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?
I get my taps from MSC. http://www.mscdirect.com/browse/?navid=4294951007+12106033+4288244499+4288247981+4288247983&searchterm=OSG I do buy a lot from McMaster Carr... but not taps. 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.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
