Choosing The Right Drill Bits And Router Bits
After choosing the right drill bits or router bits for any type of machining job, the correct chip load for the tools selected becomes the next major concern. The chip load for upcut wood router bits will be vastly different than it will be for a tool used with mechanical plastics, though, so the chip load range must be considered in regards to the materials. For plastic routing, the recommended chip load range is 0.004 to 0.012 IPT, which results in an excellent finish and acceptable productivity rates.
When working with metal, wood or composite material, however, it will be different. Router bits are most commonly used in industrial settings with CNC milling machines, which use a computer controller that reads G-code instructions and drives a machine tool, a powered mechanical device typically used to fabricate components removing material. These machines can work with upcut wood router bits, metal drill bits, and a variety of other tools for a variety of different materials. Spindle speeds of 10,000 RPM and higher, with feed rates in excess of 600 IPM, are not uncommon with these machines.
Machines for plastic machining, however, can perform at spindle speeds of 6,000 RPM and proportionately higher feed rates when other tools are not available, if the proper chip load is maintained. The accuracy of CNC milling machines enhances the geometry of router bits, along with hard fixturing with mechanical or pneumatic clamping devices enhance the effectiveness. Now plastic machining can be completed with high quality in a short period of time, which is increasingly important because mechanical plastics are becoming more prevalent than metal and other materials for machining parts. Use of mechanical plastics by shops will continue to grow, because of the shorter cycle times and improved part quality. Router bits and drill bits designed for machining mechanical plastics provide such an opportunity.
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