On Tuesday, March 15, 2011 09:49:41 AM andy pugh did opine: > On 15 March 2011 04:32, gene heskett <[email protected]> wrote: > > I knocked that elderly B&D apart tonight, far enough to see that it > > only needs the bearing on the chuck end of the shaft, but the collet > > is really a trashy collet, so if I follow that idea, I may as well > > start by making my own shaft to take a decent MT2 collet as I have > > those. > > Do what that chap Edward's link seems to have done, use an ER11 > extension spindle as your basis: > http://cgi.ebay.com/ER11-8MM-STRAIGHT-SHANK-CHUCK-CNC-MILLING-LATHE-D66- > /150573752140 or 16mm dia, but needing a snap-ring groove or something > http://cgi.ebay.com/New-C16-Er11-150L-Milling-Straight-Shank-Holder-US-/ > 110452460881 ER11 goes up to 17/64". > Then use the water pipe as you originally intended, with some $5 > angular contact bearings to suit. (8mm and 20mm are easy, 16mm would > need sleeving up or machining down, as there are no 16mm ID angular > contact or taper-roller bearings. > > My hobbing axis uses the same idea, but with an ER32 holder and taper > roller bearings.
Just to see if this idea is workable, and who knows, if a decent runtime life can be had, I bought one of those $30 Chicago Tools die grinders from HF last night. And for runtime extension, I have a speed controller I use with a PC router in my router table that could slow it down to just a few thou, still fast enough given what I seem to be able to do at 2500 revs in the mills own spindle, those mortises look sweet. Solid carbide router bits seem to be _very_ sharp, unlike the chip inlayed versions. Those absolutely must have the faces kissed and polished with a diamond wheel else they just burn their way through cherry. In the meantime while its on a truck, I can get the jig to hold the stick over the edge of the table made, and get an alu bar about 3" wide, an inch thick, and about 10" long sawed out and faced flat. I will drill & tap the front of the spindle housing for about 4, 1/4" bolts so as to attach that to the face of the z sled, so it extends to the left about 8". Then when that grinder gets here so I can get some measurements off its extended nose, find some u-bolts & drill for those. But because its a 30 dollar tool, expecting the nose piece to actually be in line with the shaft is probably asking too much, so I'll probably have to plow a groove to lay it in that might even be tapered from top to bottom. I have some .250" drill rod that might serve to extended the shaft line so I can measure the housings wibbles once the shaft is made true to the tables x axis. This should keep me out of the bars for a few days. ;-) -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) <http://tinyurl.com/ddg5bz> <http://www.cantrip.org/gatto.html> It is through symbols that man consciously or unconsciously lives, works and has his being. -- Thomas Carlyle ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
