Scribing method for rear stern shaft bracket steel casting

The invention discloses a scribing method for a rear stern shaft bracket steel casting. The scribing method comprises the following steps that S1, lofting is conducted, specifically, a plane lofting drawing of a rear stern shaft bracket is compiled; S2, leveling is conducted, specifically, the rear stern shaft bracket is hoisted to a scribing platform and corrected to be horizontally placed; S3, center line scribing is conducted, specifically, center lines of a shaft hole, an arm and a center plate are scribed on the rear stern shaft bracket according to the plane size annotated by the plane lofting drawing; S4, clamping plate manufacturing is conducted, specifically, clamping plates consistent with the shaft hole, the arm and the center plate of the rear stern shaft bracket in actual shape and size are manufactured according to the plane lofting drawing; and S5, scribing is conducted, specifically, the clamping plates are checked according to the center lines on the rear stern shaft bracket, and the parts wh