Scaled in - If the gibes/ways aren’t smooth flat. We would take a perfectly flat plat and cover with lay out blue (a blue spotting past) than ran across the surface were the blue stick/show we gently hit them with a grinder. Than repeated many time to come out with a smooth surface. Also called scraping.
We did this with all component steel bottom before assemble also.
Sorry if I am not clear. That is why I never wanted to train apprentices as I am a doer not a teach with no patience. That is just another reason I have nothing but respect for @ReikoX. He explains so well and if you don’t get it he tries another way for us. He is a Saint as far as I am concerned like my first Journeyman.