# Homework Help: Calculate shaft for gears

1. Oct 5, 2012

### TyErd

1. The problem statement, all variables and given/known data
Tangential Forces :

Pinion A=2850 N
Gear B=2850 N
Pinion C= 8550 N
Gear D= 8550 N

Pinion A= 1000 N
Gear B= 1000 N
Pinion C= 9100 N
Gear D= 9100 N

Diameters:

Pinion A= 60mm
Gear B= 180mm
Pinion C= 60mm
Gear D= 200mm

The distances between Gear B and Pinion C for the moment can be said to be X(mm). and the distance between the gears and bearings can be said to be Y(mm).

2. Relevant equations
Moment = F*d

3. The attempt at a solution
I've attached a picture of how the gears/shaft/bearings are arranged.
My question is how do i calculate the shaft diameter(s)

using the moment formula i know that i can calculate torque for each gear. It would just be the tangential force*the radius of the gear. I have no clue what to do with the radial loads or if I need to calculate any other forces.

any help?

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2. Oct 5, 2012

### TyErd

just worked out the torque for each gear:

Pinion A: 85.5 Nm
Gear B: 256.5 Nm
Pinion C: 256.5 Nm
Gear D: 855 Nm

not sure what to do with these...

3. Oct 6, 2012