I could use a little help, I need to model some Acme threads inside a split nut using Vcarve. You can see in the picture what I am trying to achieve. The threads are a 5/8x4tpi. [AD3BF0A0-1ED5-4998-802F-ADB2D21B502A]

Fusion360 has a built in thread tool. You can simply make a block, create a hole through it and apply the correct thread geometry to the hole. Split the block and export the object as stl or whatever you are needing. [threads]

Thanks for sharing. Sounds simple enough, now I just need to teach myself Fusion. Thanks again.

Jeff were you able get this completed? This split nut looks a lot like a piece I need for a legacy mill. I want to try and 3d print one, any information you can provide would be appreciated. Thanks Eric Gantner

Hi Eric, I’ve modeled and 3d printed a nut block like the ones openbuilds uses in their cncs… i did so using fusion360 and instead of modeling the block using the threading tool (it doesnt support acme) i imported the acme lead screw from grainger and used the combine function and “cut” away the th…

Eric My hope was to create the halves for my Legacy as well. Unfortunately I did not make any progress. My hope was to be able to use my CNC to cut the grooves out of a solid block of material.

[image] SethCNC: it doesnt support acme Are you sure about that? I’m not by a pc, but I’m pretty sure it does support standard ACME threads. @EricRGantner or @JeffWimer What are the thread specs for your machine? If they’re not standard, you’ll probably have to draw them, or as Seth said, …

When I tried it i could only get NPC and Machine Screw Thread types. I googled it and found other posts about it on the F360 forum with replies from their staff saying that it couldn’t do ACME… However I was doing the Trapezoidal ACME with a 4 start and and I forget the pitch, but not exactly a sta…

Fusion has standard ACME threads. Non standard threads or custom threads are tricky in Fusion. I hope they eventually add comparable tools for coils like those in Inventor, which is where I’d make custom threads. Importing a 3d model to use in a combine is great in Fusion, but that only works if yo…

Neil, This is what I found out. 5/8 dia 4 threads per inch, thread angle is 29° pitch is 1/4 inch. Break break Seth, I only have VCarve Pro, and none of the other programs. Do you know if Fusion 360 trial version will allow me to do this? I figure one I go to export etc…. I will be denied. A…

F360 hibbyist license (free requires annually attesting to the rules of use) will let you do this … the free version really has not much for limitations. They reduce how many files you can actively edit at once because only a busyness would need to edit 10+ models at the exact same time… and they l…

Modeling Acme threads inside split nut

NeilFerreri1 February 14, 2023, 5:17pm 12

Yeah, that’s not standard. Can you find any more specs? Single or double start?
Again, I’d look for a tap.

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