Sergey Izvoztchikov wrote: > I'm faced with dilemma, which has no obvious answer for me at the > moment. I was set to buy Xylotex steppers based kit for my CNC Sherline > Mill. After reading more about servo based systems I'm divided, I could > appreciate number of advantages of servo based systems > > - no missed steps, corrections via closed loop > - faster movement speeds, more IPS > - positions display (DRO) > > However, stepper systems are cheaper and basically ready out of the box > compare to DIY servo based system, which would require significant > build and setup time. Note, I don't have funds for commercial out of the > box servo based kit. So, DIY is preferred option. > > I don't know exactly what kind of work I will do on my CNC Mill in the > future, so it's also hard to target setup to future work. I guess I'm > trying to decide is it worth the effort and money to build a "better" > system (servo based that is) or should I not bother for such a small > Mill as Sherline and go with steppers just fine ? > > Any pros and cons of both type of systems are welcome, especially in > relation to usage on Sherline Mills/Lathes. I wish my source of the Japan Servo servo motors still had stock, but they are all gone. I sold a bunch of them for retrofits of Sherline and Taig machines, and have them on my minimill, as well. If you can find some Pittman motors with encoders, those would also work. (I got some Pittman 4443 brushless servos that are REALLY nice, but at $200 each, I don't think I'll be selling these in the hobbyist market.) You can see what turns up on eBay. A size 16 or 23 motor with a 4:1 belt reduction will do great.
I am a "servo bigot", and just don't want to do anything like machining metal while "flying blind", which is how I think of stepper systems. Jon ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
