On 12/9/2013 6:38 AM, Charles Steinkuehler wrote: > Yes, "Leveling" the bed on the Simpson is easy...what I expect will be > hard is getting the plane of the physical bed to exactly match up with > the XY plane of the arm movement. I have yet to see how well the homing > switches will work for Simpson, but the linear-delta machines generally > do a Z depth probe across the bed, and use that to compensate (in > addition to the usual homing switches).
A simple way is a Z probe, just like is used on CNC milling machines. The probe is a known thickness, set on the table or workpiece. The Z axis is slowly run down until it touches the probe. Then the Z zero is set to the current position + the probe thickness. For a conductive table or workpiece, the probe must have an insulating layer on its bottom. For non-conductive surfaces the probe is simply a piece of metal with a wire leading to an input on the control system. Touching the conductive tool to the probe closes the sensing circuit. Since the 3D printer nozzles are metal, the same system will work. Leveling the Simpson bed could be done by using the probe at each of the three corners to find the highest, then zeroing there. Next, move to the other corners, run the nozzle down to zero minus the probe thickness. Place the probe on the bed then adjust the bed up until the probe contacts the nozzle. ------------------------------------------------------------------------------ Sponsored by Intel(R) XDK Develop, test and display web and hybrid apps with a single code base. Download it for free now! http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
