(2) you must protect the operator from chips or chunks being thrown out while feeding the machine. choose whichever makes sense for your cash flow. i knelt on the double yellow lines and touched her shoulder. don't underestimate the power of the dry oil! hopefully these graphs can be used as a reference to check or estimate the values for a specific design. and also we did pattern making in salt tray (sorry i don't have the pictures) i made a pattern on a paper and asked her to do the same in salt tray. 