On Wednesday, February 02, 2011 05:23:40 am Steve Blackmore did opine: > On Tue, 1 Feb 2011 16:54:53 -0500, you wrote: > >I have purchased another z casting for my micro-mill, with has a > >nominally 1 and 15/16" bore for the quill to travel in, and have been > >unable to determine if its worth the effort and $140 for a Proxxon > >because even the peddlers who advertise it cannot tell me if the chuck > >is rigidly attached to the motor armature, or runs in its own bearings > >with some sort of a self aligning coupling to the motor shaft. As all > >such tools sold on this side of the pond seem to be. The other > >possibility might be a trim router, but I haven't found one that is > >small yet although the Dewalt comes pretty close. The rotozips, at > >least with their skin on, also look to be too large. > > The Kress spindle is smaller than the Rotozip and pretty good. 240V only > though as far as I know. > > >That leaves sawing off the end of the casting and fabricating a new > >mount. an enticing thought IF I could find (or make) an emc > >controllable gimble mount to allow something like the Proxxon to have > >the motions that Stuarts new toy has. That sort of a capability would > >be better spent building something like Marks machine because I would > >want to carve gunstocks with it. With the gimbled Z axis, I could > >reach into the thumbholes and carve those quite precisely. > > I got a couple of gimbal type mounts, gear driven that were to be > modified and bolted together to allow 5 axis machining, never got round > to it though. They were off ebay from the US and came out of some > satellite dish rotator. They have 24V geared DC motors with encoders and > brakes. One of these days I'll replace the gears with HTD belts to get > rid of the backlash. > > Have a look at these > > http://www.doughtydrive.com/index.html > No prices though, SWAG? > Easy enough to make a similar design using htd belts and pulleys.
However, using toothed belts & pulleys, 30/1 to get the torque will be a 2 step reduction. And that will likely bulk up too much. > > Steve Blackmore -- 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> A wise man can see more from a mountain top than a fool can from the bottom of a well. ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
