On 5/23/2012 7:44 PM, andy pugh wrote: > On 24 May 2012 00:37, Claude Zervas<cla...@utlco.com> wrote: > >> According to "The NIST RS274NGC Interpreter, version 3, NISTIR 6556 >> (2000)", section 3.5.4, the G04 parameter 'P' is in seconds... >> >> there you have it. > Yes and no. Because NIST wrote EMC… >
And NIST does not promulgate engineering standards despite the presence of the word "Standards" in its name*. The NIST Interpreter contained in EMC isn't a standard. RS274NGC isn't a standard. It's quite possible that the parameter 'P' is defined to be in seconds because Tom Kramer had to make a choice in the face of the silence of RS274D in the matter as already reported by Jon. It's also quite possible that this definition came about in the RS274NGC project and Tom merely implemented it. Maybe someone kept good notes:-) RS274D is a standard because it was developed and approved under the ANSI organizational umbrella and rules for voluntary consensus standards. DIN 66025 is a standard because it was developed and approved under the DIN rules for such. It's my understanding that the actual technical content concerning G-codes is substantially the same as RS274D, but I never paid the "heinously expensive" price to find out. ISO 6983 is a standard because it was developed and approved under the ISO rules for such. I make a similar claim and disclaimer for the actual technical content concerning G-codes. Legally, each of these is known as a de facto standard as opposed to a de jure standard. A buyer and a seller may choose to use them to guide their commercial transactions but there's no law requiring them to. Regards, Kent *PS - Back the 1980s when Congress was preparing to reorganize, expand, and rename the National Bureau of Standards, some of us thought it should be called "Standards-R-Us". The pedestrian name "National Institute of Standards and Technology" was chosen instead. Spoil sports. PPS - this name change gave me a great opening line for my talks, "I used to be a bureaucrat but now I've been institutionalized." ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
