Heavy Duty Air Shrinker/Stretcher The HDAS-4 Air-Operated Sheet Metal Shrinking/Stretching Machine was developed for the use of fabricating and repairing all types of sheet metal, and some extruded aluminum sections. The machine works by either shortening or lengthening the metal to the desired shape, contour, or fit. The HDAS-4 has a heavy cast iron C-frame with a 12” throat and is mounted on a welded steel stand. Throat depth is measured from the tooling center-line to the rear of the throat. The machine comes with one set of jaws (either shrinking or stretching), and can be fit with many different sets of mechanical jaws for working channel or odd sections. The machine’s power is derived from an air cylinder which operates through a toggle linkage and a simple lever. Power is thus transmitted from the air cylinder to the upper jaw which moves up and down at the front of the machine. The lower jaw is obviously stationary. The machine is provided with a foot-operated switch, and also a cut-out button, which is mounted at the front of the machine stand, below the frame, on the right hand side. Pressing the pedal quickly one time makes the machine cycle completely one time. The machine automatically completes one cycle and then stops at the top of the stroke, leaving the jaws in the open position. By stepping and holding the pedal down the machine will give repeating cycles until the pedal is lifted, and it will again return to the top of the stroke. A hand screw is provided at the upper jaw, either to adjust the pressure of the stroke, or to adjust for different metal thicknesses. .120” mild steel is the limit for this machine, using the 90 psi allowable maximum air pressure. Exceeding the maximum 90 psi air pressure will damage the machine and void all and any warranties This machine may be converted to a stretching machine by replacing the shrinking jaws with stretching jaws. Neither special skill nor special tooling is required in making this change. Simply pull the upper and lower “U” pins and nudge the jaw assemblies up and out of their grooves. Attention should be given to how the jaws are positioned in the machine with regards to each other. Even though the jaws may be installed with their fronts facing either way, usually the best results are obtained by installing them with the locking pins facing out, so that the shorter jaw is opposite the longer jaw. The HDAS-4 Features • 90 PSI shop air • 12-inch throat • Easy jaw change from stretch to shrink • Will shrink or stretch .100 mild steel. • Two switch settings allow for either a single stroke with each press on the foot pedal (shown), or a constant cycling at 50 strokes per minute just by flipping a switch. • Top screw adjusts pressure of jaws by closing the gap between them. • Comfortable working height. • Machine comes standard with foot control and stand. 7 Sets of jaws included with machine.