Bob, that was a more complete post than I'd ever dreamed. You a machinist?
-- -Josh 2000 Dakota CC 3.9L""DAKSY"" <rsmith13@nycap.rr.com> wrote in message news:000c01c2ee8d$b74a6260$3672c218@nycap.rr.com... > > > Hey, Josh / Andy! > > <snip> To my understanding you are not able to turn slotted/drilled rotors. > Am I > mistaken?<snip> > > Yes, you ARE mistaken. > > <snip> They can be turned. You just have to have the proper tools and > knowledge. Unfortunately I can't find Bob Smith's post about it in the > archives.<snip> > > Stop looking! I'll re-iterate. > > Carbide inserts are well suited for turning just about anything. The insert > will not even notice that it is removing material from an interrupted > surface. Unless PowerSlots are made from tool steel, with a Rockwell C" > Hardness of 60 or greater, which I sincerely doubt, they'd hafta be surface > or rotary ground to remove material. > More likely they are made of a form of cast-iron which is readily > machinable. Should your rotors require .020" material removal to "true" them > up, a 9" dia. (D) cast-iron rotor, with a cutting speed (CS) of 1000 surface > feet per minute (SFPM) & a feed rate of .007 inches per revolution (IPR), > and assuming Pi to be 3.14, the formula is as follows: > > RPM = (CS X12) / (D X Pi) > > = (1000 X 12) / 9 X 3.14) > > = 12000 / 28.26 > > = 421 > > 421 rev/min X .007 in/ rev = 2.85 in/min > > 9" D / 2.85 in/min = 3.14 min (per side) > > So a good lathe man should be able to turn one rotor - both sides - in less > than 20 minutes. The lathe set-up shouldn't take him more than 5-6 minutes > for the first side & about 1/2 that for the 2nd side. > *Whew* > I'm done playing machinist for now... > > Bob Smith (DAKSY2K on AIM) > Averill Park, NY > 2K DAK SY Sport + V6 4X4 5 Speed > > WebPage URL: http://home.nycap.rr.com/daksy/ > > 4 X 1000 = 4000 ipm / 9" = 100 rpm > > 100 rpm X .007 ipr = 7 ipr >
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