Creating a D shaft -- How do I extrude part of inner diameter?

[Anonymous]

This is my first project in any autodesk program.

I am trying to create a custom wheel shaft for this motor to attach to 2" diameter PVC pipe.
https://www.amazon.com/gp/product/B073S6DCRQ/ref=ox_sc_act_title_2?smid=A36ZH2MCHPKXUA&psc=1

I have sketched a 7mm diameter cylinder rod that will be inserted all the way through the pipe after Pilot holes are drilled on the outer diameter. I inserted a center hole in the middle of the rod to allow another smaller rod to intersect (like an X ) and distribute energy more evenly across the pipe.

I have attached a cylinder to the outer side of the larger rod to attach the motor to. The motor is a d-shaft or "shaft with drive flat" (I am new to these terms). The shaft size is 6 mm, so I made the outer diameter 7 mm, then inserted a 6mm hole on the inside.

I now need to extrude or fill part of the inner diameter with a half cylinder to finish the D-shaft shape but I have no idea how to do this. When looking at other project examples and extruding objects, it looked a bit more complex than what I was trying to achieve. I haven't worked with planes, sketches or anything else other than basic shapes so far.

What would be the best way to do this?

[Johnc911]

" I haven't worked with planes, sketches or anything else other than basic shapes so far."

You really need to have a basic understanding of sketches to go any farther with Fusion 360. Sketches are one of the core principles in using the program (and any other parametric CAD).

Here's a very basic video to help you get started with understanding the basic idea of sketches. Once you watch this, you'll know how to make the shape you want. If not, come back and describe what you tried.

https://www.youtube.com/watch?v=A5bc9c3S12g&t=867s

PS: The video is using an older version of Fusion, but you will probably still be able to follow along. Just beware of that.

[laughingcreek]

I agree, you need to develop sketching skills.

in the mean time, here is one way to extrude the shape you describe.

file-export as .f3d your model and attach here. you'll get a whole bunch of suggestions I'm sure

https://knowledge.autodesk.com/community/screencast/cb24c992-00ce-4a3d-8213-c8068f0ed33f

[g-andresen]

Hi,

Is it that what you are looking for?

günther

[chrisplyler]

It's pretty easy. You make a sketch, probably something like this...

...and then you Extrude both the outer wall and the flat in a single operation, like this...

You really, really should go through some of the very basic beginner tutorial material that can be found in the Help menu. And you should really, really, avoid using the primitive Box, Cylinder, Sphere and Torus elements. They're only going to cause you headaches.

[gregorykDDE2P]

What about these corners of the D? Should i somehow fillet them?

[davebYYPCU]

Use modelling fillets, preferred over sketch fillets, which cause additional constraining work.

Might help...

[gregorykDDE2P]

but then they will sort of collide with the shaft, no? also, the CNC people don't seem to like small diameter fillets. What diameter would you use?

[davebYYPCU]

Small as possible, I was referring to the d tube sketch in the thread, a matching shaft would have to allow tolerances and no rounding / slippage under load.  

I can answer questions and model stuff the engineers have figured is needed.

Might help....

[gregorykDDE2P]

i am very tight on budget 🙂 however if you are up to a small brainstorm, i would be extremely glad and grateful (within the tight budget)

[etfrench]

Only if the shaft inserted into it will have fillets.