Gene, If you are machine tapping, you really need machine taps, in either a spiral point, or spiral flute design.
I quit buying store bought taps a long time ago. Now, I mostly buy OSG branded taps, which are Japanese made. I have also been told that Hertel and Guhring, which are American made, are good taps as well. I have been power tapping with them in my manual mill and my manual lathe, with no issues. To go with those taps, you also need a high quality drill bit. The best tap in the world won't make good threads, if you use a bad drill bit. Since Bowman is no longer in business, and I cannot buy bowmalloy bits anymore, I have been using the Triumph Thunderbit series of drill bits, which are made by Minnesota Twist Drill Co. These are a couple of items that I bought last week: http://www.mscdirect.com/product/details/64943830 http://www.mscdirect.com/product/details/00648014 And now the obligatory release statement: I do not work, or profit from these companies in any way, I'm just a happy customer. I am in no way tied to using these Items, so if anybody has a suggestion for high quality tools at a better price, I'm willing to listen. On 11/13/2016 03:34 AM, Gene Heskett wrote: > Not knowing the internal workings as you do, I was somewhat concerned > that there might be enough of a phase angle difference between > directions to loosen a thread, particularly when running the g33.1 in a > peck loop, giving me a chance to clean and anoint the tap during the > pause I put into the loop just for that purpose. I think some of my > loose threads are because the tap isn't straight. And I keep forgetting > to order a couple 3mm from some other than dewalt/irwin because both of > the $30 ea tap & matching drill kits I've bought have crooked taps, by > about a 20 to 30 thou wobble. Z backlash setting accuracy should count > for that too. As would a loose z nut holder. I have those bolts "tighter > than a bulls ass in flytime" as an old Nebraska farmer was fond of > saying, but I've had to pull the head off and put some more muscle yet > into those bolts twice now. I am not the least impressed by that design > at all. The foot print is way too narrow in the direction of the travel, > and the bolts are arranged horizontally, so its a piece of cake to work > them loose. > > Thanks and Cheers Jon, Gene Heskett -- MC Cason Eagle3D - Created by Matthias Weißer github.com/mcason/Eagle3D ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
