I have had a crazy busy week, and haven't had a chance to play machinist very much. I did come home last night from the factory where I've been consulting for a couple of weeks, and got a good start on the tappets. I figure that if I have to set the rotary table up on the mill to do the cam anyways, I might as well cut the hex shapes on the tappets, which are being made from 1/2" 01 drill-rod. I hope to get the cams done this weekend as well. You are probably right about the shape of the cams not being all that critical. They are very "not critical" if using a follower wheel on the tappet, but for a flat bottomed tappet, if you don't get the curve right on the cam flank, they will 'slap' the bottom of the tappet on every revolution.----At least that's what the books say.-----Brian