On Thursday 06 August 2015 13:24:55 Dave Cole wrote: > On 8/6/2015 11:34 AM, Gene Heskett wrote: > > On Thursday 06 August 2015 11:14:15 Dave Cole wrote: > >> On 8/6/2015 10:12 AM, Gene Heskett wrote: > >>> Question, since the motors can get quite warm, how do you fix a > >>> die-cast 1x1x2.5" box to a motor? Most modern glues tend to come > >>> apart at higher temps. > >> > >> I've used Epoxy to glue die cast boxes to Stepper motors with great > >> success. Drill a hole in the back of the box to cover the hole in > >> the motor where the leads exit and glue it on. > >> I think I roughed up the surface of the box and the motor with a > >> sanding disk. > > > > Not the motors laminations I hope. That, with a sanding disk could > > lead to smearing of the metal and inter-lamination shorts and could > > cause some localized very high heating. Gently hand sanding with a > > 320 sponge to remove _some_ of the paint might be tolerable though. > > > >> I think I used Devcon brand but I think that JB Weld > >> would work as well. The JB Weld has a filler in it that might > >> help bridge some gaps. 3M has some interesting epoxy called > >> Scotch Weld that also looks promising. > >> > >> Dave > > > > Devcon is the "Bondo" maker. Lots of "void" filler in that. What I > > have on hand is several years old, leftover from repairing the > > bottom of my boat. And probably needs to go out with the trash. But > > JB Weld sounds like a better idea. I'll see if I can locate some as > > there's none in the toolbox ATM. I don't recall ever seeing the > > Scotch product locally, but haven't looked for it either. > > > > Thanks Dave. > > > > Cheers, Gene Heskett > > Yep, laminations and all. Didn't affect the motors at all. I didn't > grind them hard, just enough to take the paint off with the abrasive > disk so the epoxy would have a good bite on the steel. > That was 3+ years ago and the machine is still going strong. Non of > the boxes have came off. I tried to twist one box off after the > epoxy set but it was firmly adhered. Epoxy is handy stuff. > The Devcon I used didn't have any filler in it at all. (I have filler > I could have added, as I do fiberglass boat work, but it was not > needed.) I also waterproofed the motors via an epoxy coating over the > entire motor (12 of them) so they could operate outside in the weather > and I installed shaft seals. > They were then painted over the epoxy as well to protect the epoxy > from UV rays. > A chinese company was basically doing the same thing, but they > couldn't deliver the motors for 16+ weeks so I had to do the > modifications myself to standard, off the shelf, Nema 34 motors. > The motors were oversized for the application and run at reduced > current. I would have rather not had to use the boxes, but we needed a > junction box on the motor so we could junction a flexible cable at the > motor with a waterproof cord grip. > > Dave > And you Dave, like me, do whatever it takes. Some call us JOAT's. Gotta love it. ;-)
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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
