If you swap the X and Y drivers it will be fairly easy to determine whether the problem is with the driver (as Gene suspects) or with friction or mechanical linkages (as Jan suspects). If the problem stays on Y after swapping drivers, then your driver is absolved, leaving only mechanical or step signal generation problems as possibilities. You can distinguish between these last two by only swapping the control leads between drivers while leaving the motor leads hooked up as they are now.
Rogge >If it looses position I would say too little or too much friction in the >movement and the steppers jump position. On Fri, Jul 15, 2011 at 8:14 AM, Andy Howell <[email protected]> wrote: > Hello, > > I purchased a used Sieg X2 mill. The previous owner retrofitted it > for CNC using the > plans from Hossmachine. > > Its using a Gekko 540 to drive the steppers. > > I've been having problems with it a low feed rates. I was attempting to do > a pocketing > operation to create a 0.6 inch hole with a 1/4 end mill. Each pass ended up > offset from > the previous one. > > Not understanding what was happening, I substituted a pen for the end mill, > removed the Z > axis movement, and drew the following image at different feed rates: > > http://i52.tinypic.com/28ba821.jpg > > At F20, it looks pretty good. The center is cleared out, followed by the > outer portion. > The slower the rate, the greater the positioning error. > > Any idea what might wrong? > > Thanks, > > Andy > > ------------------------------------------------------------------------------ AppSumo Presents a FREE Video for the SourceForge Community by Eric Ries, the creator of the Lean Startup Methodology on "Lean Startup Secrets Revealed." This video shows you how to validate your ideas, optimize your ideas and identify your business strategy. http://p.sf.net/sfu/appsumosfdev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
