On 6/1/2013 5:42 AM, Gene Heskett wrote: > On Saturday 01 June 2013 05:33:33 Gregg Eshelman did opine: > > >> --- On Fri, 5/31/13, andy pugh<bodge...@gmail.com> wrote: >> >>> From: andy pugh<bodge...@gmail.com> >>> Subject: Re: [Emc-users] Adjustable Kinnematics? >>> To: dengv...@charter.net, "Enhanced Machine Controller (EMC)" >>> <emc-users@lists.sourceforge.net> Date: Friday, May 31, 2013, 6:51 PM >>> On 1 June 2013 01:45, dave<dengv...@charter.net> >>> >>> wrote: >>> >>>> In that vein I heard a story about a piece being >>>> >>> machined at Hanford. >>> >>> >>>> The dwg called for a hole xxx in dia yyy in depth >>>> >>> within this very >>> >>> >>>> complex part. The machinist did it as called out but >>>> >>> the drawing was >>> >>> >>>> wrong. >>>> >>> "Drawing wrong" can lead to long arguments. I have made >>> drawings like >>> that. I had 1mm tolerance on several things, and .01 on a >>> very thin web. They machined to nominal dimensions…. >>> >> Somewhere on the web (I can't find it now) is a hilarious RFQ rejection >> form with checkboxes for many reasons why a shop can't or won't do a >> job. >> >> One of them is something like Zero or negative wall thickness. We don't >> care if your part is gone when we're done machining, we're still >> getting paid. >> >> > I remember some stuff like that that Martin-Marietta had back when we were > building the original Titan I's in '60-61, shop drawings, complete with > part numbers to request of a bunch of special bolts that might be needed if > the holes didn't line up etc. Totally impossible to make, or install, > stuff. Folks would stop& stare at that for several minutes until it > dawned on them that some draftsman had entirely too much time on his hands. > > This if it can be found again, and a fresh copy of that I'd love to post in > my shop for the entertainment value. > > Cheers, Gene >
Some things never change. A local company hired a new engineer who made some drawings for a prototype machine. Everything was dimensioned in inches and the engineer had 4 digits to the right of the decimal point on many of the dimensions with no notes on required precision. The local company has a machine shop but they were too busy to make the parts so they sent the job out to a large local machine shop that has a large number of state of the art CNC machines. The RFQ was returned with a handwritten note saying that they can make the parts as drawn, but that they would be unaffordable.. please call to discuss. :-) I caught the frustrated machine shop manager as he was headed towards the newbie engineers desk to chew him out for wasting his time. He won't make that same mistake twice! Dave Cole ------------------------------------------------------------------------------ Get 100% visibility into Java/.NET code with AppDynamics Lite It's a free troubleshooting tool designed for production Get down to code-level detail for bottlenecks, with <2% overhead. Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
