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« on: February 23, 2009, 03:19:26 PM »
If you are running in G94 feed mode then no matter what you do to the spindle speed the feed will not change when in G97 spindle mode.
If you run in G95 feed mode and G96 spindle mode then the feed and speed are locked together and the feed rate increases/decreases as the spindle speed rises and falls.
In G97 spindle mode with a feed of 1 unit per minute (G94) and a spindle speed of 1000 the feed rate is 1/1000 = .001/rev if you then drop the spindle speed to 500 rpm then the feed is still 1 unit per minute but the feed rate is .002/rev
G94 is feed per minute e.g. F1.0 = 1" or 1 mm per minute, axis will move this distance in 1 minute.
G95 is feed per spindle revolution e.g. F.01 = .010" or .01mm feed per rev
G96 is constant surface speed e.g. S100 = 100 feet or 100 metres/min spindle speed, speed increases as cut diameter gets smaller.
G97 is fixed speed e.g. S1000 = 1000 revs per minute.
Graham