Re: [CAD_CAM_EDM_DRO] encorer feedback

they do nothing more than hold position like Mach2. A software that monitiors axis position via encoder feedback is only required when the axis actuator is inadequate for the task at hand i.e. insufficient torque etc. Who wants that anyway?

>

Well, the difference is that with Gecko drives you don't know WHERE in
that +/- .020" region the machine
actually is. (Normally it is very close to the commanded position, but
you don't know for sure.) As
the velocity increases, the following error increases. For some
applications, a .020" error is
totally unacceptable. For others, it would be no problem.

///There is no error. Its not a sluggish or an approximate attempt to keep up with position. Set the handwheels on zero in the morning, run all day and they are back exactly on zero at night. Thats all one could ask and expect of any machine. If the motion control is inadequate and cant keep up, then a monitoring system is neccesary. Otherwise its redundant. The control was checked daily so many times at first for positioning errors with none detected that I dont even consider positioning errors anymore. The only positioning errors I've found are the ones that I make occasionally.

Ron

Obviously your bridgeport setup satisfies your needs, and that is
great. Mach2 and Gecko
(or Xylotex, Rutex, etc.) drives are making a lot of parts for a lot of
people.

EMC costs LESS than Mach2, and does offer encoder feedback to the PC.
One thing this
allows is a sliding scale of acceptable following error. You can permit
a larger following
error at rapid traverse speeds, but a very small following error limit
for low-speed
cutting moves. Also, you can switch back and forth between CNC and
manual movement
(on machines with handwheels) with the same coordinate system. I don't
know if it works that
way in Mach2.

Jon

///You can do that with Mach2/gecko by disabling the drives with a jumper/switch off ERR/RES and then it becomes a DRO system. I didnt incorporate this feature. To me, thats like buying a car and then pushing it down the street. As soon as the retrofit was succesful, I couldnt get the handcranks off of it fast enough. :-)

The Dos based softwares that were reviewed when making a selection were not very appealing and downright boring. This one feature is a big price to pay for not enjoying the many features in Mach2. I upgraded Mach2 software to the latest release a few weeks ago and it is very impressive. The "wizards" for hole patterns etc. A customer was by the other day and I showed him the programming sequence in Windows. Minimize Mach2, open Bobcad, typed his name, vectorized, saved and loaded in mach2 and was running in less than a minute. Its very impressive.

Ron



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