MEG 440

Fall 2005

Project 2

Design a garage door opener for a two-car garage door. Power transmission should be through power screw. Here are some suggested design steps:

i. Find out the weight of a typical sectional aluminum two-car garage door.

ii. Select a power screw from a supplier. The length of the screw should be related to the total travel.

iii. Perform all force calculations needed for this screw.

iv. Select a nut for the screw. Ensure that stresses in screw and nut are within allowable limits.

v. Calculate the rotational velocity of the motor based on what you consider as a reasonable speed of the door travel.

vi. Select a motor that fits within your torque and speed requirements.

vii. Design a safe enclosure for the garage door opener. Ensure that the enclosure is rigidly attached to the ceiling by selecting appropriate bolts.