Quote:
Originally posted by EMC2
JD - have you ever seen a bit that you could create a knurled type surface on wb passages?  Regarding the bit you found - an important piece of info : you do not want to create any surface channels that are parallel to the flow as this will contribute to a laminar flow along the walls.
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You are right and that was the bit I was thinking of as the channels would run in the same direction and that wouldn't help to much.
I also am going to try this one end mill that will make the botom of the channel groooved instead of flat. So instead of a 90 degree angle from the bottom of the channel to the side of the channel it will be U shapped. And then I was thinking about taking my 1/8" end mill and making the side walls bumpy. I will run the end mill into the side walls about every 1/4".