How to extrude from a curved surface and maintain the curve on the extrusion?

andrew_betts007

Hi!  This is my first post - I'm loving onshape and starting to become more ambitious

https://cad.onshape.com/documents/d13858c1b20695847c472d84/w/4d790ef02743da1e473d60f4/e/3c92ef2a76d2b2e85a059959

I'm working on this part, it's a hanger for a roll of tape to fit an IKEA SKADIS pegboard.  I'm using it as an exercise in learning OnShape.



I want to add a ridge to the edge of the curved surface on top and opposite to the hook side (so the ridge should be close to the viewpoint of the view above).  This is to hold the roll of tape in place - it's being held on one side by the body of the hook, and it needs something to hold it on the other side.

I've seen various solutions discussed for how to extrude from a curved surface, like starting the extrusion from inside the part (don't think I can do that here because the starting point would be below the inner curve), or extruding down from a higher plane "up to face" (but then the starting face of the extrusion doesn't follow the same contour as the curve you're extruding up to).  I also considered making the curved bit into a revolve, but I'm not sure how I could create the sketch for that, because the point that the curve starts is not a right angle (instead the curve is projected out from the line of the diagonal brace).

I hope this all makes some sense.  I just want to hold my roll of tape in place .

glen_dewsbury

Here is a simple way using a ruled surface. One of a few that come to mind.
https://cad.onshape.com/documents/3e19ad4870330b7ef4b191e4/w/b06e0b96532073c80c543d21/e/81c45ee4b76d35e20ea06b20

john_lopez363

A very simple way is to Sketch the shape you need on the outside face of the curved part and do another Extrude add.

 

rafael_telgmann

you could split and move the face. 

glen_dewsbury

Here is a simple way using a ruled surface. One of a few that come to mind.
https://cad.onshape.com/documents/3e19ad4870330b7ef4b191e4/w/b06e0b96532073c80c543d21/e/81c45ee4b76d35e20ea06b20

john_lopez363

A very simple way is to Sketch the shape you need on the outside face of the curved part and do another Extrude add.

 

rafael_telgmann

you could split and move the face. 

andrew_betts007

This is such an amazingly helpful set of responses.  I'm incredibly grateful, thanks!