That may be difficult on older painted doors.
Plane hinge side of door.
On many doors the grain runs from top to bottom instead of side to side.
Immobilize it with a doorstop and plane it in place see step 3.
Complete one pass per stroke with a hand or power planer with.
The hinge master mortising jigs have been designed to route most of the various hinge sizes of todays door industry.
Turn the door so.
But for maximum control and to plane longer portions take the door off its hinges with a screwdriver or drill.
Step 2 use your ruler to measure 1 8 inch from the jamb to the start and end points on the door.
Before trying to trim the door open it and examine the hinges.
The radius of the mortise is determined.
Test each screw by tightening it with a screwdriver.
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.
People usually try to plane off the edge.
But frequently the solution is on the hinge side.
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.
Running the plane in this direction will create smooth cuts instead of chunky bumpy cuts.