Number of Cutting Passes
The number of cutting passes required is determined by the following factors;
• Depth of cut
• Diameter of cutter in use
• Material being cut
• Edge finish
The order of priority of these factors is the responsibility of the Operator and Production
Manager and is usually made on a job by job basis. Sometimes two passes at a high feed
rate will actually produce a shorter cycle time than a single deeper pass that requires a
reduction in feed rate. The programmer must be made aware of these requirements prior to
programming the job for the machine.
Edge Finish
The quality of the edge finish is determined by the following factors;
• Requirement of the finished product
• Depth of cut
• Diameter of cutter in use
• Material being cut
• Wear of the cutter
The order of priority of these factors is the responsibility of the Operator and Production
Manager and is usually made on a job by job basis. Sometimes the edge finish is paramount
in the final product so all care is taken to ensure this result. On other occasions edged finish
can be sacrificed for the sake of higher productivity. The programmer must be made aware
of these requirements prior to programming the job for the machine.
A reduction in edge finish can generally be attributed wear on the cutting edge of the cutter.
When this becomes apparent the cutter must be replaced to prevent sudden and
unexpected breakage.
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