1. When is it time to have a tool re-sharpened? When the cutting edge becomes dull. Some things to look for are: surface finish quality will decrease; the amount of horsepower necessary to cut will increase; and the noise level may increase.
2. What is the major cause of tools becoming dull? Heat is the major reason tools break down and become dull. To reduce the amount of heat, increase the chipload or reduce the RPM. This will keep the heat in the chip and remove it from the part. After a cut, the tool should be cool to the touch.
3. What should be kept in mind with regards to feed and speed? When fine-tuning a CNC router, start at the low end of the feedrate recommendation. Use the feedrate override to increase feed rate until:
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