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Chapter 6 Cutter Compensation
155
I Programming
CHAPTER 6 CUTTER COMPENSATION
6.1 Application for Cutter Radius Compensation
6.1.1 Brief
Generally, the parts machining process is programmed according to parts drawing in one point on a
tool. As for the tool used actually, because of the processing or other requirement, the tool is not an ideal
point, but an arc only. The position offset exists between actual cutting point and ideal point when the
cutting feed is performed. It may cause over cut or undercut, so the part accuracy will be affected. So, the
cutter radius compensation can be used to improve the part accuracy in machining.
The path of part figure can be shifted by a cutter radius, which this method is called B type tool
compensation; this is a simply method but the movement path of next block can be processed only after a
block is performed, so the phenomenon as over cutting will be generated at the intersection point of two
blocks.
In order to settle the above issues and eliminate the error, the Tool compensation C should be setup.
When a block is read in, the tool compensation C is not performed immediately but the next block is read in
again. Corresponding movement path is calculated according to the point of intersection of two blocks
(conjunction vector). The tool compensation C performs more accurate compensation in figure because two
blocks are read for processing in advance. See the Fig. 6-1
6.1.2 Compensation value setting
The radius value of each tool should be set before tool compensation C is applied. Tool radius
compensation value is set in the OFFSET page (table 6-1), this page contains tool geometric radius and
tool radius wear. There into, D is the tool compensation value, when the bit 1 of bit parameter No.002 is 1,
the D is compensation value input by diameter. If the bit 1 of bit parameter No.002 is 0, the D is
compensation value input by radius. The following explanations are all indicated in radius compensation
value if not especially pointed out.
Table 6-1 Display page for CNC cutter radius compensation value
NO. Geometric
（
H
）
Wearing
（
H
）
Geometric
（
D
）
Wearing
（
D
）
001 20.020 0.030 5.000 0.020
002 10.020 0.123 0.500 0.030