Orthographic views - completing missing views?

[eterna]

Hi, sorry for this very basic question.
I have just started my course and having some trouble on something that's sure to be a required skill as I progress.

About all I can do is block out the depth and width of the top view, and then I just get confused as to actually projecting the features from the side and front views to the missing top view. Does anyone have some resources to share?

Is there a general procedure to approaching these problems?

 

[mfb]

The link looks broken.

 

[eterna]

The link looks broken.

I posted it as an attachment now.

 

[mfb]

Is there a general procedure to approaching these problems?

In general, there is no unique solution to the problem.
You can try to match features of the different projections with each other, and get a 3-dimensional model of the relevant surfaces.

 

[jehake12]

If you want to get good with projections, play around with a solid modeling program. Buy a student edition of solidworks, Creo, Inventor, etc. They are usually cheap ($100) if not free. You can model simple geometries and then go to the drawing sheets to check out 3rd angle projections.

 

[timthereaper]

If you're a student, try getting some free student software at http://students.autodesk.com. Autodesk likes getting students hooked on their products.

 

[Jupiter6]

Is there a general procedure to approaching these problems?

I think some people are inherently better at this than others but you really don't need anything other than a pencil and paper to practice this stuff.

The way I worked these out was to sketch an isometric based off the the right and front views. I'm thinking that's what your textbook wants you to do. As you sketch the isometric, you'll start to see the the top view in your head. The hidden line in your example is the main attraction.


It's the opposite approach of deconstructing an iso into an ortho.

The more you practice, the better you get. FWIW, realize that the part in your example can be machined with only the front and right view. If it couldn't, you wouldn't be able to draw the top view, so keep that in mind and keep drawing. You'll get the feel for it.