On 4/12/2015 5:35 PM, Gene Heskett wrote: > Neil, are you doing printed circuit boards? That's the intention at first. The machine will be multi-use, so 3D printer is next, and laser cutter later.
> This does take a more precise Z drive than is the usual for affordable > machines. Tight balls in fresh ball screws are a good starting point. Yep... exactly why this situation. The machine is home-built and designed to be very accurate, but I'm considering spring-loaded nozzles or mounting the PCB bed on spring mounts at some point, but for now, if I home it accurately I expect I'll be fine. I will also be re-designing the head for PCB pick-and-place to have multiple nozzles and an actuator. This is it so far... https://www.youtube.com/watch?v=30C1VRfbi9k > I have some roputines on my web page at the link below that might be > helpful, but they demand a Micarta pallet to hold the pcb material dead > level & square to the table motion. You will likely have to setup a > vacuum bedding to hold the PCB flat if over an inch in either direction > as it does have a tendency to warp laying on the shelf. I'm going to use an aluminum plate, so hopefully not warping. I'm planning to add some adjustment screws for the bed height/levelling, but a spring nozzle will help that quite a bit. > Look at tedautoz.ngc for one that can probe the pcb and establish a good > zero, using the actual engraving bit as the probe. It leaves no mark on > the copper. Found it... will check it out. Also found a 6809 book... wow! Brings back memories of my TRS-80 days. > Then, because you need to register both sides of a thru hole PCB, there > is tholefinder.ngc. I get repeat accuracy of about a thou with them. > This one does have to be calibrated for each individual PCB pallet you > fabricate though. OpenPnP has (or will have, as it's still in alpha state), camera fiducial detection capability. > The comments in the code should help you understand how they work, if > not, yelp. > > [huge snip] > > Cheers, Gene Heskett Much thanks, -Neil. ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
