On Friday 15 July 2016 15:59:20 Gene Heskett wrote: > Greetings all; > > I bought, from a British vendor, a set of small internal and external > single tooth tapping tools. The tooth on each looks as if it would be > well buried cutting a 16 to 18 tpi thread to something resembling full > depth. The internal bar has flats on 3 sides so it cannot be rotated > in a std QC holder, but the cutting chip itself is mounted, and the > end of the tool matches it, such that it is tipped down in front > toward thge x axis, guessing 5 to 8 degrees. So I am wondering if the > cutting tip needs to be adjusted a few thou above or below the > centerline. My gut thought is to jack it up a few thou until the > cutting edge itself is on the centerline as this will give additional > clearance under the cutting edge in a smallish hole. > > Other ideas? > > Thanks guys, I'll go set it that way & waste a chip I guess. But I'll > also check back in occasionally for advice. > > Thanks all. > I mounted, and checked for working clearance & found I was close to a mm of not having enough for a full thread height retraction at the bottom of the taper. That, and I'm not sure I have the advancement angle correct. Not worth wasting a $30 chip to find out. So I am contemplating mounting a diamond disk, putting a cheap small boring bar in the chuck on my rotary, and grinding a single toother on the end of a $3 boring bar. I have done that before, 4 or 6 years ago. Holding a dremel by hand yet. PIMA is what that was since the carbide in those cheap tools shatters like herculite rear windows on a hot July day in Yuma AZ at the first hint of a chatter. . > Cheers, Gene Heskett
Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
