Precise wood cutting

I'm having trouble cutting a wooden plank accurately. From the edge 40mm across the grain, turn at right angles (along the grain) 25mm and back to the edge, across the grain 40mm. These are cuts perpendicular to the plane of the board. Does anyone have experience with woodworking like this?

I'm having trouble cutting a wooden plank accurately. From the edge 40mm across the grain, turn at right angles (along the grain) 25mm and back to the edge, across the grain 40mm. These are cuts perpendicular to the plane of the board. Does anyone have experience with woodworking like this?

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