Den lör 2 jan. 2021 kl 20:27 skrev John Dammeyer <jo...@autoartisans.com>:
> > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > I've seen CAD models of the complete Bridgeport machine on GrabCad. It > > really is helpful to have a good model so you can test-fit parts before > you > > make them. > > > > I found a model of my Harbor Fright minimill so now I can able to make > > add-on parts that match the screw-holes on the mill, first try. Yes I > had > > the verify the model. I would not trust something I downloaded. > > > > I know what you said about dropping the z-axis faster than gravity > allows. > > I'm using a ball screw for that. Turns out the Chinese ball screws are > > cheap and actually better than spec'd. > > > Mine is equivalent to a Grizzly Tools G3616 now no longer made. And in > Canada House of Tools is long gone. The first thing I need to do is swap > the XY with ball screws. There's a guy in Australia that did a major > rework on this machine so he has some good videos and ideas. > > Needless to say there is no 3D rendering of the entire machine. I started > on that about 8 years ago when I first got AlibreCAD. Now I might move > forward with that and do some more. > > The knee assembly is just the screw and pulleys. The Y axis has a > truncated Knee casting since a full one would get in the way of seeing > things, even with transparency. And I only did enough of the X axis to > make sure things looked right. > > Haven't yet figured out how to create an assembly that has a toothed belt > that can be animated. I'm sure it's possible. But is it really worth the > time... > > I've also modeled several different ways to do ball screws. The X axis > has over 0.012" of backlash. Aggressive climb milling will pull the > table. So ball screws are next on the list once I bundle up rest of the > control cabinet. > > I now have enough AC Servos for the other axis but for now that would be > repeating what already works. X and Y are DC brushed servos driven with > HP_UHU kits. (I have two spares of those too). > > And pump oiler that still needs to be installed and plumbed. > > John > I made HTD5 pulleys two years something ago. We made an automation machine that needed bigger pulleys that we could find so I 3D printed one, sanded it slightly to smooth the grooves, made a silicone mould from it and then made two copies in GF powder reinforced epoxy. They are rock solid and the machins runs on a daily basis. /Sven _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
