Help working with extruded circles / cylinders

[Anonymous]

Working on what I thought would be a simple DSLR lens adapter. I have sketched circles and used push pull to make what is essentially a cup to fit the DSLR lens into.  Now I am trying to add the features on the inside of the circle/cylinder that grab the tabs on a DSLR lens when rotated into place. I cannot for the life of me figure out how to get these features to attach to the inside of the cup/circle.  Can someone recommend how I should best tackle this type of design issue?  I have attached the file I created along with a picture showing an already made part that has these features similar to what I am trying to accomplish.

[Oceanconcepts]

There are many ways to do this, a set of cylinders and the revolve tool come to mind, but I would use your sketches since that is the way you started and it allows for easy modification of parameters.  

The latch appears to be an L shaped piece of what is essentially another smaller cylinder inside the main body. You want to make parts of that cylinder with a sketch extrusion and join the latch part to the body. You could make this entire part with just one sketch by simply extruding different sections to different depths and combining or cutting with the resulting bodies. 

You might want to go through some of the tutorials and learning materials that cover basics of sketching and modifying in the model workspace. 

[Anonymous]

Ron,

   Thank You! Was not thinking in this direction at all.  I was trying to draw on the push pull face.  This is a very simple way to get the job done. Exactly what I was looking for and I truly appreciate the time you took to post that tutorial.  Thanks again. 

One more question. With that method if I wanted to put an angle on those latches so that the part of the horizontal latch was thicker at the L intersection then at the open end of the latch how would you do this?  By thicker I mean in the vertical dimension across the horizontal latch. Basically a ramp in the tab that get progressively thicker to grab the tab of the lens.  Picture attached.

Thank you.

Randy

[Oceanconcepts]

One method would be to use the Draft tool on either the body that you use to cut the “L” shape, or on the surface itself. The draft tool works well for creating angled planar faces. In direct modeling you can just use the Move tool on a face as well. 

[etfrench]

Here's a lens plate for Olympus 4/3rds mount.  I used 3 sketches. One for the profile which uses the Revolve tool. One uses Extrude/Cut to make the tabs, and the last uses Extrude/Cut to make the locking depression.  The wide flange is for attaching a custom bellows.