Q. If an old casting is to be used as a pattern, to account for various allowances. (Solved)
1. to provide draw screws, holes can be drilled and tapped in the castings
2. the castings are cleaned and made smooth
3. casting is shaken while withdrawing from mould
4. the surfaces are lagged with thin strips of wood or leater
- d. the surfaces are lagged with thin strips of wood or leater