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OT: Need advice on connecting 2 axles

Old 03-10-18, 05:06 PM
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Reynolds 
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OT: Need advice on connecting 2 axles

This is not bike related, but I know there are many knowledgeable mechanics/machinists in this forum. Mods, feel free to move this thread if needed.
I'm fixing an old self-propelled lawnmower for a friend. It was neglected for years but I managed to get it running again. Now I want to replace the transmission shaft, which was a hack using a piece of radiator hose as universal joint. It kept tearing off, of course.
I need to connect the engine (25mm round shaft, keyed) to the gearcase (20mm round smooth shaft). These two shafts are roughly in line and don't move relative to each other, but need some kind of flexible/universal joints, as I can't assure they are 100% aligned. The distance between shaft ends is 240mm. Engine power is 8HP @ 2500RPM.
What would be the simplest (and not too expensive) way to do it?

Last edited by Reynolds; 03-10-18 at 09:50 PM.
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Old 03-10-18, 05:56 PM
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Lookup flexible couplings. There are multiple styles depending on the application, how much flex you need, and how much power is transmitted. Even though it's an 8HP engine, I doubt the wheel power is more than a 1HP or so.
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Old 03-10-18, 05:57 PM
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www.mcmaster.com

Search there, order the correct part and you'll be fine. You might need some sort of adapter. But McMaster-Carr is the best place for that sort of thing. You could do a lot of work coming up with something, but I'd bet you could buy the correct part or adapter.
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Old 03-10-18, 06:10 PM
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Originally Posted by gsa103 View Post
www.mcmaster.com

Search there, order the correct part and you'll be fine. You might need some sort of adapter. But McMaster-Carr is the best place for that sort of thing. You could do a lot of work coming up with something, but I'd bet you could buy the correct part or adapter.
If McMaster doesn't have it, it likely doesn't exist! You ever have a printed copy of their catalog? About 6" thick!
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