riks@teklds.UUCP (Rik Smoody) (05/18/85)
> > BTW, anyone want to give a history on "no go", which seems to be > >orphaned in this world of the Space Age? > I seem to recall from somewhere that decision points were known as "GO, NO GO" > points. I think it may have come from some text on computer algorithms, > but I'm not sure, it could also be from the space agency. I suspect it's nothing so high-tech as that: suppose you are making mechanical parts with a tolerance range. Instead of measuring carefully with a micrometer, and comparing the value to the upper and lower limits, you create a "fixture" with two gaps: one is at the lower limit, one at the upper. Now your part should GO through the big hole, but not (NO GO) through the small hole. You spend a bit of time setting and callibrating your jig, but it saves a bit of time for each of thousands of parts. I heard of these back in high-school shop classes. Rik Smoody - they disclaim me around here, too. uucp: {ucbvax,decvax,pur-ee,cbosg,ihnss}!tektronix!teklds!riks CSnet: riks@tek ARPAnet: riks.tek@rand-relay US: 2400 NE 25th, Portland, OR 97212 or: MS 94-442, PO Box 4600, Beaverton, OR, 97075 AT&T: (503) 249-8300, 629-1237
wmartin@brl-tgr.ARPA (Will Martin ) (05/21/85)
>> > BTW, anyone want to give a history on "no go", which seems to be >> >orphaned in this world of the Space Age? >> ... decision points were known as "GO, NO GO" >> points. I think it may have come from some text on computer algorithms, >> but I'm not sure, it could also be from the space agency. >I suspect it's nothing so high-tech as that: suppose you are making >mechanical parts with a tolerance range. GO/NO-GO gauges are standard tools in gunsmithing, to check the headspacing of rifle chambers; I've seen references to such gauges in texts from the WW I era and earlier. I suspect this was NOT the origin of the term, but that it was borrowed from then-standard machinists' terminology. So I'd put the origin of the term somewhere prior to 1900. Maybe you can find an old engineering reference work that will cite such usage?