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Why is this sketch not fully defined?

lizardonabikelizardonabike Member Posts: 2

What am I missing here to fully define this sketch? This often happens to me when working with the arc tools.

https://cad.onshape.com/documents/c915cb97491c14ae5472069f/w/ee74a9f4bb562fab2dac401c/e/cef65e96c4a62227b8fcdae8?renderMode=0&uiState=69837869444dd394c1166766

Screenshot 2026-02-04 at 11.44.30 AM.png

Answers

  • Matt_ShieldsMatt_Shields Member, Onshape Employees Posts: 905 PRO
  • CADNurdCADNurd Member Posts: 52 ✭✭

    Arcs are segments of a circle and circles need to be given a size. Also, if you're planning on extruding something with ready-made fillets, that's generally not the way to go. Fillets are better added to the solid model at the very end.

    CADNurd's Linktree - find me everywhere else - https://linktr.ee/Liam.G

  • nick_papageorge_dayjobnick_papageorge_dayjob Member, csevp Posts: 1,050 PRO

    Put the dim to the flats of the box, not to the tangent points of the radii. That is the design intent 99.9% of the time. Then, put a separate dim for the radius. Set both radii equal to each other.

    I also agree with the comment to add the radii as a separate feature in 3D, instead of inside the 2D sketch, as a general cad principle,

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