How to sketch a sin wave along a circle like this tool

alexandre_vallette

hello,
i need to draw this tool but i have no idea how can i reproduce the inner part of this tool (see picture).
any advices would be welcomed.

thanks

konstantin_shiriazdanov

you could make this with some curve scripts but you could also just use circle arcs
https://cad.onshape.com/documents/57f3ddd19d44f3c0031903a6/w/b499a2024fc0a55653bae772/e/db0b472b46edd36e57cf4f17

NeilCooke

Yes, from the image it looks like just circles not a sine wave - easy to model https://cad.onshape.com/documents/235120b2860379b7320cdf1c

konstantin_shiriazdanov

you could make this with some curve scripts but you could also just use circle arcs
https://cad.onshape.com/documents/57f3ddd19d44f3c0031903a6/w/b499a2024fc0a55653bae772/e/db0b472b46edd36e57cf4f17

NeilCooke

Yes, from the image it looks like just circles not a sine wave - easy to model https://cad.onshape.com/documents/235120b2860379b7320cdf1c

alexandre_vallette

I'm not able to reproduce the curve generator like @konstantin_shiriazdanov
what are the steps ?
- create the two variables a and d
- in the sketch create two construction lines with the angle constraint depending on a and the length depending on b
- create a curve generator defining the range of a and selecting d

this is what i did but the curve is not drawn

konstantin_shiriazdanov

make sure you don't use external references for sketch constraints and dimensions and also check if you selected all the features which are dependent from parameter variable

also notice that my #dl variable contains expression which depends on #a value: 2.5*sin(20*#a*deg)

alexandre_vallette

thanks !
and then once i have it how to create a solid from the curve ? I can't extrude ?

konstantin_shiriazdanov

the script creates 3d curve, to extrude the profile - create a sketch and project this curve in it ("use" command in Onshape sketch). then this profile would be usable for extrude.

alexandre_vallette

thanks a lot for your help

sam_biddle

I have this surface that I'd like to create a curve around.  What is the best way to do this using the generate curve tool?

konstantin_shiriazdanov

@sam_biddle if you don't care much of the presize shape of those waves there are a plenty of ways. For example: https://cad.onshape.com/documents/59007ff281e43510ea3797a2/w/a6cb15bca8f1b2bf6e312ccd/e/3ef6c66875cc751998ad8d45