3 Basic Motion Types in a CNC Machine
A Computer Numerical Controlled (CNC) machine may have more than one motion type that it uses, but there are three most common motion types that are easy to remember. These are the Rapid Motion, the Straight Line Motion, and the Circular Motion.
All of these motion types may seem different but they share two things in common, which would be that they are all modal and the endpoint of each motion is specified in motion command. By being modal it means that the motion type would be in effect until changed otherwise.
3 common motion types:
1.)Rapid Motion Type
Rapid motion type is also called Positioning. The way this motion type is used is through utilizing the fastest rate possible of the command motion of the machine. Example uses of rapid motion are moving to clear obstructions, placing cutting tools to and from the desired position, and any program that provides non-cutting in their schemes.
The command that is usually programmed to a CNC machine is G00 because in this command, the end point for the rapid motion would be specified.
The CNC machine, with most controls given, will be able to move as fast as possible in all commanded axes. In the case of rapid motion, one axis may be able to reach its end point before other axes. Straight line movement will not occur with type of rapid command function and the programmer of the machine must take into account that there are no obstructions to avoid. Straight line motion will happen even during rapid motion commands when done with other controls.
2.)Straight Line Motion
This type of motion would allow the programmer of the machine to command perfectly straight line movements within the machine. Unlike the rapid motion type, the straight line motion would allow the programmer to vary the rate of the motion or feed rate to be used during the movement. Examples of using straight line motion would be turning a straight diameter, taper, when milling straight surfaces, and when drilling for this is because these examples require straight cutting movement.
The common word to specify a straight line motion into a machine would be G01, for within this command the programmer will include the preferred end point within each of the axes.
3.)Circular Motion
This motion type would cause the machine to move in the direction of a circular path and is used to generate the radii in machining. When talking about points on circular motion feed rate, it is equal to that of straight line motion.
Other than that of straight line motion and rapid motion, there are two G codes that are commonly used when programming a circular motion into a machine. These are G02 and G03. G02 is used when the programmer desires a clockwise motion into the machine while G03 is used to make an anti-clockwise motion. To know which of the commands to use, the programmer must view the movement with the same perspective as to what the motion of the machine will be, may it be clockwise or anti-clockwise.
Another requirement that would be programmed into a machine that would be using circular motion is that the programmer must specify the radius of the arc that is to be generated. With brand new technological advances in CNC, an “R” word is now used to specify the radius.
For older controls in CNC machinery, an “I”, “J”, and “K” are used to specify location of the center point of the arc.
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This site is a common sense guide to 3 Basic Motion Types in a CNC Machine. In practical advice websites, like anything else in life, there are no guarantees of income made. Readers are cautioned to reply on their own judgment about their individual circumstances to act accordingly.
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The CNC Family
When To Shove People Out To Make Way For CNC
CNC Machine Setup and Operation
Pad Printing with CNC
CAM: A Vital Component of CNC
In Depth Discussion In Planning CNC Programs
Motion Control - The Heart of CNC
Cycle Time Reduction Principles for CNC Machining Equipment
Meet Your "Other" Employees: The Basic Parts of a CNC Machine
Practical Applications of CNC
The Different CNC Machines
Weighing Technology's Offers: The Pros and Cons of a CNC Job
People You Will Need When You Already Have A CNC Machine
3 Basic Motion Types in a CNC Machine
Understanding CNC
What It Takes to be a CNC Operator
Industries That Constantly Define CNC Precision
My Bestfriend's Name Is CNC: A Company’s Perspective
Programming 101: CNC
How CNC Helps Companies
Pros and Cons in Sheet Metal Manipulation with CNC
Data Transfer Methods of CNC
Programming CNC Machines With G-Codes
CNC Programming Tips the Professional Way
How To Effectively Consider CNC
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