On Thu, 2013-08-01 at 16:51 -0700, Kirk Wallace wrote: > On 08/01/2013 04:02 PM, Gregg Eshelman wrote: > > Finally have the old Acra mill home where I can have a look at the system > > and see what it has and what it needs. > > > > The Z axis has a Baldor (Anilam labled) FMD0000B-00 and the Y axis has a > > Miltronics (also Anilam labled) MT30M4-5. There's no X axis motor but I > > assume it would have been the same as the Y axis. > ... snip > > I would tend to look at a 90 VDC brushed treadmill motor and refit it > with better bearings and custom end housings. > > Using the glass scales can present tuning problems, even with low > backlash, let alone with single nut ball screws or a worn machine. A > good set up would be to use the scales for positional feedback, then fit > rotary encoders to the motors for velocity feedback. > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Combining_Two_Feedback_Devices_On_One_Axis > > Otherwise, I'm partial to fitting just a rotary encoder to the ball > screw with a belt to the motor, which is a compromise between positional > and motor motion feedback.
If those anilam scales work then the best of both worlds is to use the encoder on the ball screw or the servo shaft for PD and connect the linear scale to I like was done on some of Stuarts stuff. YMMV ;-) Dave ------------------------------------------------------------------------------ Get your SQL database under version control now! Version control is standard for application code, but databases havent caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out. http://pubads.g.doubleclick.net/gampad/clk?id=49501711&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
