On Tuesday 29 March 2016 06:22:47 Kenneth Lerman wrote: > My Tapmatic tapping heads seem to hold taps just fine. If I recall > correctly (I'll look in the shop later), they have two mechanisms: > 1 -- A vise like mechanism that closes on the flat sides of the square > -- that provides the driving power > 2 -- A rubber flex collet -- that provides the alignment > > Since it is designed to be used in a drill press, the Tapmatic also > has a mechanism with "slop" so that the tap can self align with the > hole. > > Ken
Can that have the handles removed so it could be chucked in a milling machines spindle? It seems to me somone should design a similar device for people using G33.1 to tap a hole. Or, if someone does make such, my google-fu can't find it. Jon: How are you holding taps in your Bridgeport? > On Tue, Mar 29, 2016 at 4:40 AM, Gene Heskett <ghesk...@wdtv.com> wrote: > > On Tuesday 29 March 2016 03:25:55 Neil Whelchel wrote: > > > Hello everyone, > > > Thank you very much for your comments and suggestions. To me the > > > tap is not the issue, a broken tap in a hole IS an issue, so it is > > > all about not breaking the tap if the spindle faults out. As long > > > as the axis stays slaved to the spindle, the tap can be removed by > > > hand. There is not much point of restarting on the same hole, as > > > that one can be completed by hand tap if needed. However, having > > > just said that, I have found that since the axis slave operation > > > starts on the index mark of the spindle encoder, I can actually > > > tap a hole again, and with quite impressive results. I will look > > > at motion.feed-inhibit, it looks promising. The docs say that it > > > allows synchronized motion to complete, but it is unclear if it > > > will work in the case of manually backing a tap out of a hole. I > > > will report my findings. Thank you, -Neil- > > > > I agree with 90% of that. Restarting the operation here at the > > WOWElectronics shop has generally not been practical because the tap > > has slipped in the chuck, or the whole chuck holding the tap has > > turned in the boring bar type holder I use to hold taps on the > > carriage of my toy lathe. I lack the ability in a tap holder to > > grab the square rear end of the tap in a tool holder and positively > > prevent its moving. If I had that problem solved, and I drive the > > tap to the starting position in my G33.1 wrapper, then a rehoming of > > the lathe should put it close enough to restart the hole if the > > spindle faults because the tap is bigger than the spindle can do w/o > > bogging down. Editing the wrapper for a smaller peck so it doesn't > > trip off again of course. > > > > Much the same problem exists on the G0704 as there is not a > > precision way to hold the tap there short of welding it into a tool > > holder, which would of coarse anneal the tap into some about as > > strong as a peep. > > > > I broke a 3mm.5 tap the other day because that POS chuck that came > > with the g0704, with its taper mount, had so much runout it forced > > the tap sideways and snapped it off. I measured the tapered > > section, finding the taper had a runnout of about 3 thou, but so did > > the chucks rear socket, so by knocking its adapter out, turning it a > > bit and driving it back in, I finally arrived at about 2 thou of > > runnout on a 6" piece of 1/2" A2 drill rod, and it seemed to be > > repeatable, the R8 it was being held in was pretty true. > > > > Pretty good considering my first measurement of that runout was in > > the 55 thou range immediately after I broke the tap. Measured on > > the remains of the tap stickout. I was by myself and the shop air > > was pretty blue for a while. > > > > I have searched the net, but have largely come up empty when looking > > for a tap holder that actually grabs the square on the butt of the > > tap. If I was a tool maker trying to design such a beast, I would > > first try to convince the tap makes to standardize the square. I > > have close to 60 taps sourced from various places, and I don't think > > I have 2 taps that are close enough to the same size that a machined > > holder could hold both. > > > > Tap holding, precisely and repeatably is a problem I would love to > > solve. > > > > Thanks folks. > > > > Cheers, Gene Heskett > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author) > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > -------------------------------------------------------------------- > >---------- Transform Data into Opportunity. > > Accelerate data analysis in your applications with > > Intel Data Analytics Acceleration Library. > > Click to learn more. > > http://pubads.g.doubleclick.net/gampad/clk?id=278785471&iu=/4140 > > _______________________________________________ > > Emc-developers mailing list > > Emc-developers@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-developers Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785471&iu=/4140 _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
