Why buy a fan cover for a few pennies when you can spend hours and hours designing and cutting one at home? The cover is approximately 8.5 x 4.5" made from 1/4" aluminum using 1/2" and 1/8" endmills. The pocketing took a lot longer than I expected but I was only taking 1/16" deep cuts with the 1/8" end mill. A 3/16 end mill could have been used for the pockets except for the flats at the bottom of the outer circles.
Tried out a Noga mister with Kool Mist - been really pretty happy with it especially when contouring with 1/2 end mills - the chips are insanely hot but the end mill finishes cold.
I would be really interesting to hear how long others think this should take. It took me 4 hrs though I ran the 1/8 end mill a little slow (3-4ipm) and shallow (1/16") (only going to make one of these and did not want to break the end mill in the middle). Seems like 2hrs should be doable. This was the first part that I turned the lights off and walked away.
BTW: Are the members of this forum interested in seeing what others are making with their IH mills? I don't want to make noise in the forum if there is no interest.