Not true Doug, what happens with those drills in aluminum is that with soft gummy alloys the aluminum chips will stick to the bit and will have to be peeled off. With the TiN coated bits the aluminum will not stick to the coating. But this does not stop you from using the black oxide type. As far as on brass, copper or bronze the black oxide bits are no problem. Bob
*********** If a man speaks in the forest and there is no woman to hear him, IS HE STILL WRONG? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, August 04, 2010 9:44 AM To: [email protected] Subject: Re: [TANKS] Re: drills - black oxide vs titanum tipped I've read that black oxide drills should not be used on non-ferrous metals like aluminum. I don't know if or why this is true. Any insights ? Thanks, Doug ----- Original Message ----- From: "SteveH" <[email protected]> To: "R/C Tank Combat" <[email protected]> Sent: Wednesday, August 4, 2010 12:21:37 PM Subject: [TANKS] Re: drills - black oxide vs titanum tipped On Aug 4, 1:21 am, Ben Holko <[email protected]> wrote: > for a 1/2" hole 3-4mm thick in aluminium any general purpose bit designed for wood/steel will work, just go slow and use some cutting lubricant. > Two other pieces of useful advice: 1) Use a drill press, and clamp the workpiece to the table, if you want accurate hole positioning. Hand-held drilling is right out of it. 2) For large holes, center-punch the location and start with a smaller drill (say, 3/16), and proceed upward in size by increments. Leave the fixturing and clamping in place during this process. You'll get less tool wander by starting with a small drill bit that gets "captured" in the dimple made by the center punch than by starting with a big drill. -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat __________ Information from ESET NOD32 Antivirus, version of virus signature database 5341 (20100804) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 5341 (20100804) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat
