- Joined
- Jan 28, 2019
- Messages
- 62
I have had my 9"C since winter and have found it far nicer then the "toy" Atlas I had before. It came with a single pulley motor and countershaft arrangement, offering only 6 speeds. As my nature is i have begun to see if I can expand this range. So i bought a dual step counter shaft pulley and shaft recently. I also sourced another 110V AC motor with a two step pulley. (I have plans to make a motor to counter shaft belt tension adjustment swing arm, but that's another story). My current question is in two parts.
First is part numbers and compatibility. The two step counter shaft pulley and shaft has #PT2542NL1 cast on it. I can't find it in the manuals I have, or on line. Any insights?
The second is the condition of the shaft. It is well worn and scored with a rib like surface. The shaft measures about .875" in the non work portions. Of course the portion between the driven pulley and the cone pulley area is worn more then the other bearing area. The wear is about .050" taken from the tops of the "ribs". (My current single step pulley and shaft are also worn to the amount that I can jiggle them easily, no measurement but a lot IMO).
This second aspect has me wondering if I can source a section of precision ground stock, ,875" in diameter, and replace the worn shaft. The pulley's tapered drift pin would have to be driven out and a matching tapered hole made in the replacement. Is this reasonable? Am I over thinking the wear and ribbed surface of the new to me shaft? I wonder about the counter shaft cast housing/bracket's bushing wear too. In my world of human powered stuff this wear would be a lot.
This is a long term project as my day job is very busy these days. In NYS the bicycle service business is considered an essential one and the shop I work for is very overwhelmed. Dreams, now if ever, are important to maintain connection to a normal future. Between riding and my frabrication/frame building projects I have little stress relief these days. Any help, history or insight is appreciated. Andy
First is part numbers and compatibility. The two step counter shaft pulley and shaft has #PT2542NL1 cast on it. I can't find it in the manuals I have, or on line. Any insights?
The second is the condition of the shaft. It is well worn and scored with a rib like surface. The shaft measures about .875" in the non work portions. Of course the portion between the driven pulley and the cone pulley area is worn more then the other bearing area. The wear is about .050" taken from the tops of the "ribs". (My current single step pulley and shaft are also worn to the amount that I can jiggle them easily, no measurement but a lot IMO).
This second aspect has me wondering if I can source a section of precision ground stock, ,875" in diameter, and replace the worn shaft. The pulley's tapered drift pin would have to be driven out and a matching tapered hole made in the replacement. Is this reasonable? Am I over thinking the wear and ribbed surface of the new to me shaft? I wonder about the counter shaft cast housing/bracket's bushing wear too. In my world of human powered stuff this wear would be a lot.
This is a long term project as my day job is very busy these days. In NYS the bicycle service business is considered an essential one and the shop I work for is very overwhelmed. Dreams, now if ever, are important to maintain connection to a normal future. Between riding and my frabrication/frame building projects I have little stress relief these days. Any help, history or insight is appreciated. Andy