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[Router Bits] Selecting the Appropriate Spindle Speed (RPM)

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发表于 2018-3-16 11:11:54 | 显示全部楼层 |阅读模式
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Silence is golden - When you are cutting a new material, it is often difficult to tell what RPM to use. This is especially true of materials like wood that change from batch to batch and thermolastics where there can be significant differences between cast and extruded products. . Luckily, in many cases, the cutting tool will tell you when it is unhappy. Just like a hungry puppy, it will whine and squeal if you are trying to turn it too fast for the material being cut.

Note: Generally speaking, you will not hear ANY squeal from a bit 1/8 in. or smaller in diameter. So, you can pretty much disregard this step if you are using microtools, which are perfectly happy to work at almost any RPM your spindle is capable of turning.

A straight forward method for finding the best maximum SPEED is:

  • Load the tool that you will be testing into your collet and make sure that the nut is properly tightened.
  • Set the SPEED to the highest nodal RPM determined above.
  • Calculate the test FEED by:
    • multiplying the diameter of the bit (D) by 0.02 to determine the CHIP LOAD (2% chip load)
    • multiply the CHIP LOAD by the number of flutes (F) on the cutter you are testing to determine the TOTAL CHIP LOAD
    • multiply the TOTAL CHIP LOAD by the SPEED (RPM) to calculate the TEST FEED
    • In other words:
      TEST FEED = D X 0.02 X F X RPM

      [For example, a good TEST FEED for a 1/4" dia. 2-flute cutter with a SPEED of 12,500 RPM would be:
      0.250 in. X 0.02 X 2 (flutes) X 12,500 RPM = 125 Inches Per Minute (IPM)]
  • Program a 3" or 4" long cut, 1 bit diameter deep using the FEED and SPEED just determined.
  • Run the program.
  • If the bit squeals like a stuck pig, reduce the SPEED and FEED to the second highest nodal point and repeat steps 3 through 6.
  • Continue reducing the SPEED and FEED until the sound from the bit has been minimized. The cutting sound may still be quite loud, but should not be a high-pitched wail. If you cannot find a SPEED where the bit does not squeal, your router/spindle may not have a low enough SPEED range to cut this material with this tool. Switching to a smaller diameter tool may allow you to find a combination that works.
  • Assuming that you find a suitable SPEED, record it in your process log with any other information associated with this tool.

The is the SPEED that you will use in the Sweet spot test used to find the optimum FEED rate.


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