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Creating Metric Internal Thread - Complete Novice
peter_jones587
Member Posts: 1 ✭
Hello,
I'm 100% new to CAD and 3D, however i'm trying my best with absolutely zero knowledge.. I have the requirement to create little spacers in metal and i'd like to try and create professional drawings..
I've created a part and made it public..
https://cad.onshape.com/documents/311682b65509f9f6c5f0f5fe/w/e9f9ebcd345033017f628db8
The issue i'm having is creating the internal thread which should be M3 - 0.5 pitch. I've created the helix with the correct pitch, but getting to the next step which has this cut into the part is where i'm stuck.. I've tried to follow tutorials on the "nut" example which shows an equal triangle needs to be made and then attached to the helix somehow?? This is where i'm in to deep.. How is this done? How do you go about creating the thread for M3?
Anyhelp would be appreciated.
I'm 100% new to CAD and 3D, however i'm trying my best with absolutely zero knowledge.. I have the requirement to create little spacers in metal and i'd like to try and create professional drawings..
I've created a part and made it public..
https://cad.onshape.com/documents/311682b65509f9f6c5f0f5fe/w/e9f9ebcd345033017f628db8
The issue i'm having is creating the internal thread which should be M3 - 0.5 pitch. I've created the helix with the correct pitch, but getting to the next step which has this cut into the part is where i'm stuck.. I've tried to follow tutorials on the "nut" example which shows an equal triangle needs to be made and then attached to the helix somehow?? This is where i'm in to deep.. How is this done? How do you go about creating the thread for M3?
Anyhelp would be appreciated.
0
Answers
1. Because you are working with internal threads...you will need to have a hole or bore that is equal to the minor diameter of the threads...not the major diameter. Currently you have a 3mm diameter hole which won't work for internal threads. If you were modeling OD threads then you would want 3mm diameter because you would be working with the major diameter.
Alter your hole to the minor diameter of a M3x.5 thread. You can look at the tap drill chart for this. I would recommend using the hole tool in onshape so you don't have to look it up.
2. Next you will need to need to create a sketch of the triangle on a plane that is tangent to the endpoint of the helix. You can create a curve point plane and select the helix endpoint and the profile of the helix.
Redraw your triangle on this new plane.
Dimension the triangle and use sweep cut....using the helix as the path and the triangle as the profile.
If you run into rebuild errors....the triangle is most likely too big in free space and intersecting itself as it sweeps the helix. Make the flat edge opposite of the tip smaller so it won't intersect itself on the ajacent sweep path.
Hide the helix.
Let me know if you have any more questions.