On Sunday 03 November 2013 18:39:01 Dave Cole did opine: > Spiral point taps are made for through hole tapping.. they tend to push > the chips ahead of the tap. Not good for a blind hole. > > http://www.shars.com/product_categories/view/2160902/HSS_Spiral_Point_Ta > psPlug_Style > > Spiral flute taps work well for blind holes. > http://www.grainger.com/Grainger/WIDIA-GTD-Spiral-Flute-Tap-1TRK6?Pid=se > arch > http://www.shars.com/product_categories/view/807222403/HSS_HiSpiral_Flu > te_Tap_USA > > Not cheap though... > > Dave
Depends. These links are all to HSS, and shars seems pretty reasonable, under $3 ea in the sizes I might use. Beat ACE Hdwe by a bunch & probably better stuff. Thanks. I am bookmarking all this so thank you all. > > On 11/3/2013 2:54 PM, Jon Elson wrote: > > Gene Heskett wrote: > >> Now if someone knows where I can buy an 8-32 tap that can tap an 8-32 > >> blind hole pre-drilled .250" deeper than the needed threads, tapped > >> as deep as the tap is long and do it repeatedly for a dozen holes > >> before I am rigging to EDM its broken pieces out of the hole, I am > >> all ears. And it may have to do it in a piece of tool steel right > >> out of the paper sleeve. > > > > I buy 5 or so at a time from MSC, J&L, KBC and similar outfits. > > For shallow holes or thin sheet material, I use spiral FLUTE taps, > > they bring the chips up the hole just like a twist drill. Fantastic! > > But, on deep holes, they will bind up with chips and break sometimes. > > So, for those I often use spiral point taps. I did a fixture plate in > > 3/8" aluminum with 288 10-32 holes in one setup, with rigid tapping. > > The tap is still about as sharp as when new! > > > > Jon > > > > ---------------------------------------------------------------------- > > -------- Android is increasing in popularity, but the open development > > platform that developers love is also attractive to malware creators. > > Download this white paper to learn more about secure code signing > > practices that can help keep Android apps secure. > > http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.c > > lktrk _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------ > ------ Android is increasing in popularity, but the open development > platform that developers love is also attractive to malware creators. > Download this white paper to learn more about secure code signing > practices that can help keep Android apps secure. > http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clk > trk _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Editing is a rewording activity. A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
