Downcut sometimes really loud?

How To Machining
8

OK so I’m sorry / happy to report that this ultimately was user error. The chain of events is something like the following:

  1. Decide to buy the downcut bit. BTW it is a Whiteside RD2100
  2. Try out using it with my same feeds and speeds as my upcut bit and hear the awful screaching sound
  3. Find @Julien 's reply to another thread
  4. Adjust my depth and feeds and speeds to be much more conservative as a new tool in Fusion
  5. Use the new F&S for my first side but forget to apply it for the second side

When I looked at my second side in Fusion it was still set to the upcut bit. Whoops…

For future posterity, a decent F&S for slotting seemed to be something like 18000RPM, 107 in/min with 0.25in WOC and 0.048in DOC. Apparently these settings should only be 50% of the max machine force (18lbf) and 55% of the max power available (800W spindle). Of course, the calculation doesn’t consider downcut vs upcut bit.

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