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Motorized Bicycle Welding, Fabrication and Painting - The Chop Shop Custom fabrication and projects, tanks, frames and more.

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  #1  
Old 12-20-2016, 07:39 PM
trackfodder trackfodder is offline
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Default jackshaft

As a device to go to sleep I have lately been building motorbike components in my mind. Last night I was thinking of a better way to mount a jackshaft. I would machine the ends of black pipe to accept sealed 16mm I.D. ball bearings. Then mill a portion of the O.D. to receive a flat plate of about 3/16" thickness with rounded corners wide enough to mount U-bolts to secure it to the seatpost above and below the tube. Then a dog-point setscrew or 2 into the frame to prevent the jackshaft unit rotating. Insetting the plate into the tube wall would look better and allow a nicer weld bead. I am still playing with the Lawnboy 4 HP in a Cranbrook frame idea. It might get my COMET VST. Just too cold to do squat right now.
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Old 12-21-2016, 12:22 AM
msrfan msrfan is offline
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Default Re: jackshaft

How about welding it right into the seat tube?





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Old 12-21-2016, 12:43 PM
trackfodder trackfodder is offline
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Default Re: jackshaft

I like to keep m options open. A weld is forever. Incidentally, your work looks very professional.
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Old 12-21-2016, 02:46 PM
msrfan msrfan is offline
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Default Re: jackshaft

Thank you, I know what you mean. It would be hard to go back from here.
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  #5  
Old 12-28-2016, 09:56 PM
Amarion1 Amarion1 is offline
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Default Re: jackshaft

Quote:
Originally Posted by msrfan View Post
How about welding it right into the seat tube?






I absolutely love this!! Never would have thought to do it like that. How are you going about making sure its straight? I may do this on a future build if my wife lets me do another one.. for extra support, where you weld the tubing to the housing. I would drill both top and bottom to the i.d. and tap in some solid rod. Then you can weld tubing to the outside and the rod to the inside of the shaft housing. Locks it all together beautifully then :-D
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  #6  
Old 12-28-2016, 11:35 PM
msrfan msrfan is offline
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Default Re: jackshaft

I've used this system once before and it works perfectly because I made a transition collar top and bottom to weld everything in place. I held it square with wood blocks and plywood while welding.










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