Drawing a spline in fusion 360

[patrickZ24NR]

I am trying to draw a 13T- 30 Deg PA--16/32 DP on fusion 360 and struggling on how to do it. Has anyone ever done involuted splines before? Attached is the part of the print I am referring to. If anyone could guide me like a 5 year old on this it would be appreciated ufacturing  greatly. 

[a.laasW8M6T]

If you look on the Fusion app store there are many gear creator app.

https://apps.autodesk.com/FUSION/en/List/Search?isAppSearch=True&searchboxstore=FUSION&facet=&collec... 

Then you just plug in your numbers and it will generate a gear(spline) for you.

I tried with my gear app but the 16/32 DP doesn't make sense and gives an actual DP of 0.5 which makes a massive gear(26in pitch dia)

[patrickZ24NR]

Yeah I did that same thing and got that massive gear. No idea why. The print is from the people that currently make it. I have the part in my hand. Not sure what I need to do to get this drawn. 

[a.laasW8M6T]

Questions is, do you actually need it modeled accurately to machine it?

Like how are you going to machine the splines? If you were surface milling the form with say a ball nose you would need it to be accurate, but I don't see that being effective on such a a small spline.

otherwise for a form tool you could just have a crude visualization as long as you drive the tool to the correct base circle dia.

I suggest you maybe ask this question in the design forum as those guys are much better at modeling type questions.

[patrickZ24NR]

Yeah that’s what I thought too. I have a form tool and sketched in the lines where the center point should be. I’d think if I just follow that line and wear it in and out I’d be okay?

[HughesTooling]

A quick search shows 16/32 DP is valid for splines. Don't know how the diameters are calculated but obviously not the same as gears!

There's some talk on this forum and a link to some software here from  Gearotic Motion. Couldn't figure out cost for the software or where to buy?

Mark

[TheCADWhisperer]

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@HughesTooling wrote:

There's some talk on this forum and a link to some software ...

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@patrickZ24NR 

I would use Autodesk Inventor Professional to create this geometry...

Inventor 2023 Help | Involute Spline Generator dialog box - Design tab | Autodesk

[patrickZ24NR]

Didn't even know this was an option. I will look into it. I do very minimal spline work 

[patrickZ24NR]

okay I have it downloaded. How do I find those tabs you referenced? I have never used Inventor before 

[patrickZ24NR]

I'm currently using the free trial. I have the spline drawn on Inventor but need to upload it to Fusion 360. Is there a way to do that? I only need one spline and can't see myself spending money on Inventor if I only need it once.