Creating Conical Threads in Fusion 360?

[damianvox]

Hello All,

I'm currently working on a project that requires reproducing threads for a screw head, which have a unique conical shape. I've attached an image with the specific threads highlighted in red for clarity.

My objective is to create the female inner threads that correspond to this specific screw design.

We intend to use CNC machining to create these inner threads, if feasible. Currently, we are utilizing Fusion 360 to generate the necessary CNC code for this task.

Has anyone here successfully modeled inner conical threads in Fusion 360? If so, could you share your approach or any tips on how to accomplish this?

Any guidance you can provide would be incredibly valuable and greatly appreciated.

Thank you for your time and assistance.

Conical

[a.laasW8M6T]

You can model them, but it's not that straightforward, like theres no thread making wizard to do it for you.

Before exploring how to do it, do you actually need to model the threads or do you just need to machine them?

Because in Fusion, having a modelled thread doesn't help you machine it in most cases.

How will you be doing the machining? turning on a lathe with the appropriate tooling would be the best approach.

[damianvox]

Thank you for your guidance. I realize I wasn't clear in my initial explanation. My objective is to create the female inner threads that correspond to this specific screw design.

We intend to use CNC machining to create these inner threads, if feasible. Currently, we are utilizing Fusion 360 to generate the necessary CNC code for this task.

[a.laasW8M6T]

Ahh ok I see

You can model a tapered hole a the correct minor dimensions and then apply a 2D thread operation and it will generate a tapered toolpath.

I think you will struggle to accurately machine these with a threadmill as the 60° angle of the threads isn't perpendicular to the screw axis its follows the conical angle instead.

The only way to machine this with a standard threadmill would be to create a 5 axis type toolpath which is certainly possible but would require some thinking on how to drive it.

IIRC you are using a Pocket NC correct?

[damianvox]

Yes, that's the machine. We could do a 5-axis type toolpath. We milled the normal cylindrical threads already.

I think I mentioned it before; I am only doing research for the guy with more experience on this.

Are you suggesting that the conical threads need to be manually drawn as Fusion won't generate them automatically?

[a.laasW8M6T · Accepted solution]

Yes you will need to model some Drive Geometry for those threads.

Fusion can make holes for some tapered threads like BSPT and NPT but that's all really

[damianvox]

Perfect. I'll share this with my coworker. Thank you