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. At wood routing speeds bearings are not going to have long life anyway. Keeping the diameter small helps. You might want to pick up some of the Koyo bearing literature at your local McGuire Bearing store ( 943 Southeast Market Street, Portland ). It contains useful stuff on spindle bearing designs. If you want something 'quick and 'dirty" 2 HP Hitachi routers are available with 0.25 and .5 collets for just over $100. I have one mounted below the spindle on my Mazak and it is giving good service but I don't expect long life out of the bearings. Being the experimental type you might check out hydrostatic bearings using water as the lube. A real pain to fabricate but I think the bearing life might make up for it. Maybe someone with experience will post. Good luck with your endeavor. Dave On Fri, 2010-01-29 at 11:14 -0500, Cal Grandy wrote: > I recently purchased a Lyndex ER25 stub spindle (ebay) for < $20. Collets > are about the same each. > > > They are out there...... > > Cal > ----- Original Message ----- > From: "Kirk Wallace" <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Sent: Friday, January 29, 2010 11:06 > Subject: Re: [Emc-users] home made spindle > > > > On Fri, 2010-01-29 at 09:59 -0500, Chris Barker wrote: > >> [email protected] wrote: > >> > Hello > >> > I want to ask about “home made spindle” belt drive. > >> > I look and found spindle with CAT 30 made in China but also in China > >> > for $ > > ... snip > >> Have you considered a DA collet chuck as an arbor? > >> http://www.use-enco.com/CGI/INPDFF?PMPAGE=479&PMCTLG=00 > > > > Rumor has it that the double-angle collet system is not nearly as > > accurate as an ER system. > > http://www.use-enco.com/CGI/INPDFF?PMPAGE=480&PMCTLG=00 > > > > For new designs I would tend to go with ER, but I have no first hand > > experience with this. > > > > CAT 30 would be better, because you can use it with an automatic > > changer. When I get time, I plan to make a CAT 30 spindle for my > > Bridgeport. The whole head (motor, two speed belt drive, encoder, > > spindle; no gear box or quill drive) will be on a slide (or rigid and > > use the knee for Z), like on a bed mill, instead of a quill. > > > > -- > > Kirk Wallace > > http://www.wallacecompany.com/machine_shop/ > > http://www.wallacecompany.com/E45/index.html > > California, USA > > > > > > ------------------------------------------------------------------------------ > > 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 > > > > > ------------------------------------------------------------------------------ > 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 ------------------------------------------------------------------------------ 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
