Ron Bean wrote: > We have a Bridgeport mill with an old ProTrak 15020 2-axis CNC system > You've already reported the motors have brushes. You need to see what they are driving them with, and see if they appear to still be serviceable. If the servo amps are industry-compatible, they would take +/- 10 V velocity commands, and both Mesa and Pico Systems (my company) have interfaces to drive them. Then, you need to see what the encoder or other position sensor is, and find out what resolution it provides. It is possible to run with pretty low resolution encoders on systems with tachometer feedback, but you may need to replace them with higher resolution if you are going to replace the servo amps and lose the tach feedback. I have some manuals for a number of different servo amps if you have one of the common makes in the machine.
Finally, you probably will want to add a 3rd CNC axis at some point. If you decide to trash all the electronics due to age and condition, I have a different system that uses digital PWM control for the servo amp, but as I mentioned above, may need the improvement of the encoders. If your encoders have incandescent light bulbs in them, then maybe they should be replaced for safety reasons, too. (If the bulb goes out, you can have a servo runaway.) Jon ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
