Bit of help please from the technical minded, not SH
10-28-2014, 05:52 PM
#32
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Whatever you do, be aware of the cost if something goes wrong. A crash on the track can hurt no matter what, and it doesnt sound like she is in shape to brace for impact.
Even with good intentions or great disire to get on a bike, the danger is real, and increased with extra motor actions of shifting a non factory shifter. Not to mention if something you build fails and locks the bike in gear, even for a split second in a turn could be catastrophic.
Not to dissuade you but keep in mind that even a 20mph crash can & does result in broken bones, concussions, etc.
Just something to keep in mind.
Even with good intentions or great disire to get on a bike, the danger is real, and increased with extra motor actions of shifting a non factory shifter. Not to mention if something you build fails and locks the bike in gear, even for a split second in a turn could be catastrophic.
Not to dissuade you but keep in mind that even a 20mph crash can & does result in broken bones, concussions, etc.
Just something to keep in mind.
10-28-2014, 10:56 PM
#33
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Location: Auckland, new Zealand
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Whatever you do, be aware of the cost if something goes wrong. A crash on the track can hurt no matter what, and it doesnt sound like she is in shape to brace for impact.
Even with good intentions or great disire to get on a bike, the danger is real, and increased with extra motor actions of shifting a non factory shifter. Not to mention if something you build fails and locks the bike in gear, even for a split second in a turn could be catastrophic.
Not to dissuade you but keep in mind that even a 20mph crash can & does result in broken bones, concussions, etc.
Just something to keep in mind.
Even with good intentions or great disire to get on a bike, the danger is real, and increased with extra motor actions of shifting a non factory shifter. Not to mention if something you build fails and locks the bike in gear, even for a split second in a turn could be catastrophic.
Not to dissuade you but keep in mind that even a 20mph crash can & does result in broken bones, concussions, etc.
Just something to keep in mind.
She knows the risks and outcomes. But its in the blood.
10-28-2014, 11:04 PM
#34
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Well, that said, it is a mechanical dilemma. You dont think the heel toe thing would work?
So I would figure thumb shifter up and down levers, same way as a mountain bike. 2 levers so positive action in each direction. Cable actuated. The levers have springs on them to return to position.
So I would figure thumb shifter up and down levers, same way as a mountain bike. 2 levers so positive action in each direction. Cable actuated. The levers have springs on them to return to position.
10-29-2014, 04:41 AM
#35
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Join Date: Jan 2014
Location: Malden MA
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Linear actuator
To me anything with cables and levers will require to much force to operate at the handle bars. If you get enough leverage to reduce the force required the travel required will be awkward to manipulate.
Have you looked at linear actuators. The are available with 2" stroke and limit switches at each end. different speeds are also available. You would need to ad a limit switch in the middle of the stroke and some relays to allow it to return to the center position after up or down stroke. The actuators cost about $125.00 figure about that much again for relays and switches. I tried to upload a pdf of one but it was too large. Here is a web site that sells them Linear Actuator Linear Actuators
Have you looked at linear actuators. The are available with 2" stroke and limit switches at each end. different speeds are also available. You would need to ad a limit switch in the middle of the stroke and some relays to allow it to return to the center position after up or down stroke. The actuators cost about $125.00 figure about that much again for relays and switches. I tried to upload a pdf of one but it was too large. Here is a web site that sells them Linear Actuator Linear Actuators
10-29-2014, 08:26 AM
#36
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https://www.google.com/images?hl=en&...g&ved=0CCAQsAQ
This is one way to do it but of course the problem of the clutch pull arises. Although, have you thought of an atv as an alternative to track days? It kinda scratches the same motorized movement itch and more than likely you could trade the bike for a quad at no extra cost.
This is one way to do it but of course the problem of the clutch pull arises. Although, have you thought of an atv as an alternative to track days? It kinda scratches the same motorized movement itch and more than likely you could trade the bike for a quad at no extra cost.
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