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Kim, just curious....why is it necessary to temper the filing buttons? Bill
Still following along and enjoying I like the heat treatment methods for the filling buttons They would have been a good solution to rounding off the little end of the connecting rod.
I would think that the filing buttons, being so short and just being rubbed on, would not need the tempering, though it won't hurt. For a longer shaft, it's important to prevent cracking. I've hardened the ends of clock pivot shafts so they wear better and don't bend, for them tempering was very important.Are parts like valves or crankshafts on model IC engines hardened?
Kim, I am just trying to learn here too. Tempering is a part of the full process as you say, a balance between hardness and toughness. My thought was that not being subject to much shock, you would want the buttons as hard as possible, but that is just speculation on my part. I am hoping to learn something myself.Bill
Quote from: crueby on August 02, 2017, 02:39:45 AMI would think that the filing buttons, being so short and just being rubbed on, would not need the tempering, though it won't hurt. For a longer shaft, it's important to prevent cracking. I've hardened the ends of clock pivot shafts so they wear better and don't bend, for them tempering was very important.Are parts like valves or crankshafts on model IC engines hardened?Interesting, that you harden the pivot shafts on clocks. Makes sense, but I had never thought about it. Do you harden the bearing hole the pivots sit in too?Can't answer anything about ICs, but I'm sure someone here can! Kim
Hi Kim,Still following along, you are making great progress, steam up can't be too far away!
The pivot ends on clocks are usually a barrel shape, which reduces the area in contact with the side plates, and also helps hold the oil. They are hardened. The plates are brass, which you can't harden beyond the state they are in when the sheet is manufactured.
The little details and finicky parts are often time consuming
Has your heat wave subsided yet??
Hi Kim, Still following along, you are making great progress, steam up can't be too far away!On the filing button front, the old guy that I use to go to & use his shop, didn't harden his filing buttons as he didn't want to blunt his files. So I followed that idea, you just let the buttons roll when the file gets to them, yes it means that you have to remake them from time to time but that's no biggy! The only thing I do differently is that I use a spring on the bolt, shaft or what ever you use to hold the buttons to keep them pressed up against the work piece, just make sure you use a nyloc nut (or 2 if you use a shaft) or the shop elves will be whooping for joy at have new things to play with fir d in there direction!Hi, if the filing buttons are hardened won't the file just glide over them ? i always harden mine ,but don't bother to temper them ?? Good work going on hereWillbert