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milling aluminium

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Hi , i am new to cnc work well i am in the non ferrous type . Down a cnc router of which i use daily for the furniture i build . I am wanting to make some name tags out of aluminium engraved with a 1mm bullnose cutter then cut out with a single flute bit . I tried today but with the ball nose bit i got a lot of burrs left on the edges . The aluminium is 2mm thick and i only need to engrave to .75mm . could you give me any information on how to get a perfect finish please my max rpm is 24000rpm

many thanks in advance

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Richard, those burrs could be from a lot of sources.  My first inclination is to suggest the following:

 

  • Make sure the chips are being cleared by vacuum, compressed air, or liquid coolant.
  • Make sure you are using some form of lubricant in the cut–aluminum likes to stick to the cutter.
  • Use G-Wizard to calculate your feeds and speeds and turn the Tortoise-Hare slider to “Full Tortoise” for best finish.

Best,

BW

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