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# Shell tool gives wrong dimensions?

Member Posts: 3 EDU
I am trying to make a vacuum nozzle that goes from a ⌀1.2" to a ⌀0.5". I make two sketches, one of them offset above the first by 1 inch, and the bottom circle is ⌀1.2625" and the top circle is ⌀0.5625". I use the loft tool to make a cone-shaped transition between them, and then use the shell tool to make the solid shape a hollow cone with walls of 1/16" or 0.0625". I then measure the distance between the two circles, and I get 0.066218 in which is not 0.0625 in. How is this possible, and what do I do to fix this?

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Member, User Group Leader Posts: 809 ✭✭✭✭✭
Bryan Lagrange

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Moderator, Onshape Employees Posts: 5,519
Because shell is a wall offset.
Senior Director, Technical Services, EMEAI
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Member Posts: 3 EDU
Okay...so how would I make a hollow "cone" with a wall thickness of 1/16"? I can't loft between two rings, it does not allow that.
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Member, User Group Leader Posts: 809 ✭✭✭✭✭
Bryan Lagrange

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Moderator, Onshape Employees Posts: 5,519
Shell to 1/16" - trigonometry states that the distance measured between the two "top rings" is not the same as the wall thickness.
Senior Director, Technical Services, EMEAI
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Member Posts: 3 EDU
I did find the solution and it is what bryan_lagrange linked, but slightly different. As NeilCooke said that the distance between the top rings is not the same as the wall thickness. The answer is: Make a sketch for a revolve action, and set the distance between the two rings, not the distance between the line.