I have read about up cut and down cut router bits on different forums, and have seen photos with different results. I guess they both have their advantages and disadvantages. I just recently bought a down cut bit just because I didn’t have one. Why else?
I was making a 3D carving of a horse about a week or so ago, and my coupling broke and the carving was basically destroyed. So today, I got my machine put back together, and decided to run the cut again. This time however, I decided to try out my brand new 2 flute, 1/4" down cut bit just to see if there was any difference from the 2 flute, 1/4" up cut bit I used the first time.
Holy shit!! What a difference!!! I would never have thought a simple change of the cutting edge design would have such a drastic result.
1st photo was done with an up cut bit. 2nd photo is the down cut. All settings, and wood type (PINE) are the same.
Just to be clear, these are 2 completely separate jobs. Not just one cut twice!!