------ > Find and fix application performance issues faster with Applications Manager > Applications Manager provides deep performance insights into multiple tiers of > your business applications. It resolves application problems quickly and > reduces your MTTR. Get your free trial! > https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
