pic: Chain and Wheel in Tube

[GeeTwo]

Originally Posted by Nate Laverdure

Inside a 2" tall x 1/8" wall extrusion, this kind of chain retention only happens when using 17t sprockets. 2363 uses 16t sprockets. There are different reasons why our chains don't come off the sprockets.

My point was not that all chain-in-tube has close-fit sprockets (the one pictured in OP is not), but that this technique could be exploited with a dead axle to make even "tape measure and drill press" tolerances feasible.

[Chris is me]

Originally Posted by GeeTwo

My point was not that all chain-in-tube has close-fit sprockets (the one pictured in OP is not), but that this technique could be exploited with a dead axle to make even "tape measure and drill press" tolerances feasible.

Nothing about a dead axle drivetrain lowers the position tolerance requirement for an exact-center drivetrain at all. I have no idea what you're talking about here. You need more precision than that regardless of whether or not your axle spins.

[Al Skierkiewicz]

Matt,
Having worked through a problem with this design with a team at Championship a few years ago (it did not go well), I can only give you a few words of caution. It is essential that you provide for chain stretch. Chain stretches and it only takes a small amount to jump up during operation and lock the drive against the inside of the tube.
The second is a restating a post I made just a few weeks ago. If you want to win on Einstein, don't design something that can't be fixed in a few minutes with simple tools in near dark conditions.
Good Luck!

[notmattlythgoe]

Originally Posted by Al Skierkiewicz

Matt,
Having worked through a problem with this design with a team at Championship a few years ago (it did not go well), I can only give you a few words of caution. It is essential that you provide for chain stretch. Chain stretches and it only takes a small amount to jump up during operation and lock the drive against the inside of the tube.
The second is a restating a post I made just a few weeks ago. If you want to win on Einstein, don't design something that can't be fixed in a few minutes with simple tools in near dark conditions.
Good Luck!

This is exactly one of the reasons that we won't be switching from our WCD chassis to this.