I'm looking for examples of mechanisms that can constrain a hub rotating around a shaft from 0 to 360 degrees. Rotation between 0 and 360 should be free. Rotation < 0 and > 360 should be stopped.

A few things I think could work but I am not not sure what this is called and searching on google has not helped.

a simple pin would allow for 0..(360 - pin_width)

a spiral would allow hard stops 0..360 but the pin would need to float radially.

a gear set of 2:1 would allow for pins but would add some complexity.

thanks for any ideas folks might have and/or any names i might be able to use in a google search

I'm looking for examples of mechanisms that can constrain a hub rotating around a shaft from 0 to 360 degrees. Rotation between 0 and 360 should be free. Rotation < 0 and > 360 should be stopped.

A few things I think could work but I am not not sure what this is called and searching on Google has not helped.

• a simple pin would allow for 0..(360 - pin_width)
• a spiral would allow hard stops 0..360 but the pin would need to float radially.
• a gear set of 2:1 would allow for pins but would add some complexity.

Thanks for any ideas folks might have and/or any names I might be able to use in a Google search.