1. Machining the datum surface first: When the part is in the process of processing, the surface as the positioning datum is first processed to provide a good reference for the subsequent processing as soon as possible, which is called the "baseline".

1. Rough scraping: If the surface of the workpiece is rough, the processing marks are deep or the surface is severely rusted, uneven or deformed, and the scratch margin is more than 0.005mm, it should be rough scraped first.

1. Put the cast iron floor plate on the ground, adjust the stability of the four corners, and fine-tune the movable feet to make it stable.

1. The production standard of the cast iron surface plate is produced according to the GB7947-1999 standard.

1. The used bench drills, electric drills, and grinders should be checked frequently. Any damage for welding platform should be reported and repaired in time, and it should not be used before repair.

1. Manual annealing: it needs to be annealed at 600-700 degrees in a tempering kiln.