On Sunday 08 November 2009, Erik Christiansen wrote: >On Sat, Nov 07, 2009 at 03:52:52PM -0500, Gene Heskett wrote: >> Another thought would be to turn the profile with the flanges, then put >> it on a rotary table mounted 'A' style, and carve the grooves with a ball >> nose mill. The slight radii at the ends where you stop at the flanges >> will probably just wear in both the belt and the pulley without even >> damaging the belt, if the sharp edges are rumbled off as before. > >Now that's thinking outside the box. And if the ball mill is run >part way through the flanges, we won't be chewing that much rubber, >anyway.
I considered that Erik, and thought not, as that would also be leaving some burrs on the flanges that really s/b silky smooth. OTOH, those same few hours in a Lyman Case vibrator would likely fix that right up too, and at far less risk to fingers and uneven cutting than the powered wire brush, I've had that puppy jerk parts out of my hands AND take off some 'spare' skin that wasn't really spare a time or 2. One of the problems with the ball nose in mills of that size is that the flange is going to require a flange plus groove depth projection of the bit from the collet. Which is exactly why I broke the mill I was using yesterday, I had about an inch of 1/8" bit projecting, and that represents a hell of a long lever length should the bit clog up, which of course the 4 fluter did when I didn't get the cutting oil to it fast enough. So I got my billfold slapped. I can afford it, but that isn't really the point. I should have stopped and rigged up the air compressor nozzle to keep the area clean. I don't have a fluid catch pan on this little rig unforch. If someone were to design a table with a drainage groove around the edges, I install it in a heartbeat, along with a coolant pump. I _will_ rig the air flush up before I resume this little project as I think it will get me considerable cleaner cuts. That, and put some drag on the table to control the backlash, even conventional cutting seems to be pulling it on the inward stroke. A second possibility is to run the tooth loop twice, but leave the last 5 thou of metal removal for the 2nd pass. That is doable also. >Erik > -- 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) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> It's hard to tune heavily tuned code. :-) -- Larry Wall in <[email protected]> ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
