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<blockquote data-quote="greybeard" data-source="post: 1042148" data-attributes="member: 18945"><p>The first "automatic" lathe I ever worked with used punch cards--others used tapes. NC instead of CNC. </p><p>In the early 80s I went to a big oilfield auction and saw dozens of big mills and lathes, still in perfect working order on the auction block and they all sold to overseas buyers or sold for scrap prices as CNC took over the job of G coding. Big machines, threaded full joints of drill pipe and big casing. Same sale had pallets of those special "typewriters" that punched the paper tapes and cards. Boxes and boxes of blank cards. </p><p></p><p>I ran both a CNC saw and a CNC point to point machining center from 1999-2006. Writing G code became easy, but you still had to zero out--"tell" the machine where the edges and top of the blanks were. Saw and caused some pretty good wrecks when leaving out a - on the code.</p><p>Now the machines have optical scanners that do all that for ya.</p><p></p><p>The TI-30 and 31 were the standard when I was going to Gas Turbine school. A couple of people had a TI 50---$150 a pop!!</p><p>Now you can buy a decent graphing calculator for under $100.</p></blockquote><p></p>
[QUOTE="greybeard, post: 1042148, member: 18945"] The first "automatic" lathe I ever worked with used punch cards--others used tapes. NC instead of CNC. In the early 80s I went to a big oilfield auction and saw dozens of big mills and lathes, still in perfect working order on the auction block and they all sold to overseas buyers or sold for scrap prices as CNC took over the job of G coding. Big machines, threaded full joints of drill pipe and big casing. Same sale had pallets of those special "typewriters" that punched the paper tapes and cards. Boxes and boxes of blank cards. I ran both a CNC saw and a CNC point to point machining center from 1999-2006. Writing G code became easy, but you still had to zero out--"tell" the machine where the edges and top of the blanks were. Saw and caused some pretty good wrecks when leaving out a - on the code. Now the machines have optical scanners that do all that for ya. The TI-30 and 31 were the standard when I was going to Gas Turbine school. A couple of people had a TI 50---$150 a pop!! Now you can buy a decent graphing calculator for under $100. [/QUOTE]
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