Here is another common bearing design and these folks do supply editable 3D CAD files. https://www.skf.com/us/products/rolling-bearings/roller-bearings/tapered-roller-bearings/single-row-tapered-roller-bearings/productid-30302 I like tapered bearings because the "play" can be adjusted. They are used in pairs with some kind of threaded tension device (screw threads) pushing them together. Even if printed the pair have such a wide base they don't wobble.
If you plan to use printed bearings you design the machine differently with MUCH larger bearing race diameter and much large ball/roller size. Perhaps 3X larger. The entire machine needs to be designed around the bearings. What I do is FIRST look on eBay to find the best deal on sealed bearing units. then step #2 is design the machine parts they go into. Many times you find skate bearings and make those work. Other times you find there is a common tapered roller bearing that sells at a low price. If you print the bearing you really must make it oversized compared to a metal one. You can't swap metal and printed plastic interchangeably as if they had the same strength and tolerances On Tue, Mar 30, 2021 at 3:55 AM Gene Heskett <[email protected]> wrote: > On Tuesday 30 March 2021 00:25:59 Gregg Eshelman via Emc-users wrote: > > > Use a ball cage that snaps in. I designed an example that uses 12 > > steel BBs. > > > > https://www.thingiverse.com/thing:1769802 > > Bearings are made with the parts sized so that when the inner race is > > shifted as far to one side as it can, the gap on the opposite side is > > just wide enough to insert the balls. When as many balls as can be are > > put in, the balls are distributed around as the inner race is moved to > > the center. Then either a one piece plastic cage is snapped in from > > one side or a two piece metal cage is riveted or spot welded between > > the balls. > > > Great idea, I downloaded it, but its not in an editable src form so it > could be parametized to make any size. .stl's are not easily editable. > Something from something like openscad would be much more usefull. > > Thanks Gregg. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
