On Tuesday 29 March 2016 06:56:33 Nicklas Karlsson wrote: > > 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. > > The manual tap holders are adjustable square, there would need to be > two or four moving in opposite direction. Ordinary chuck for drill I > think have three, remove them, machine two new square shaped probably > with a little bit less than 90 degrees to get a good grip and you have > an adjustable square tap holder. I guess it would be good with some > spring or rubber suspension at least in z-axis to reduce forces from > small misalignment within tap, maybe similar as on an axle coupler.
The machine takes care of the z axis. I thought I had found the magic twanger when I'd bought a metric set of small stuff from Dewalt that was actually Irwin/Hansen made. But when I had knocked the T ha\ndle out so I could chuck up the 1/2" diameter butt end of it, I found that I'll have to mount between centers and grind or turn the butt end of it so it runs true. Since the lathe is in the un-insulated shop building with limited heat, that will get done in warmer weather. Obligatory remark about diabetics and cold feet from poor circulation here. It's so poorly forged the runout at the point of a mounted 4mm tap is about 6mm right now. So come warmer weather, fixing it by turning/grinding the rear end of it where the T handle went thru will take some time but might well salvage it for my uses. I think if I can get it true by the time I've reduced it to 7/16ths and put it in an R8, it might serve to run taps from 4-40 to 12-24 & maybe even 6mm. At that diameter, slippage in the R8 shouldn't be a problem. If it is, I'll sacrifice that R8 collet and pin them together. The 0-80 tap I usually run with a 4 jawed double ended pin vice with the top end guided by a stub of a drill bit in the toy mills chuck. that worked quite well but was tedious to do as I had to run the z up & down to get the tap depth I wanted. The broken drill bit was too short. But when all you've got is a hammer... :) > Regards Nicklas Karlsson Thanks Nicklas. 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
