NC part programming, how spindle speed of 730 rpm is coded by the magic -3

Precision Machining Technology (MindTap Course List)
2nd Edition
ISBN:9781285444543
Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes
Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes
Chapter8: Computer Numerical Control
Section8.7: Cnc Milling: Setup And Operation
Problem 9RQ: Which machine mode allows short, temporary program commands to be entered for operations such as...
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In NC part programming, how spindle speed of 730 rpm is coded by the magic -3 rule.

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