Ok, so there's no provision in the thread tool to offset the start of the thread. However, there are a couple of ways that I can think of to get around it. You could split the hole face at a given depth, then thread the portion below. Or you could use the hole tool, which gives you the option of setting a start depth for the thread. This doesn't appear to be an option for tapered threads though.
So the next issue is that Fusion doesn't come equipped with NPT in the parallel hole (for obvious reasons!) or the thread tools. If you don't actually need the thread to be "modelled", and a cosmetic thread is adequate then you could create (or download an existing) NPT thread file. I imagine that as long as you've got a thread (ideally with the correct designation) in there that the mfg workspace can pick up on then that's probably all you need. I'm not aware of an NPT thread file being available but for this application I would expect you could use one of the parallel pipe thread files that you can find on the forum. You just need to rename the designations from say NPSM to NPT. If you're tapping then I expect the Major, Pitch, and Minor diameters will be ignored.
Hope this helps.
If this answers your question please mark the thread as solved as it can help others find solutions in the future.
Marcus Wakefield
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I've created a Windows application (and now Mac as well) for creating custom thread files for Fusion. You can find out about it here. Hope you find it useful.
If you need to know how to offset threads for 3D printing then I've created a guide here which you might find useful.
If you would like to send me a tip for any help I've provided or for any of my software applications you've found useful, you can do this via my Ko-Fi page here.
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