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Reply by Mainiac Matt

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Posted on Spoil Board Surfacing Bit

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Mainiac Matt

9232 posts in 2776 days


#1 posted 05-02-2018 08:56 PM

After burning up bits on our first CNC router for years, I finally learned how counter intuitive feeds and speeds are.

Whenever we’d burn up a bit, we’d slow down the feed speed. And cut, re-cut and re-cut every single chip until we made saw dust…. and burned up the bit.

Now we typically run the spindle at max. (well, continuous duty rated max) speed of 18,000 rpm and run the feed as fast as we can and still get an acceptable finish and not shift the part on the vacuum table (typically ~ 700 ipm).

The magic moment happened when an outside tech. showed me how to run with the dust boot up and catch the chips rooster tailing off of the cutter in my hand. The hotter they are in your hand, the more you are removing the heat from the cutting edge.

-- Matt -- I yam what I yam and that's all what I yam


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