On Monday 04 November 2013 09:43:24 John Thornton did opine: > I use OSG taps coated with electraLUBE. What I meant by looking at the > tap was after you use it and before you use it again. For a blind hole > you want a spiral flute bottoming tap. Are you reaming the hole to final > size before tapping?
Not generally, tending to search my drills with a mic in hand, looking for something that will give me the book to maybe 2 or 3% more thread than the book says. Hard on taps if I miss a couple thou small because that drill is sharpened dead center & doesn't drill 3 or 4 thou oversize. Then the pecking gets real... Toss in that the drill doctor isn't that accurate below 1/4" drills and it can get interesting, or expensive. Hell, I'd pay another $200 for a Drill Doctor that could do a 1/16" bit RIGHT. But that beast isn't made, the drill bits, sloppy as they are, are too cheap to be a target for the DD. Dammit. > I get my taps from MSC. > > http://www.mscdirect.com/browse/?navid=4294951007+12106033+4288244499+42 > 88247981+4288247983&searchterm=OSG > > I do buy a lot from McMaster Carr... but not taps. > Under a $20 bill for that isn't that bad. Thanks John. > JT > > On 11/3/2013 12:27 PM, Gene Heskett wrote: > > On Sunday 03 November 2013 12:58:44 John Thornton did opine: > >> You only peck tap when doing it by hand. When you machine tap you > >> always go all the way in and back out. It is wise to use good > >> quality taps and inspect the first few cutting edges with a strong > >> glass before use to look for signs of wear like cupping. > >> > >> JT > > > > I can appreciate that John, but my excuse is that I am at least 200 > > miles from anyplace I can buy a 'quality' tap that I can eyeball for > > edge etc before I drop the card for a 10 pack, one thats strong > > enough to do that. > > > > So my local tap suppliers all stock the cheapest they can get, crap > > aimed for the beginner hobby market. Today's Hansen is a piece of > > crap made from cast iron, anything with a black nitride coating will > > be both the wrong size and not sharp enough to seriously damage a > > stick of margarine. So I use what I can get that looks sharp, which > > is usually the nitrided Mibro. But while they seem to be hard enough, > > and sharp enough, and are generally the right size, the chip gulleys > > are too shallow and it will be chip bound in 2 turns. So I am forced > > to peck regardless of how its being driven, blowing it clean on the > > backout & if theres enough pause, a drop of cutting oil. > > > > 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. > > > >> On 11/2/2013 3:50 PM, Gene Heskett wrote: > >>> However, this doesn't answer the question about anyone else having > >>> written a "peck cycle" using the G33.1 routine and had it work > >>> perfectly, or if they too had encountered a duck that walks & quacks > >>> like this one. Thanks Gregg. Cheers, Gene > > > > Thanks John. > > > > Cheers, Gene > > ------------------------------------------------------------------------ > ------ 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 > Emc-users@lists.sourceforge.net > 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) You have all eternity to be cautious in when you're dead. -- Lois Platford 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
