On Fri, 2011-02-18 at 00:23 -0500, Przemek Klosowski wrote: > On Thu, Feb 17, 2011 at 4:43 PM, dave <[email protected]> wrote: > > > > > In all this fuss over how to machine tap no one has mentioned thread > > forming. The few times I've tried it by hand it has worked well. > > > > True, but one has to be very careful with threadforming if thread strength > is important: > > > http://machinedesign.com/article/internal-thread-strip-out-tests-yield-surprising-results-0113?page=0%2C0 > > shows that thread strength is critically dependent on hole diameter when > threadforming, much more so than for regular threading
Good point! It simply emphasizes the need to be careful in sizing the hole. Than again .02 oversize in a .6 hole is a lot of overcut. I would hope that correctly done thread forming is stronger than cut threads when properly done but it might be interesting to test in the size one uses most. For me that is .25" in 1020 CD or 6xxx or 7xxx Al. Thanks for posting the reference. Dave--------------o./;;;;; .. opps the CAT is helping type. ;-) > ------------------------------------------------------------------------------ > The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: > Pinpoint memory and threading errors before they happen. > Find and fix more than 250 security defects in the development cycle. > Locate bottlenecks in serial and parallel code that limit performance. > http://p.sf.net/sfu/intel-dev2devfeb > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: Pinpoint memory and threading errors before they happen. Find and fix more than 250 security defects in the development cycle. Locate bottlenecks in serial and parallel code that limit performance. http://p.sf.net/sfu/intel-dev2devfeb _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
