Sweep on helix does not go all way through

omri_r

Hi all,

I'm trying to sweep a shape on a helix from start to end.

It seems that the shape start is OK, but the sweep does not go all the way to the end of the sweep. It's like stopping when it touches the end but not continue beyond it as in the start location (hope it clear...).

https://cad.onshape.com/documents/c1fb23babb4668e97ce5a361/w/cfb88a1305b78db795157f5a/e/c557c043baf4e8974edace76

I would really appreciate in someone has a solution or explanation what am I doing wrong.

Thanks!
Omri

steve_shubin

@omri_r

https://cad.onshape.com/documents/27e7637ab7db99f57115ed89/w/bf5411083e9bdf6bd76cbd50/e/b176f6a587da85bfcc208c57

steve_shubin

@omri_r

https://cad.onshape.com/documents/27e7637ab7db99f57115ed89/w/bf5411083e9bdf6bd76cbd50/e/b176f6a587da85bfcc208c57

omri_r

Perfect!
Thanks a lot!

marcel_robitaille927

Why do I have to add 3 features (copy, scale, delete) to add a simple thread?

alnis

@marcel_robitaille If you want to add a standard thread in 3D, you can use the Thread Creator custom feature:
https://cad.onshape.com/documents/6b640a407d78066bd5e41c7a/v/845d049782179b9faee8b6e6/e/c953720c264ce001f1a82dc1

If you just want a cosmetic helix to represent the thread, you can use the Cosmetic Thread custom feature:
https://cad.onshape.com/documents/60de6d7733c1f01904ca5910/v/5d4bf4f5092053503ba95894/e/e4819e5cbfc03801eeb168e9

For non-standard shaped threads, do you happen to know of a faster workflow in other CAD packages? If so, then maybe we can find some analogous tools in Onshape to speed up the process.

william_lutz912

My question after all this is now how do I create a drawing without the sacrificial part showing up in it?  I've tried making it transparent and hiding it, but in the drawing it automatically shows all parts in the file.

eric_pesty

william_lutz912 said:

My question after all this is now how do I create a drawing without the sacrificial part showing up in it?  I've tried making it transparent and hiding it, but in the drawing it automatically shows all parts in the file.

You have several options:
- create a delete feature to get rid of the part after the helix is created
- When you insert in the drawing, only pick which parts are inserted instead of inserting the whole part studio
- Hide the part in the drawing view (right-click on the view and select show/hide parts)

You could also just create an extruded surface (and extrude further than the base cylinder) from the sketch that creates your cylinder for the helix reference (instead of 2 features that create an extra part). I prefer to use surfaces for this as it's more "obvious" that they are reference than a copy of a part (but that's just a personal preference, the end result is the same).

steve_shubin

@william_lutz912  said:

how do I create a drawing without the sacrificial part ..,

Here is a couple ways

https://cad.onshape.com/documents/d2cbd47e8fc2c975c2cbca85/w/81d9cdbc30a2b4e7a0b789f1/e/190815e81398d92404331d56

steve_shubin

@marcel_robitaille927 said:

Why do I have to add 3 features (copy, scale, delete) to add a simple thread?

You don’t have to add 3 features

Take a look at Part Studio 1
It was done in 4 steps (features)

Sketch
Revolve
Spiral
Sweep

https://cad.onshape.com/documents/d2cbd47e8fc2c975c2cbca85/w/81d9cdbc30a2b4e7a0b789f1/e/b566cbe1afe7d11b542c9850