On Thu, 2011-03-03 at 14:48 -0600, Igor Chudov wrote: > 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?
The W has a glass scale at .2 thou resolution and it was settling to that. I suspect I just worked it too hard as I was not just using it to adjust for tool length but for contouring. That was a lot of years ago and I didn't do much checking on drive as long as it appeared to work. Dave > > 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 ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
