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Chain jumps sprocket

Chain jumps sprocket

Chain jumps sprocket

I have been working on a project that requires a chain and sprocket.
I have a #40 chain with 2 matching sprockets. My problem is that the chain
seems to jump sprocket under load. I am not sure if i need to get a larger
chain and sprocket or get a double chain to fix the problem. This is not an
engineering problem per say however no other forums have given me viable
solutions. Essentially there seems to be to much torque and the weak spot is
where the chain transfers power from one sprocket to the other. Any ideas?

RE: Chain jumps sprocket

Is this a new design?
Are the chain and sprockets new?
Are the sprockets aligned?
Do they remain aligned under load?
What is the free length of chain between sprockets?
How much torque?
What diameter sprockets? . . . . .

je suis charlie

RE: Chain jumps sprocket

Actually, it is an engineering problem, per se, exactly, and otherwise.

If you are not an engineer, you need to find one locally.

In addition to gruntguru's excellent questions, said engineer will also need to know the stiffness of whatever structure supports and separates the respective sprockets.

Mike Halloran
Pembroke Pines, FL, USA

RE: Chain jumps sprocket

Some pictures of your installation would answer a lot of "our" questions, and probably trigger a few more.

My first blindfolded suspicion, as MikeH said, is stiffness of the drive and driven "stuff".

Well, maybe the first should be "How is chain tension adjusted or maintained?"

RE: Chain jumps sprocket

When you say "jump" do you mean it comes off the sprocket or that it moves a tooth on the sprocket? If the slack side of the chain has too much slack then I could see how either might happen. Too much slack could be a static tension problem or stuff shaking when operated at speed. Can you watch it at slow speed?

RE: Chain jumps sprocket

Two of the most common reasons for a chain jumping a tooth on a sprocket are stretch in the chain due to it being long or overloaded, and not having a tensioner close to the slack side of the driven sprocket.

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