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Chapter 13: Feedrate Control
By Peter Smid
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From CNC Programming Handbook: A Comprehensive Guide to Practical CNC Programming, Second Edition
Feedrate is the closest programming companion to the spindle function. While the spindle function controls the spindle speed and the spindle rotation direction, feedrate controls how fast the tool will move, usually to remove excessive material (stock). In this handbook, the rapid positioning, sometimes called a rapid motion or rapid traverse motion, is not considered a true feedrate and will be described separately, in Chapter 20. FEEDRATE CONTROL
The cutting action may be a rotary motion of the tool (drilling and milling, for example), the rotary motion of the part (lathe operations), or other action (flame cutting, laser cutting, water jet, electric discharge etc.). The feedrate function is used in the CNC program to select the feedrate value, suitable for the desired action. Two feedrate types are used in CNC programming:
The most common types of machines, CNC machining centers and lathes, can be programmed in either feedrate mode. In practice, it is much more common to use the feedrate per minute on machining centers and the feedrate per revolution on the lathes. There is a significant difference in G codes used for machining centers and lathes.
Copyright Industrial Press 2003 under license agreement with Books24x7
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Machining centers are machine tools that are used to automatically repeat operations on a workpiece. They are usually numerically controlled. Operations include drilling, reaming, tapping, milling, and boring.
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Lathes and turning centers cut a rotating part with a stationary cutting tool. The tool moves parallel and perpendicular to the workpiece axis to provide the desired finished shape.
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Specialty machine tool components are specialized or proprietary products and accessories for machine tools.
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Milling machines move a clamped workpiece into a fixed, rotating cutter; or move the cutter itself into a stationary workpiece. There are two basic configurations: vertical and horizontal.
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Topics of Interest
Each numerically controlled machine using an automatic tool changer must have a special tool function (T function) that can be used in the program. This function controls the behavior of the cutting...
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Feedrate is the closest programming companion to spindle function. While the spindle function controls spindle speed and spindle rotation direction, feedrate controls how fast the tool will move,...
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THREADING FEED AND SPINDLE SPEED
Regardless of any active cutting motion, there is always a feedrate involved - this feedrate controls how effectively the tool removes material in various operations...
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OVERVIEW
Both types of CNC machines, machining centers and lathes, use spindle rotation when removing excessive material from a part. Spindle rotation may be that of the cutting tool (milling) or...
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THREADING FEED AND SPINDLE SPEED
In threading, the choice of the cutting insert, the spindle speed and feedrate selection are rather restricted. Both, the cutting tool and the feedrate are...
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