Neil wrote: > Oh yes, LOTS to do still, but this is the first successfully working > PnP test. The A-axis works but we didn't do any rotation for this > test. I also still need to build feeders, add camera & image > recognition, add positive pressure solenoid for extracting components, > and eventually build a nozzle-changer. And lots of software to work > with centroid files, etc. And I'm thinking I should design some type > of spring-loaded nozzle system to compensate for any minor height > differences. > Yup, some capacitors vary in thickness from one part to the next in the tape.
I have a 12 year-old or so Philips CSM84, with no nozzle changer, no vision, no Z axis. But, it has 3 heads and chuck centering jaws on the heads, plus a large component centering station. It uses a single-pixel camera for picking up fiducials from the board (moves heads in XY while watching the sensor for dark or reflection). It has a human-only camera for locating the pick-up location of parts on the vibratory feeder. It has vacuum sensors on each nozzle and will perform a bunch of different cycles to continue running when something goes wrong. So, if a part gets stuck to the nozzle, it will pop up and down and blow to try to get it to drop off in the dump bucket. If it doesn't get the right vacuum when picking up or just before placing it will dump the part in the bucket, but if the vacuum goes back to normal after using the centering jaws, it will place the part. (Sometimes the part is not picked up well from the tape, but the centering jaws restore it to the proper position.) It does real well with 0805 and SOIC parts, but is pushing the capabilities for SSOP and fine-pitch chips. I was lucky to get about 60 feeders with it, and they are quite complex. Each feeder certainly has over 50 parts in it. All the small feeders are actuated by the same air cylinder that makes the head go up and down. The larger feeders (16 mm tape and up) are operated by an air cylinder in the feeder that is controlled by a valve tripped by the head air cylinder. Jon ------------------------------------------------------------------------------ Get a FREE DOWNLOAD! and learn more about uberSVN rich system, user administration capabilities and model configuration. Take the hassle out of deploying and managing Subversion and the tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
