The Jogging speed is determined by the Velocity you have in Motor tuning, you can however select different % of that as a slow jog rate and that is settable from the Tab screen. You can also override the slow jog by pressing the Shift Key and pressing the jog key, this will again give you your rapid speed as the jog speed. You can also set up incremental steps from that screen so that each press of the jog button will move the distance you have set as the increment.
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