Hi guys, new member to this form and I have a few questions.
First, a little background on my experience; 9 years as a machinist/toolmaker, and I'm currently working for a large CNC machine tool manufacturer in field service.
What I'm looking to do in the near future is build a small 3, possibly 4 axis CNC mill. I will most likely do a retrofit on a Minimill or similar. The possability of building one almost completely from scratch using linear ways is not entirely out of the question either.
Alas, my dilemma. As a CNC tech, I have some experience with DC servo's and servo drive systems, but I see many people here are using DC stepper motors? Other than being slower, how do these compare in accuracy and surface finish compared to a true servo system? Is anyone using feedback like encoders, or do most people depend on the motor to actually complete all commanded movements on steppers? On a small application like a desktop mill, is a servo based system really worth the extra expense and complication?
I've heard a lot about the Gecko DC Servo drives, aside from the obvious requirements of having a drive module for each axis and a power supply, what is needed for interfacing with a PC, and what control software is compatable with them? Does Gecko sell complete turnkey packages that would spare me the aggrivation of matching up components from all over? My experience is only in troubleshooting and replacing them (which almost never happens, our servo's and amps are extremely reliable) not designing drive systems for machines. Hopefully this will not only be a fun and challenging project for me, but a way to help me learn.
I'm sure I'll have many, many more questions as time goes on but I think this should get me started for now.. thanks!