Feed Rates for Plastics

DSC_0615“Feed rate” refers to the speed at which material is being “fed” through the machine. It is generally measured in inches per minute or meters per minute, depending on whether the Imperial or metric system is used. The Feed rate is part of the formula used to calculate chip load (size of the chip created in the cutting process). The other parts of the formula are motor speed on the router (rpm) which dictates how many revolutions per minute the tool is turning, and the number of flutes (wings) on the tool. To calculate chipload the formula is Feedrate / (RPM x number of flutes). The most common problem, in regard to incorrect chipload is premature tool wear, tool breakage, most often due to excessive heat buildup and poor material finish/chipping.

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Typical chip load range for Plastic Materials

Hard Plastics .004-.016″
Soft Plastics .006-.014″

The smaller the tool diameter, the lower the chip load that applies, will be.

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