Doug Crews wrote: > I would like to thank everyone for their feedback on “resolver > feedback”. As you can most likely tell from the Kollmorgan inventory I > have mentioned and the Parker inventory I have not mentioned, I come > from the old institutional motion control industry where you frequently > here the words “Oh, we don’t support that anymore you will need to > upgrade….!” The pain and scars are deep. > > Yeah, but all that gear wouldn't be on eBay all the time if the mfr's didn't do that!
> > A new version of this machine is in the planning phase and is > anticipated to use 9 servos on one half and 5 steppers and a USB camera > on the other half. It has a “millisecond” critical event between two > axes but for the most part everything else is not as critical… several > seconds in timing, and position is acceptable in the +/-.005” range. > > Well, the suitability of EMC2 is still in slight doubt. Do you need to make complex moves, such as might need to be programmed in G-code? Or, is this more a PLC sort of job, where this motor moves 20,000 encoder counts, then that motor moves 11,000? That likely could be all set up with a piece of code driving HAL directly. Or, you could set up a bunch of the positioning axes through HAL, and have the several programmed axes running under G-code command. Coordinating two axes, either under G-code or HAL command to move in synch should be no problem. Guve them each a position command at the same time and they WILL stay in synch. The USB camera is not something we usually deal with, but as long as there are Linux drivers for it, and whatever image processing software you plan to use, then it ought to be able to work. Is the camera for inspection, or does it locate some feature and then the machine has to perform a different move depending on what the camera saw? I don't think we have done anything like this before, but I would be VERY interested. (I have an old pick and place machine with an 80286 CPU, and one of these days it is going to croak. It doesn't have vision now, but if I ever have to retrofit it, that would be something I'd like to add. It would move the part over the camera, take a picture and then adjust the location to move the part to based on the image analysis.) 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
