Main gallery page Castings In Action Slideshow   Line Launcher Tube for Military Use << Start < Prev 1 2 3 4 5 6 7 8 9 10 Next > End >> Description To achieve the vents needed for this aluminum investment-cast part, 16 1-inch vent holes and four vent slots were machined into the wax patterns prior to setup and investment of the assembly. Waltek Inc., Ramsey Minn., is the casting supplier. Comments No Comments Yet!  Add Comment Your Name: Your Comment: