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Quote from: tvoght on August 28, 2017, 07:50:59 PMI put a slip eccentric on "Robby" my Roberts Mechanism engine. The discussion starts here:http://www.modelenginemaker.com/index.php/topic,5293.msg107925.html#msg107925It worked fine, but I disabled it because it caused a distinctive knock that I didn't want to be heard when showing it. I don't know if that's common to slip eccentrics or just my own implementation.I never really put any effort into trying to remedy it.--TimI remember that build Tim! But it doesn't show any completed pictures. You should post one.I could see how a slip eccentric might result in a knock. In fact, when I rotate the drive shaft by hand, at a certain point in the rotation (at least in one direction) the eccentric pin disengages from the drive collar as gravity pulls it down. Then the flat on the collar catches up with it and things continue as expected. That could certainly cause a tick! I'll have to listen next time and see if I hear any knocking.Kim
I put a slip eccentric on "Robby" my Roberts Mechanism engine. The discussion starts here:http://www.modelenginemaker.com/index.php/topic,5293.msg107925.html#msg107925It worked fine, but I disabled it because it caused a distinctive knock that I didn't want to be heard when showing it. I don't know if that's common to slip eccentrics or just my own implementation.I never really put any effort into trying to remedy it.--Tim
Quote from: Kim on August 28, 2017, 08:59:38 PMQuote from: tvoght on August 28, 2017, 07:50:59 PMI put a slip eccentric on "Robby" my Roberts Mechanism engine. The discussion starts here:http://www.modelenginemaker.com/index.php/topic,5293.msg107925.html#msg107925It worked fine, but I disabled it because it caused a distinctive knock that I didn't want to be heard when showing it. I don't know if that's common to slip eccentrics or just my own implementation.I never really put any effort into trying to remedy it.--TimI remember that build Tim! But it doesn't show any completed pictures. You should post one.I could see how a slip eccentric might result in a knock. In fact, when I rotate the drive shaft by hand, at a certain point in the rotation (at least in one direction) the eccentric pin disengages from the drive collar as gravity pulls it down. Then the flat on the collar catches up with it and things continue as expected. That could certainly cause a tick! I'll have to listen next time and see if I hear any knocking.KimI wonder if a small spring loaded detent would do the trick to keep it from slipping?
Good point Dave! I picked up some stuff like that a while back when it came up on someone else's thread - Some stuff in a green fat-pen-looking bottle. That should do the trick! Thanks for mentioning it. I'll have to make sure and use that when I solder up this part. I keep forgetting about that!Kim
I don't remember what sort of torch you're using.... Twer it me, I would use an average propane torch and a small heat-trap type fire brick hearth. Pre-place the flux and bits of braze then heat it fast with a big, soft flame. Always heat the big parts, not the small ones.Little bits like those should heat and flow in less that two minutes, probably less.