1. often when dealing with a geometry problem i draw a sketch. however i find it impossible to draw a 3D vector or point onto a piece of paper.

Does anyone know of any techniques or way around this problem.

I tried drawing a x,y and z axis but it didnt work surprisingly

2.

3. Mechanical engineers use isometric projections

http://en.wikipedia.org/wiki/Isometric_projection

I imagine a computer program like autocad would make it easier.

4. Originally Posted by organic god
often when dealing with a geometry problem i draw a sketch. however i find it impossible to draw a 3D vector or point onto a piece of paper.

Does anyone know of any techniques or way around this problem.

I tried drawing a x,y and z axis but it didnt work surprisingly

It is hard to show 3D without loosing the actual angles involved to create the object. What looks like a 120 degree angle on paper is often a 90 degree angle in real life.

That is why you cannot just walk up to a house, take a picture, pop it into the computer and have the computer figure out how big a hand rail you need for the porch. There is just to much distortion, to much lost in two dimensions.

We usually make it up with text, dimensions or notes.

Sincerely,

William McCormick

5. I learnt a way using single point and double point perspectives, which gives you nice neat 3D sketches, but not accurate scale models. For once, I agree with William, adding dimensions to a sketch gives you all the info you need. Personally I use Solidworks now...which is all you'll ever need for mechanical design.

6. Originally Posted by bit4bit
I learnt a way using single point and double point perspectives, which gives you nice neat 3D sketches, but not accurate scale models. For once, I agree with William, adding dimensions to a sketch gives you all the info you need. Personally I use Solidworks now...which is all you'll ever need for mechanical design.

Could you create a little solid works drawing similar to mine, and show how solid works displays angles and such?

I would appreciate it.

Sincerely,

William McCormick

7.

8. Originally Posted by bit4bit
That is a nice 3D drawing.

I was wondering though, how does that programs tools for showing actual angles, either angles input manually or automatically look? Is it a time consuming thing or something simple?

I am assuming that solid works can output to cam (Computer Aided Machining/Manufacturing) applications? Or offers an interface to popular devices or standards?

Sincerely,

William McCormick

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