If I could afford it, I would only own Cobalt drills. I use Cobalt drills when I need to make hundreds of holes. Then it makes sense.
But the T coated drills like the Ryobi drills work fine for general drilling on hot rolled and cold rolled. FWIW, Home Depot has put the 1/16 to 1/2" sets on sale for the last two Christmas seasons for less than $20 per set. I grabbed 6 sets on one trip. Gene, your source of hot rolled must be bad. Although I forget how fortunate I am as I am within 50 miles of two large steel mills and several tube mills and two heat treat plants. There is a steel yard about 10 miles from my place that sells slightly out of spec steel tube cheap and they also sell out of spec structural. The tube mill is next door and owned by the yards brother. :-) Dave On 8/12/2016 11:51 PM, Gene Heskett wrote: > On Friday 12 August 2016 21:56:40 N. Christopher Perry wrote: > >> I default to cobalt drills for most jobs. They are more expensive, >> but I've never actually dulled one on anything less than a nasty SS. >> >> N. Christopher Perry > The trick on nasty SS is to center punch a dimple to trap the tip, AND > have 200 lbs of push on the bit before you feel the trigger move. Y > have to make them cut in the first 1/8th turn or you burn up the bit. > The difference is 10 bits per hole, or 50 holes per bit. > > Cheers, Gene Heskett ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. http://sdm.link/zohodev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
