What are these called?

danander11

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May 2, 2025
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Dothan
Sorry if this is a bit of a 'dunce-y' question, but I'm brand new to woodworking and such so I'm obligated to ask them.. ;-)

I have two doorways, (36" and 48"), that I have removed the doors from. The door frames are fairly robust and in good shape, so I've decided to just use a router to remove the door 'stop', and sanding smooth, giving the appearance of a passage instead of a doorway.

I want to make something to give the impression of an arched or arced passage rather than a rectangular 'hole' in the wall.. so I thought I'd craft up something 1-15" thick to fit into the upper corners of the frame. Simply a cosmetic bit that would serve no purpose other than to give the impression of an arc or arch.

What are those bit called? There has to be a name for them and it's driving me nuts that I can't sort it out.

I knocked up a quick drawing in cad with a very basic idea of what I want to do, (in white).

Can anyone tell me please? Thanks.
 

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If the door stop is milled as part of the side jamb it is very possible that you have what are called split jambs. When you mill away the stop you may be in for a surprise. Here is a typical illustration but there are variations out in the wild. (sorry for the fuzzy screenshot)

PeterScreenshot 2025-05-12 at 2.50.12 PM.png
 
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