i make the assembly drawing accroding CSWA QUESTION , when i finish the assembly, i find my answer is : x=2.75 y=24.33 z=-40.24

but the correct question is x=2.75 y=24.33 z=40.24, z is different, i am not sure why? can any one help me solve it out?

i make the assembly drawing accroding CSWA QUESTION , when i finish the assembly, i find my answer is : x=2.75 y=24.33 z=-40.24

but the correct question is x=2.75 y=24.33 z=40.24, z is different, i am not sure why? can any one help me solve it out?

- The origin of your model has a negative Z coordinate. It is supposed to be positive. So your assembly is placed on the wrong side of the Z plane. You should move your assembly on the positive side of the Z plane without moving the X and Y position.
- Charles if you look at the sample exam PDF file, the direction for both X & Z are negative. So there is no chance for the answers to be positive for X & Z directions.
The correct answer actually is C

**) X=40.24 Y=24.33 Z= 20.75.**This is the correct answer exactly. Any other answer is wrong. Deepak I suspect your answer is wrong because you did not use the right material in your components. I will send you the model if you need it. Here I will post the mass properties so you can see. And guys you must realize that the assembly uses a different coordinate system that you must create.

- Charles, can you also post the assembly pic with the coordinate system. I believe the direction might be different in your case.
Deepak:

Please carefully study the coordinate system axes in the sketch. The labels on the Z and X axes have minus signs (-) in front of the letter. That is indicating that the negative Z direction is toward the left, and therefore the center of mass quite obviously must be in the positive Z direction.

HI CHARLES

COULD U MIND SEND THE MODEL TO ME, I NEED IT TO CHECK MY MODEL

MY EMAIL IS SG55754550@163.COM

THANK U

I think you may be reading the coordinate system on the example in the wrong manner. Negative X and negative Z are pointing away from the model, so therefore the model lies in positive X and positive Z. Here is the model with my coordinate system and the mass properties box.