9. Start a sketch for the string bridge on your tube

• Select the sketch tool
• Click the bottom face of your tube to start sketching on that face
• Right click and select View normal to sketch plane to line up your view

10. Start to draw the string bridge

• Select the Use (Project/Convert) tool
• Click on the inner circle
• That line will bold, as it becomes part of your sketch

11. Draw the bridge

• Select the Line tool
• Click on the left side of the inner circle
• Click on the right side of the inner circle
• Right click and select escape line
• Repeat to draw a second line below the first

12. Dimension the bridge

• Select the dimension tool
• Click the first line, then the second
• Set the dimension to 0.1
• Select the Equal tool
• Click on each line to make their lengths' equal
• Did you notice how the lines turned black? »
• Black lines mean, “fully defined,” which means that you have told Onshape exactly where the line is.
• If a line is blue, it means that there are still things to be constrained or dimensioned.

13. Finish the sketch

• Select the "Trim" tool
• Select the part of the circle outside the lines
• On the top
• On the bottom
• Click the green check to finish the sketch

14. Extrude the bridge

• Select the extrude tool
• Click on "Sketch 2"
• Click on Add to add to your part instead of creating a new part
• Set the Depth to 0.25 in
• Click the "Opposite direction" button to make the bridge go inside your tube
• Click the green check

15. Strengthen the bridge with fillets

• What is a fillet? »
• Fillet: “a rounding of an interior or exterior corner of a part design.”
• Select the "fillet" tool
• Set the radius to 0.05
• Click the 4 edges of your bridge
• Click the green check

Nosecone Tutorial
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