Hi I need some help making internal thread in Onshape

Uchenna_Ubeh

I am trying to make an internal thread of only about two revolutions at a certain region in my CAD drawing, but it's not easy to accomplish this. I tried using the ThreadCreator feature, but it does not allow fixing the thread at a selected spot. Also, I cannot create this custom thread at a selected spot using the sketch tool. Can anyone please help me fix this problem? 
I have attached an image of the problem here. 

eric_pesty

Try the "threadlab" feature: https://cad.onshape.com/documents/5c0528b62c1fbb13a2a0e739/v/0bb9d00523f327052c0a2e24/e/7cbb452d4d5e963a034ce616

You probably will need a split feature in the face to define the starting position.

Uchenna_Ubeh

Thank you Eric

The ThreadLab feature was very helpful for the thread I needed. However, I am still trying to get a split feature that will work. Do you by chance have any to recommend?

eric_pesty

Hi,
I'm not quite sure what you are asking about the split... I just used a split feature with the following settings in the example above.

EDIT: here's a quick example: https://cad.onshape.com/documents/c6f509f684b0f732935bf9ae/w/9ca7144d3a48a3a61de3f2d3/e/92b9f1ea47de139ec1ca8265

Face split on the cylinder outer face (would work the same on the inside of a hole).
Entities to split: I used a mate connector based on the top face of the cylinder and offset down.

dirk_van_der_vaart

I use a trick for this

https://cad.onshape.com/documents/e7a8d63d1a4071ecc11fe053/w/5323653e395eef92f54072d4/e/6ed5424a851cbf619ab3b753

Uchenna_Ubeh

Thank you Eric and dirk_van_der_vaart your proposed solutions totally solved my problem.