The Atlas 10¡± and Atlas built 12¡± came with the same 16 RPM list.? As I said before, what surface speed you need to be running depends upon three things ¨C diameter of the work piece, material and sometimes heat treat condition ?of the work piece, and composition or type of cutter.? Swing of the lathe is never in the equation because you can¡¯t swing a part that is larger than the lathe.
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The 16 nominal speeds that all 10¡± and 12¡± Atlas machines will do are:
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2072
1270
805
685
500
418
345
266
211
164
134
112
83
70
45
28
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I think that the chart was originally based on a motor with an average RPM of 1725.? 1740 and 1750 are more commonly quoted today but the difference is only 1.5%.
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The surface speed chart in the MOLO actually gives the nearest standard available speeds
However, aside from an argument of how to determine surface speed or equate rpm to surface speed, the main point of my post was to find out what the max rpm, as it came from the factory, is for my lathe. It had to have come out with this max rpm, whatever it may have been, for a reason. So, what was the max rpm as it came out from the factory? Does anyone know? 2486 seems too high to me.
