#spurebush

[toolengineering]

There are two basic designs of sprue bush which differ only with respect to the form of seating between the sprue bush and the nozzle of the machine. Both designs are shown in the figure. The first of these is a sprue bush with a spherical recess which is used in conjunction with a spherical front-ended nozzle as illustrated in the figure. The second has a perfectly flat rear face, the seating between it and its corresponding nozzle is shown in the figure.