Projecting to a curve/tube and cutting towards centre line - Inventor Pro 2017

[Anonymous]

Hi all,

I'm new here.

I've been learning Inventor from tutorials etc, so I'm certainly no expert.

I wonder if someone can help me.

I have been trying various ways to create a toothed detail around a curved surface.

Nothing seems to work for me.

I'm trying to create 2 separate parts that rotate and drop into each other, I need to cut/split along the line.

The cut needs to follow to the centre point and not parallel with the centre line, which is the problem I am having.

Hopefully this is explained properly.

Thanks in advance for your help.

Davie

[SBix26]

Post your file here-- someone will show you how.  I will suggest one thing-- sketch one tooth profile, then pattern the resulting feature.

I'm away from my Inventor computer for the week, so I won't be able to provide a file or video; I hope someone else can.

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Sam B
Inventor Pro 2020.2 | Windows 7 SP1
LinkedIn

[Anonymous]

Thank you SBix26.

I've tried to split/extrude/loft but i never works for me.

I get the feeling it's something that is relatively simply but just can't get it to function without some errors showing.

I tried to draw one piece and do a circular pattern for the remaining but again it doesn't quite work for me.

I've a feeling there's something wrong with my sketch that is preventing me.

File is attached below.

[SBix26]

Your choice of method will depend partly on how the actual parts will be fabricated.  If they will be machined, then a sweep would be helpful (Solid Sweep in 2019 and 2020 would be easiest, but not available to you in 2017).  If you do a search in this forum for "barrel cam" and see some of @JDMather 's advice I think you'll be able to get this to work.

Update: try this link

Good luck!

---

Sam B
Inventor Pro 2020.2 | Windows 7 SP1
LinkedIn

[Anonymous]

I've managed to do some of it by projecting and wrapping the sketch to the surface and then highlighting each tooth and using the Thicken/Offset to cut out the highlighted part.

This looks like what I'm trying to achieve, although the sketch does appear to be broken and it won't allow me to cut the last tooth. Not sure how to fix this.

I don't know how to use the cam design tool, but it looks to be a pretty useful tool.

[blandb · Accepted solution]

Your sketches are not fully constrained. The revolved sketch needs (2) dimensions, and sketch 3 has 33 dimensions needed. That could be why the final thicken wont work. Fully define the sketches, and make sure there are no rounding errors. 

It appears that your curve length is off a little (rounding errors). When I added a parameter that calcs the circumference, and then set your sketch relative to that, fixed some of the sketches, I could get what you are looking for:

[Anonymous]

Thanks Blandb.

Yes that explains it alright. I'll take a look at the parameters dialog box to see if I can figure it out.

Not my strong point.

[johnsonshiue · Accepted solution]

Hi! To model the geometry exact like a rod or a disc tool cutting round the tube, you need to use Solid Sweep in 2020.

Many thanks!

[Anonymous]

I've had a good go at it but I think it's outside my limited capabilities, setting parameters etc to constraints.

I think I will need to employ some expert help, I'm afraid.

Is there a section on here for asking if someone can work on a project or if they know of anyone?