A hinge can often work loose binding the door against the frame.
Plane hinge side of door.
But frequently the solution is on the hinge side.
On many doors the grain runs from top to bottom instead of side to side.
That may be difficult on older painted doors.
Immobilize it with a doorstop and plane it in place see step 3.
People usually try to plane off the edge.
Use a pencil to mark this area on the side of the door not on the edge.
Test each screw by tightening it with a screwdriver.
Before trying to trim the door open it and examine the hinges.
Step 2 use your ruler to measure 1 8 inch from the jamb to the start and end points on the door.
The hinge master mortising jigs have been designed to route most of the various hinge sizes of todays door industry.
Plane the hinge or lock sides of the door in the same direction as the wood grain applying light pressure to remove very small amounts of wood at a time.
But for maximum control and to plane longer portions take the door off its hinges with a screwdriver or drill.
Complete one pass per stroke with a hand or power planer with.
The radius of the mortise is determined.
Run a piece of thin cardboard or folded paper in between the door and the jamb to identify the start and end point for the area that needs to be planed.