It is pretty easy to see WHY the z-axis is set up the way it is on a lath and a mill and why it is different. You need a well defined “zero”. On a mill, the machine's “zero" is the table and one a mill it is the chuck. A lathe has not other well define place on the machine, the tailstock moves.
The after defining the zero point you use the “natural” convention the number get bigger if you go to the right or up. This is the normal way engineers thing about corodrnttes. you ask thee questions IN ORDER 1) where is the origin? 2) which way does “Z” point 3) then apply the right hand rules for X and Y It’s not just machine tools that do this but everyone from physic research to aircraft manufacturing. And you do have to answer those question in order. #2 is really arbitrary but from 8th grade algebra on, we are used to drawing graphs with the numbers getting bigger as you go up or right and with the zero point inthe lower left > On Feb 6, 2024, at 6:06 AM, gene heskett <ghesk...@shentel.net> wrote: > > On 2/6/24 07:54, Stuart Stevenson wrote: >> Ray Henry's story is a Murphy's Law occurrence. I once had a car with a >> starter problem. I changed the starter three or four times in quick >> succession. I could not figure out why so I purchased two, put one in the >> trunk along with tools. I never had to use it. > Chuckle. BTDT...Still do at times. Works better than average. But the way Ray > worded it caught me off guard and I literally shook myself laughing for quite > a spell. I spent some time in Iron Mountain MI, about a long hour from Ray's > place, so I visited a couple times while modifying the tv station there for > digital. > > If you ever come across any more of those teeny ball screws like you sold me > around 20 years back I've got a place to put them. > > Take care & stay well, Stuart. > > Cheers, Gene Heskett, CET. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
