# Embodiment calaculations for a automated (screw) bike seat post

1. Jan 29, 2009

### roy46

1. The problem statement, all variables and given/known data
I am currently tring to work out the torque that is required to lift a bike seat of mass 2kg at a rate of 10mms-1 with a given screw thread and nut. how would i go about this?

Also is it possible to calaculate the shear force experienced by the thread of the screw and nut when a body of mass 100 kg is sitting on the seat, with the full downward force being applied through the thread?

Attached is an image of the cross section of the design in a CAD suite.
2. Relevant equations

i understand that torque = Radius * Force

3. The attempt at a solution

torque = Radius of the shaft (14mm) * force of gravity acting on the seat (20N)

#### Attached Files:

• ###### automated bike seat post.jpg
File size:
21.1 KB
Views:
39
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted