topic Re: Drawing a spline in fusion 360 in Fusion Design, Validate & Document Forum

Drawing a spline in fusion 360

patrickZ24NR — Mon, 24 Apr 2023 18:42:34 GMT

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.

Re: Drawing a spline in fusion 360

a.laasW8M6T — Tue, 25 Apr 2023 02:03:57 GMT

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=&collection=&sort=&query=geaR

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)

Re: Drawing a spline in fusion 360

patrickZ24NR — Tue, 25 Apr 2023 13:33:00 GMT

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.

Re: Drawing a spline in fusion 360

a.laasW8M6T — Tue, 25 Apr 2023 18:00:10 GMT

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.

Re: Drawing a spline in fusion 360

patrickZ24NR — Tue, 25 Apr 2023 18:42:49 GMT

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?

Re: Drawing a spline in fusion 360

HughesTooling — Tue, 25 Apr 2023 19:07:24 GMT

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

Re: Drawing a spline in fusion 360

TheCADWhisperer — Wed, 26 Apr 2023 11:05:37 GMT

@HughesTooling wrote:
There's some talk on this forum and a link to some software ...

@patrickZ24NR

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

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

Re: Drawing a spline in fusion 360

patrickZ24NR — Wed, 26 Apr 2023 12:41:28 GMT

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

Re: Drawing a spline in fusion 360

patrickZ24NR — Wed, 26 Apr 2023 13:20:08 GMT

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

Re: Drawing a spline in fusion 360

patrickZ24NR — Wed, 26 Apr 2023 14:32:59 GMT

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.