Can anyone help me model this helix rotation feature on this component please?

[drizz831]

Stuck on modeling this feature. Only notes im given is a dimension of 1.25" at 60*

I think i probably need to use the sweep tool to achieve this but have no idea on how to go about it. Any help would be greatly appreciated. A screencast would also be very helpful.

[TheCADWhisperer]

I recommend turning on Capture Design History.

I recommend fully defining every sketch.

[drizz831]

so apparently the top view sketch is drawn incorrectly.

How would i use the 1 in cylinder body to sweep along the path to the circle on the right and then rotate it 60* and follow the rest of the path. I tried to project the sketch onto the main cylinder but it didnt look acurate

[TheCADWhisperer]

Before I spend time on this - do you have an interest in learning how to model correctly in Fusion 360?

[drizz831]

Absolutely. I use it everyday and its part of my job 

[TheCADWhisperer]

Step 1 - you establish an Origin - just like on the shop floor on Lathe or Milling machine.

Back in a minute with example...

[TheCADWhisperer]

@drizz831 

Examine the sketch in the Attached file.

Note the use of dimensions.

Note position of the Origin Center Point datum.

Note the geometry is black (not blue).

[TheCADWhisperer]

Note the Timeline History of features - just like out on the shop floor process sheet.

Examine the Attached file.  Editing is easy if needed to change dimensions...

[TheCADWhisperer]

Note the Holes with defined positions.

Easy to edit if needed (I did tapped holes where you did through holes).

[TheCADWhisperer]

Note the Holes with defined positions.

Easy to edit if needed (I did tapped holes where you did through holes).

Depending on the function of the part - I probably should have modeled with this face as the datum face...

rather than this face...

[TheCADWhisperer]

That was the simple stuff Modeling 101.

Now let's progress to the complicated feature.

I would start over and start as sheet metal for a trick to overcome a limitation in Fusion 360 - then do the necessary work to get back to where we left off...

https://www.youtube.com/watch?v=Wekmai5MqFM

[drizz831]

That was super informative and in depth but also seems kinda overly complicated. Doesn't the new emboss feature attempt to solve this?

[TrippyLighting]

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@drizz831 wrote:

Absolutely. I use it everyday and its part of my job 

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Frightening!

[drizz831]

lol why do you say that?

[TrippyLighting]

Because your design violates the basic rules for modeling with a parametric CAD system. Fully un-constrained and un-dimensioned sketches.

Likely imported and left as is. The only reason this hasn't bitten you yet is because you went ahead and modeled in direct modeling mode where sketches are not parametrically tied to geometry.

My suggestion would be to pay careful attention to what @TheCADWhisperer has to say!

[drizz831]

yeah its not my design and was probably drawn in the early days of cam. i check my models dimensions off the print too. I'm pretty proficient with modeling just struggle with 3d sketching sometimes

[TheCADWhisperer]

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@drizz831 wrote:

 Doesn't the new emboss feature attempt to solve this?

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No.  The geometry will not be correct.

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@drizz831 wrote:
I'm pretty proficient with modeling...

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I knew just by looking at the picture I would have to start over - and it isn't even my project.

I have never been very proficient at "putting lipstick on a pig" as they say...  😮

For CNC though you might not need the modeled geometry - perhaps only the toolpath projected to the cylindrical face.  The cutter will create the geometry.

[drizz831]

yeah gonna program it by hand just thought it would be cool to learn how to model something like that.

[TheCADWhisperer]

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@drizz831 wrote:
... just thought it would be cool to learn how to model something like that.

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Now you know how to do it.