On Sunday 06 September 2015 05:05:09 Erik Christiansen wrote: > On 05.09.15 20:49, Gene Heskett wrote: > > This brings up a question re locking the shaft into its bearings. > > Red threadlocker seems like it should work. Doesn't. Superglue > > seems like it should work. Doesn't. These bearings are a hundred > > lb or more press fit on this A2 shaft, and they still walk the shaft > > thru them given enough time. > > > > So, is there a magic glue concoction that will lock the shaft to the > > bearings? > > Dunno how good the magic, but a month or two ago, I asked the > manufacturers of Loctite whether their 680, or 680 upgrade, > gear/bearing retaining goop, with appropriate primer, would be good > for locking a zirconia bearing onto a stainless steel shaft. they > said: > > "Unfortunately, LOCTITE anaerobic products (like the 680) can only be > used on metal surfaces. Zirconia is a non metal (i.e. ceramic) and a > Primer is not suitable for this application." > > So I didn't try it, but it might do the trick in your application. > I found their info file: > > 328661_Customer_Infomation_Loctite_680_AP_131105.pdf > > from this page: http://www.loctite.com.au/retaining-4052.htm > but there's doubtless a page somewhere with less electron-mileage in > it. > > The headline illustration in the pdf shows preparation for its use in > retaining a bearing. The introduction says: "Typical applications > include holding gears and sprockets onto gearbox shafts and rotors on > electric motor shafts."
Since these treadmill motors all seem to be a threaded shaft, that is of interest. > Incidentally, I figure you meant "locking the shaft into one of its > bearings", the other necessarily being retained in its housing > instead, to allow for thermal expansion of the shaft, chosen e.g. a > la: > > http://www.smbbearings.com/technical/bearing-shaft-housing-fit.html > > Erik > (who's only pretending to know anything about bearings) Heck Erik,I don't even play one on tv. ;o) Thermal expansion shouldn't be a problem as the alu frame will likely not warm as fast even if its expansion is greater than a piece of A2. Temp range over a year in that building is from about 40F to maybe 105F when its all closed up in the summer sun. But I have a vent fan that comes on when the humidity or temps go about 70 or so, just enough electric heat in the winter to keep everything above the dew point. I hate rusted tools. 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
