A circle of the diameter of your mill that is offset by half the endmill diameter, on a 45 or 135° angle, but they take more time to draw:

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The most basic model of dogbones is : drilled circles of the diameter of your end mill on the corners of your piece. But this requires a separate operation to drill them, as the rectangle's tool path can't reach such shallow regions.

For those of you who are working in Fusion 360, there is a super handy free Add-In we advise you to download, that creates dogbone automatically !

The true optimal dogbone solution is to make them a little more discreet and integrated in the contour/pocket operations of the shape for that they need to be done like this :

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Whenever you want to joint 2 pieces using mortises and tenons, you will encounter a problem: your mill is round and can’t make square holes.

_If you are using a lot of dogbones in your designs, we also recommend this more advanced Add-in : Nifty Dogbone. It is not very expensive and will manage updatable dogbones on any complex designs.