On Thursday 29 October 2015 19:20:13 rayj wrote: > Greetings, > > My little 3 in 1 machine has a hollow quill for using a draw bar to > pull the MT 3 mail holder into place. I was wondering if anyone had > used vacuum to snap the holder into place, and if it is likely to be > tight enough for a little light milling. > > Just kind of wondering out loud. If it's been tried and failed, I > won't have to wonder any more! :>) > > TIA > > Raymond Julian > Kettle River, MN
Vacuum, likely nowhere near enough unless the piston has many square inches of surface to pull on. The max differential pressure is just over 14 lbs per square inch. My toy mill has MT-3 collets for tool holders, and I have to get fairly serious on a 14mm wrench to pull it tight enough the tool won't walk, usually out. :( Air pressure, pushing on the underside of the piston would allow a smaller piston, but with MT-3, would still need a ton+ of push, and 3 or 4 tons to press down and eject. Hell on spindle bearings, but I've been ejecting MT-3 collets with a 24 oz hammer applied hard enough its peening the top of the bolt and I've had to grind that "upset" back off the top of the hex (or square, I have two bolts, one Metric & one 'Merican, to make the socket fit about 4 times now. 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> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
