Fancy Constraints?

ryan_henning

There are a few constraints I'd like to be able to add. Perhaps it's already possible and I just don't know how! Will you all help me? (I'm new to CAD, so this is all new to me. But I'm having a great time building my model in OnShape!)

1. I'd like to be able to set the diameter of a circle equal to the length of a line.
2. I'd like to be able to set the length of a line equal to some ratio of the length of another line. E.g. Line 1 is always half the length of Line 2.
3. Combining the two above. I'd like to set the diameter of a circle equal to some ratio of the length of another line.

Are those things possible? Thanks!

3dcad

@ryan_henning
1. Draw construct line inside circle and set that line equal to other lines
2. Create variable before sketch and set line1 lenght = #var_linelenght, line2 lenght = #var_linelenght / 2
3. Just use variable as value for diameter

https://cad.onshape.com/help/#variable.htm?Highlight=variable

ryan_henning

@3dcad

Thanks! Variables, that makes sense.

NeilCooke

if you wanted to get half the length of the line without using variables you could sketch a construction line from the endpoint to the midpoint of the line then use an equal constraint on that. To get a third of the length, draw three end to end construction lines, set them equal length, and connect the ends of the chain to the endpoints of your original line.