On Thu, Mar 3, 2011 at 2:40 PM, dave <dengv...@charter.net> wrote: > On Wed, 2011-03-02 at 21:41 -0600, Igor Chudov wrote: > > > I really think it is a bad idea, as the position will be uncontrolled > > > when not moving. > > > > Jon, this is a ACME type screw that moves the knee, not a ballscrew. It > is > > 100% self locking. > > But that is exactly why it takes more power to turn. IIRC acme's are > about 10% efficient whereas ball screws are in the range of 90%. > > Yep
> Some years ago I put a servo on the W of my cinci contourmaster. A > gearhead motor with additional 3:1 timing belt. Max speed was about 10 > ipm; no pneumatic boost. Motor was probably 300 W. Even then it finally > smoked. Even at 10 ipm I could do contouring. I had no drive on the Z at > the time so this had to do. ;-) > Sometime I may get around to driving the z again to comp for tool length > since I have less than 3" on the quill. The plan will be to use an > adequate gear ratio to do the job, even if slowly since it is supposed > to do tool length not contouring. > > Do you remember, did you smoke the motor due to too much moving, or due to the motor straining when W was not supposed to move? If the latter, then Andy's timeout comp should do the trick. i ------------------------------------------------------------------------------ Free Software Download: Index, Search & Analyze Logs and other IT data in Real-Time with Splunk. Collect, index and harness all the fast moving IT data generated by your applications, servers and devices whether physical, virtual or in the cloud. Deliver compliance at lower cost and gain new business insights. http://p.sf.net/sfu/splunk-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
