09-05-2012, 10:42 AM
Automatically programmed tooling
Automatically programmed tooling.ppt (Size: 219 KB / Downloads: 116)
APT
It is a three dimensional NC part programming that was developed in the late 1950s and early 60s.
The most of the CAD/CAM approaches to the part programming are based on APT.
APT is important because many of the concepts incorporated in to it formed the basis for other subsequently developed systems in interactive graphics.
Modern version of APT can be used for both point to point operation and contouring operations in up to five axes.
There are more than 500 words in APT vocabulary.
STATEMENTS IN APT
Geometry statements-used to define the geometry elements that comprises the part.
Motion commands-used to specify the tool path.
Post processor statement-control the machine tool operation, feed ,speed etc
Auxiliary statements-a group of miscellaneous statements used to name the part program, Insert comments in the program
GEOMETRY STATEMENTS
The geometry of the part must be defined to identify the surface and features that are to be machined.
the points, lines and surfaces must be defined in the part program
GENERAL FORM OF AN APT GEOMETRIC STATNENT