Those bolts would be whitworth.
On Dec 15, 2011, at 14:43, "Steve ." <iteratio...@gmail.com> wrote: > The laboratory where i work obviously reports results using the SI metric > system. There is one exception though, and that is the energy side, > specifically calorimetry. At first glance the calorimeters appear to > normal(SI, that is). They take mass in terms of the gram, measure > temperature by degree Celsius, and internal calibration is stored as > calories. > > The exception is the result is reported in BTU/ pound! How's that for > mixing systems? > > On the electronics side of things it's even worse. Technical documents > mixing and matching between systems. It's very common to see specifications > cited partially in MKS and CGS with no correction terms. > FYI: > MKS = Milimeter Kilogram Second > CGS = Centimeter Gram Second > > I've seen two other systems, but their names are eluding me at this time. > Also, I've come across bolts that are not SI, nor SAE. I believe they are > considered a british thread but i'm not certain. > > Steve > > On Thu, Dec 15, 2011 at 1:15 PM, Don Latham <d...@montana.com> wrote: > >> What I find interesting is that the first push for standardization, at >> least for machine threads, came from the manufacture of arms, the >> Springfield Armory, at the time of the Civil war. At that time, threads >> were a mixture of the then fledgling metric system (French) and a >> conglomeration of American threads. Thread shapes were quite different >> as well. The next big standardization came from- you got it- the >> automotive industry (SAE is of course Society of Automotive Engineers), >> and I guess, only a guess, that the reluctance to change to metric >> really came from the automobile industry. At one time, the Volvo had >> SAE, Metric, and Whitworth fasteners in it, and not too long ago at >> that. >> So, I think that manufacturing inertia rather than the housewife might >> be to blame for the US still being SAE and all that implies. As bolts >> go, so do the rest of the measurements. >> Don >> >> >> Chris Albertson >>> On Thu, Dec 15, 2011 at 9:29 AM, Dan Kemppainen <d...@irtelemetrics.com> >>> wrote: >>>> >>>> On 12/14/2011 3:59 PM, time-nuts-requ...@febo.com wrote: >>>>> >>>>> It's not like metric is totally absent. We drink 2 liter cokes and >>>>> defend >>>>> ourselves with 9mm pistols. Our cars use mostly metric parts. Even >>>>> ham >>>>> radio operators, arguably the most jingoistic and set in the past >>>>> bunch >>>>> around, get on the 80, 40, and 20 METER bands. >>>> >>>> >>>> I agree with you, and funnily enough the rest of the NATO world uses >>>> 7.62mm >>>> and 5.56mm rifles. (Both were originally based on standard inch sized >>>> rifle >>>> cartridges designed in the US) >>>> >>>> The problem in converting to metric would require replacing a lot of >>>> tools. >>>> For example Mills, lathes, and other machining tools and measurement >>>> devices >>>> are expensive, and last for decades. >>> >>> Can you point one even ONE machine shop in the US that can make metric >>> parts? Those guys would have gone out of business years ago. Also >>> how many are still using hand cranks and reading veneer scales? Even >>> small one man ships are using CNC now. >>> >>> The US is slowly converting. It will take a long time. Even now if >>> you go to Home Depot and look at plywood you see the better (non >>> construction) grades sold in even millimeters with the inches being >>> some odd number of 32nds approximation. This will slowly creep into >>> more and more products. >>> >>> So the debate is silly. If the US should convert??? No. the only >>> question is how fast are we converting and when will we be fully >>> converted. Not even if this will happen, it will. >>> >>> >>> >>> >>> Chris Albertson >>> Redondo Beach, California >>> >>> _______________________________________________ >>> 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. >>> >>> >> >> >> -- >> "Neither the voice of authority nor the weight of reason and argument >> are as significant as experiment, for thence comes quiet to the mind." >> R. Bacon >> "If you don't know what it is, don't poke it." >> Ghost in the Shell >> >> >> Dr. Don Latham AJ7LL >> Six Mile Systems LLP >> 17850 Six Mile Road >> POB 134 >> Huson, MT, 59846 >> VOX 406-626-4304 >> www.lightningforensics.com >> www.sixmilesystems.com >> >> >> >> _______________________________________________ >> 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. >> > _______________________________________________ > 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. _______________________________________________ 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.