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Hollow blue thread
tj_thorniley
Member Posts: 65 ✭
Just wondering why this thread I made is blue, unlike the rest of the object. And why it doesn't have a solid face that I can sketch on for the final extrusion.
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Best Answer
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Jake_Rosenfeld
Moderator, Onshape Employees, Developers Posts: 1,646 
@tj_thorniley :
The part is a different color because it is a separate part (it is not geometrically connected to the brownish part). This is probably due to using 'New' instead of 'Add' in one of your features, but it would be easier to figure out if you posted a link to your document.
If the parts are currently touching and you would like to join them, you can use the 'Boolean' feature with he 'Union' option. If they are not currently touching, you will need to connect them geometrically before they can join to become the same part.
https://cad.onshape.com/help/Content/booleanparts.htm
https://www.onshape.com/videos/essentials-multipart
As for your second question, you must use a planar face or construction plane for a sketch. If the geometry you've created doesn't have a planar face to define a sketch plane with, you can use the 'Plane' feature, which can create a construction plane based off of a number of different combinations of geometry. You can then sketch on this construction plane.
https://cad.onshape.com/help/Content/cplane.htm
Jake Rosenfeld - Modeling Team1
Answers
The part is a different color because it is a separate part (it is not geometrically connected to the brownish part). This is probably due to using 'New' instead of 'Add' in one of your features, but it would be easier to figure out if you posted a link to your document.
If the parts are currently touching and you would like to join them, you can use the 'Boolean' feature with he 'Union' option. If they are not currently touching, you will need to connect them geometrically before they can join to become the same part.
https://cad.onshape.com/help/Content/booleanparts.htm
https://www.onshape.com/videos/essentials-multipart
As for your second question, you must use a planar face or construction plane for a sketch. If the geometry you've created doesn't have a planar face to define a sketch plane with, you can use the 'Plane' feature, which can create a construction plane based off of a number of different combinations of geometry. You can then sketch on this construction plane.
https://cad.onshape.com/help/Content/cplane.htm
The boolean options along the top of the features actually have some smartness built into them based on the selections you make. If you make something that doesn't touch anything else it will go to 'New', but if you start an extrusion that touches an existing body it will try to automatically change to 'Add'. Of course, you can always override the guesses we make manually.
Good to hear about the progress!