What you need to figure out is how far the axis moves per rotation. For example if your motor turns 4 times to turn the big pulley once and the table travels 2 inches then it is 2 turns per inch. If it is 200 pulses per revolution and 10 microsteps then you have 200 x 10 x 2 steps per inch. At the bottom of the page you can see the scale calculate as you enter in values. The only value that really matters is the actual scale number.
I have belt drive plasma cutter and the calculations don't quite come out exact with the belt. It depends on how much belt stretch you have. Once you get it close take a measurement and the move a large amount then measure. Do the math to figure out the exact scale you need to get a movement of one unit. For example one of my axis calculated scale is 4000 but because of belt stretch I need 3980 to get a more accurate movement. John On 10 Nov 2009 at 13:08, Jeshua Lacock wrote: > > Greetings, > > I am trying to calibrate my shiny new machine. I have opted to use > timing belts instead of leadscrews. > > My servos have 512-count optical encoders driven by Gecko 320's. I > have all the pins set up, and are working nicely! > > The servos are geared down 4 to 1 (four servo revolutions per pulley > revolution that runs main timing belt). > > My question is, what would I put for the "Leadscrew pitch" in the > Axis > Configuration Page? I assume for the "Pulley Teeth" I would enter > 4:1. > > I greatly appreciate any advice! > > In case anyone is interested, pics of the machine are at: > > <http://OpenOSX.com/CNC-11.9.09/> > > > Cheers, > > Jeshua Lacock > Founder/Programmer > 3DTOPO Incorporated > <http://3DTOPO.com> > Phone: 208.462.4171 > > > -------------------------------------------------------------------- > ---------- > 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 > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
