M
MtnGoat
Guest
Standarized jackshaft for NuVinci
Thanks Myron and Zomby Builder. Now I've got it clear in my mind, how those bearing hangers/washers work. I'm thinking these might be replaced by the bracket that attaches to the bike frame, using the same sized hole to attach to the bearing.
Zomby Builder, do you think it is necessary to double the bearings for a typical MB jackshaft? Or was that something specific to that one project?
Myron, I'm already comfortable calculating the gear reduction values, due to reading some of your previous posts on the subject. Thanks for getting me up to speed on that score. And you didn't even know you had! Like I said I've been scouring the forum for any information I can find about jackshafts.
Andrew was hoping to find or develop a standarized jackshaft for the purpose of easily using the NuVinci hub in mb applications. Getting in the right range might be difficult when using the NuVinci hub off a single jackshaft that moves the drive to the right. The usual Happy Time setup reduces an additional approx 4 to 1 by going from the drive sprocket to driven sprocket on the wheel. 4 to 1 makes for a pretty big sprocket on the jackshaft if one can't get any additional gear reduction going from the jackshaft to the NuVinci hub. Seems Staton is using a 36 tooth driven sprocket on the NuVinci hub, AFTER already reducing the ratio to 18.75 to 1 in his gear box. I don't understand why such a big 36 sprocket is appropriate, but I'm sure he's got it calculated correctly.
The NuVinci at $250-300 with sprocket would be quite attractive. My only reservation is the weight, assuming I could work out the gear reduction and right side drive issues cost effectively.
Thanks Myron and Zomby Builder. Now I've got it clear in my mind, how those bearing hangers/washers work. I'm thinking these might be replaced by the bracket that attaches to the bike frame, using the same sized hole to attach to the bearing.
Zomby Builder, do you think it is necessary to double the bearings for a typical MB jackshaft? Or was that something specific to that one project?
Myron, I'm already comfortable calculating the gear reduction values, due to reading some of your previous posts on the subject. Thanks for getting me up to speed on that score. And you didn't even know you had! Like I said I've been scouring the forum for any information I can find about jackshafts.
Andrew was hoping to find or develop a standarized jackshaft for the purpose of easily using the NuVinci hub in mb applications. Getting in the right range might be difficult when using the NuVinci hub off a single jackshaft that moves the drive to the right. The usual Happy Time setup reduces an additional approx 4 to 1 by going from the drive sprocket to driven sprocket on the wheel. 4 to 1 makes for a pretty big sprocket on the jackshaft if one can't get any additional gear reduction going from the jackshaft to the NuVinci hub. Seems Staton is using a 36 tooth driven sprocket on the NuVinci hub, AFTER already reducing the ratio to 18.75 to 1 in his gear box. I don't understand why such a big 36 sprocket is appropriate, but I'm sure he's got it calculated correctly.
The NuVinci at $250-300 with sprocket would be quite attractive. My only reservation is the weight, assuming I could work out the gear reduction and right side drive issues cost effectively.