Review on HHIP Draw Boring Shank 1001 0431: Enhance Your Boring Capabilities! by Nick Garrett

I have a grinder with an Erickson QC30 spindle. I have a couple of 3/4 inch collets and this thing wobbles uncontrollably in each of them. At any RPM, feed, length or drill rod geometry, it screeches so loud it could almost replace an AC/DC lead singer. I mean at 75 rpm, 0.001 inch per revolution it screams just as bad as it does at 1000 rpm and 3 ipm. I ended up buying (even cheaper) a reamed NMTB30 shank and sending it in for regrinding of the flange to QC30 spec. Grinding work costs literally 14 times the shank, but I can sink *the same* drill bit with *the same* boring bar in *the same* 6061 aluminum at 1500 rpm with no problem and get a mirror finish at .003-.005 inches per revolution. Stiffness and concentricity play a big part, ladies and gentlemen, and this thing? Not hard enough.