Pit molding
1. Very big castings which cannot be made in flasks are molded in pits dug on the floor.
2. Very large jobs can be handled and cast easily through pit molding.
3. The mold has its drag part in the pit and a separate cope is rammed and used above the (pit)
drag.
4. The depth of the drag in pit molding is much more than that in floor molding.
5. In pit molding, the molder may enter the drag and prepare it.
6. A pit is of square or rectangular shape.
7. The sides of the (pit) drag are lined with brick and the bottom is covered with molding sand
8. The cope (a separate flask) is rammed over the pit (drag) with pattern in position.
9. Gates, runner, pouring basin, sprue etc. are made in the cope.
10. The mold is dried by means of a stove(heater) placed in the pit.
11. Cope and drag are then assembled. A crane may be used for lifting and positioning the cope
over drag.
12. Cope can be clamped in position.
13. Mold is ready for being poured.