How to Make Round Wooden Window Edges

Wooden windows usually have square, wooden, trimmed edges except around windowpane dividers, which often have a tapered detail. If you prefer a softer edge or corner, round the exposed window corners and trim them to fit the preferred contour. This is done without removing the window, although there is likely to be some handwork involved in some areas. If your windows and trim are not installed, this process is easier.

Router bit
Router
Scrap wood
Rotary tool
Sanding head

Instructions

- 1
  Place a selection of router bits on the worktable. Round corner bits are available in different corner radius and shapes. Install each available bit and run the hand-held router along test lumber’s edge of the same type wood as your windows. Select the profile you prefer. Use different profiles on different sections of the window and trim.
- 2
  Install the router bit. Typically, you will want to router the larger and more exposed corners first with a larger bit. Depending on the router model, some models do not allow starting close to an inside corner since part of the router is too bulky to fit into the corner. Start as close to the inside corner as possible.
- 3
  Hold the router flat with the top and side being trimmed. Move the router smoothly and evenly along the wood, finishing as close to an inside corner as possible. If the wood finishes with an outside corner, complete the round shape and run off the wood’s end. Complete all the routing on the window that your tool can reach.
- 4
  Clean up the inside corners and hard-to-reach places with a smaller hand-held rotary tool with sanding and filing bits. These let you remove wood and form the corner in areas too tight for the router.

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