On Fri, 29 Jan 2010 08:36 -0800, "dave" <[email protected]> wrote: > Hi Aram, > > ER series collets make a good system. ER20 would allow you to go from 1 > mm or so to .500 inch in overlapping collets. I use ER20's on my cinci > and they work just fine. > > ER20's are small enough so you could turn down the shaft just behind the > collet section and use smaller bearings therefore giving you some chance > of increased bearing life.
$51 gets you an ER-20 collet chuck with a 3/4" diameter x 4" long straight shank that is accurately concentric to the collet holder. http://www.maritool.com/Tool-Holders-Straight-Shank-ER20-Straight-Shank/c23_28_176/p337/ER20-3/4-4.0-STRAIGHT-SHANK-COLLET-CHUCK/product_info.html If you can find suitable bearings with 0.750 ID, all you'd need to make is some good spacers to locate them axially (and of course an accurate housing). Of course any system that involves a collet holder integrated in the spindle means that Z won't be repeatable after a tool change. You'll have to touch off each time. Regards, John Kasunich -- John Kasunich [email protected] ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
