Gene, For a test on the cheap, you can usually fet one of these for ~$25.00 with a coupon. Check the collet in the store for runout before you buy. I have two and they are my "router". The aluminum snout makes for ridgid mounting and a 1/4 X 1/8 collet adapter allows me to accurately hold the 1/8" endmills I use. The motor cooling air also is not directed at the work surface so I do not get dust everywhere. This also makes a shop vac a very effective dust collection tool.
http://www.harborfreight.com/power-tools/grinders/electric-die-grinder-with-long-shaft-44141.html Yeah Yeah.... its HF, but if it breaks, I am only out a few bucks. I have toyed with splitting it and running the spindle off a belt reduction to get the slower speeds. Too many house projects must be done before I attempt that. On Wed, Feb 2, 2011 at 7:14 AM, Viesturs Lācis <viesturs.la...@gmail.com>wrote: > 2011/2/2 Erik Christiansen <dva...@internode.on.net>: > > On Wed, Feb 02, 2011 at 05:35:14AM -0500, gene heskett wrote: > >> On Wednesday, February 02, 2011 05:23:40 am Steve Blackmore did opine: > >> > >> > 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. > > > > I've often wondered what a two-step htd belt reduction does to backlash? > > > > When belts are tightened well, then I think it is good from backlash > point of view. The main question, just like Gene pointed, is designing > it to be compact, not a large and bulky box. > 30:1 ratio might require even more than 2 stages - one would need to > combine 6:1 and 5:1 ratios to get it in 2 stages, but that involves > very high differences in pulley sizes, so for compact design only very > few teeth will be in contact on small pulley. > But in the mill head the belt will have to deal all the forces between > endmill bit and material, that is why I think that just several teeth > in contact between belt and pulley might lead to short lifetime of the > belt. > > Viesturs > > > ------------------------------------------------------------------------------ > 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 > ------------------------------------------------------------------------------ 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
