How do you make a rope wrap around and pull an object using gears?

[sarias]

Hi friends,

I am trying to make a manual log splitter using gears and springs. My plan is to wind a wedge back onto a spring using 3 gears and rope or wire ( anything that will get the job done really). I have posted a image and files. I am a student and just started using this software any help would be greatly appreciated guys.

Thank you!

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[mbonka]

Hello Sebastian,

personally don´t think you need to model rope. It´s just "cosmetic part". l´m going to skip this part, but if l have to model it (from rendering reasons), try following:

First options:

    - create the warp part as a "spring" (HOW TO CREATE EXTENSION SPRING IN CREO2.0 - YouTube) --- rope part that is wraped on wheel

    - create a straight part of rope and use flexible function (mastering creo by exampels 45(mass-spring-damper system) - YouTube time 6:00) --- straight rope part from wheel to the end is flexible.

Second options:

     - try to define 3d sketch and use sweep feature

Can´t advice better

Regards Milan

[sarias]

Is there a way to pull the wedge back when i turn the gears? I dont need the rope i just need the wedge to move as the gears move. The reason i want this is so that i can analyze the stress on the gears due to having to pull the wedge back onto the spring.

Thank you

[dschenken · Accepted solution]

This can be done with a free-body diagram. The model probably won't be good enough to determine contact or tooth bending loads, but those are handled with conventional formulas available in gear design books.