Techniks sells nuts that they claim are better than ball bearing nuts, because of their "Powercoat". http://www.techniksusa.com/metal/pwrctnt.htm And they do tighten down very nicely, at least when new. After they've been used for a few years I'm a bit skeptical. I've found the finish does wear off of the collet contacting surface fairly quickly, I think the tightening advantage comes more from the coating on the threads, that seems to last longer than the part against the collet nose. Still it does wear off eventually.
How often should these things be replaced? We have some that have been in service for 10+ years of multiple daily tool replacement. (and it shows.) Worst tool holder/nut combo I've used were some HSK63F ER40 tool holders from T-ToolUSA. We've had a lot of trouble with the threads on these nuts and tool holders galling. One hung up so bad I almost couldn't get it off, tearing out large chunks of thread in the process. And these were only torqued to 90ft/lbs (using a proper torque wrench). ----- Original Message ----- From: "Gene Heskett" <[email protected]> To: [email protected] Sent: Tuesday, April 12, 2016 10:48:09 AM Subject: [Emc-users] ER-20A nuts for TTS adaptors Greetings all; I bought 5 of what were purported to be the higher torque capable ER-20 nuts, implying the cone in the nut was ball bearing supported. What I received yesterday were very well finished nuts, but the front cone was not hiding a ball bearing. Marked as ER-20-A, they are quite well finished, so I will keep them, but be aware that there are less than truthfull descriptions out there on fleabay. I think we all knew that, but hope springs eternal I guess, so I bit on what seemed to be a good deal... :( 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> ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
