Undercut
A pattern or model is said to be undercut when its lower dimensions are largest--exactly opposite to taper or draught. Such patterns may in some cases be rammed within a flask and withdrawn after reversing the whole, or the projecting parts may be made loose on the main block and drawn inward after the latter has been taken out. Another method is to proceed contrary to the usual custom and draw the mould from the pattern in as many sections or drawbacks as will allow the pattern to be lifted away from the remainder. See STATUE-FOUNDING; TAPER; DRAWBACK; FALSE CORE.