Types of instruction CNC TOOL
A line in a G-code file can instruct the machine tool to do one of several things.
Movements
The most basic motion for a controller is to move the machine tool along a linear path from one point to another. Some machine tools can only do this in XY, and have to accept changes in Z separately. Some have two further axes of rotation to control the orientation of the cutter, and can move them simultaneously with the XYZ motion. Lately 4, and 5 axis machines have become popular. The 2 additional axies allow for the work surface or medium to be rotated around X and Y. For example, a 4-axis machine can move the tool head in XY and Z directions, and also rotate the medium around the X or Y axis, similar to a lathe.This is called the A or B axis in most cases.
All motions can be built from linear motions if they are short and there are enough of them. But most controllers can interpolate horizontal circular arcs in XY. See CNC circular arc motions for further details.
Lately, some controllers have implemented the ability to follow an arbitrary (NURBS) curve, but these efforts have been met with skepticism since, unlike circular arcs, their definitions are not natural and are too complicated to set up by hand, and CAM software can already generate any motion using many short linear segments.
A line in a G-code file can instruct the machine tool to do one of several things.
Movements
The most basic motion for a controller is to move the machine tool along a linear path from one point to another. Some machine tools can only do this in XY, and have to accept changes in Z separately. Some have two further axes of rotation to control the orientation of the cutter, and can move them simultaneously with the XYZ motion. Lately 4, and 5 axis machines have become popular. The 2 additional axies allow for the work surface or medium to be rotated around X and Y. For example, a 4-axis machine can move the tool head in XY and Z directions, and also rotate the medium around the X or Y axis, similar to a lathe.This is called the A or B axis in most cases.
All motions can be built from linear motions if they are short and there are enough of them. But most controllers can interpolate horizontal circular arcs in XY. See CNC circular arc motions for further details.
Lately, some controllers have implemented the ability to follow an arbitrary (NURBS) curve, but these efforts have been met with skepticism since, unlike circular arcs, their definitions are not natural and are too complicated to set up by hand, and CAM software can already generate any motion using many short linear segments.
posted by SEAGAMES 2009 @ 6:13 PM,
