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Re: Export to 3mf does not export the NPT thread
You seem to have found one of the rare few parts in the mcmaster carr catalog modeled with straight threads instead of the correct NPT geometry. CAD manager must have been asleep that day. I went and pulled one from the elbows catalogue which has better thread models I've validated with my own 3d prints. The way I approach models like this is to get a single studio cooked up with the features I want to use on other models and to use it as a seed for the Point Derive custom feature so if I need to make changes to my clearances or geometry for this 3/4" NPT geometry later I just need to update the source studio and it'll force downstream updates anywhere it's used. Think of it like a geometry catalog instead of a parts catalog.
Re: how can i make a spiral in Onshape
You can actually achieve a flat spiral with the helix tool without needing the edit curve step if you use the axis mode and draw to an end point. I was messing around with opHelix when writing some curve features and it supports flat planar outputs as well as cylindrical / conical outputs. Weirdly though it doesn't support cylindrical AND flat outputs simultaneously (i.e. a flat circular arc output) so I had to write my own 3d circular arc functions to compensate.
Re: Best way to construct a rex axel shaft from gobilda?
You'll have better luck getting help if you provide the info (text, pics, description of what specifically is hanging you up) rather than asking for people to go on a scavenger hunt. By asking in the way that you have you have limited your audience to those in the "know" and those that are curious and have plenty of time to research. Is this what you want to model?
MDesign
Re: how can i make a spiral in Onshape
One of the multiple ways:
Helix curve then use Edit curve to planarize and reapproximate (smooth)
https://cad.onshape.com/documents/8efddfb1d2b9f0efb133f1da/w/852a25bd82baf51214f78c61/e/1c8417d1d56c4bb11da2ddba
Re: how can i make a spiral in Onshape
there are multiple ways:
us a featurescript (by @Pascoe):
https://cad.onshape.com/documents/abb998532f54a132a42bea8b/v/c8a10bd7be466c936ab1e590/e/fd1c85d2bd07ba022788d886
or create a helix on a cone. (and if you need a flat spiral, you can project it onto a plane)
