To oDesk Mechanical Engineers,
In the past I have used lesser qualified mechanical engineers. What I found was; their strength was either computational or design – not both. That was partly my fault because I could not afford to pay a higher priced engineer at the beginning R&D stages of the project
I am now beginning a second phase that requires a mechanical engineer who is capable in both computation as well as design – and who is able to provide engineering drawings that can be passed on to a machine shop to build the actual prototype.
I must make absolutely sure that the engineer or engineers that I hire at this point are capable and that I do not waste several weeks of time and end up being disappointed – as I have in the past.
There are still several hundred hours of engineering that is required so I must determine ahead of time the level of competency of the ones I hire.
In conjunction with one of my current engineers, I have created a problem that you must solve in order to be considered for this position. Do not simply reply by telling me that you are able to solve it without doing so.
YOU MUST SOLVE THE FOLLOWING PROBLEM AND ANSWER EACH QUESTION OR YOUR APPLICATION WILL AUTOMATICALLY BE REJECTED.
1) Firstly, I will provide you with a visual description.
2) Secondly, I will provide you with all necessary dimensions
3) Thirdly, I will provide you a list of questions to solve.
1. Visual Description
a. The basic structure is square shaped with radiused corners.
b. The square is a track in which a roller bearing can travel
c. there is a hub in the exact center of the square
d. One end of a telescoping rod is connected to the circumference of the hub while the other end of the telescoping rod is connected to the center of the roller bearing. Consequently, as the hub turns (counterclockwise) the roller bearing travels counterclockwise in the track housing. The telescoping rod necessarily extends and retracts as necessary to accommodate the traveling bearing around the track.
e. The hub is turned by an external power source
f. the center of the track housing is designated as the circumference of the track
a. the length of the rod at 3 o'clock when it is not telescoped is 20 feet
b. the outside diameter of the hub is 24 inches
c. the outside diameter of the bearing is 6 inches which travels snugly within the track housing
d. the inner diameter (female) of the bearing is 2 inches
e. the hub turns consistently at 1 mph
f. the radius of the corners is 18 inches
a. Assuming the square is represented by the face of a clock, at what speed is the bearing traveling at 3 o’clock?
b. At what speed is the bearing traveling as it passes the apex of the radius?
c. At what speed is the bearing traveling as it enters the curve of the radius?
d. Designating the center point of the track housing is the circumference of the square, what is the total distance around the track?
e. How many times does the bearing rotate within the track housing while making one full revolution around the track?