> 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
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