RAS Model 22.81 DuctZipper

Description

The RAS Systems Model 22.81 is a heavy-duty, German-engineered roll-former and duct seaming machine widely used in HVAC sheet metal shops. It is highly prized for its ability to form and lock the longitudinal seams of square or rectangular air ducts in a single pass. Because it is an older industrial workhorse (with vintage models dating back to the late 1960s), finding an exact PDF manual online can be challenging. However, operating and maintaining the 22.81 Duct seamer typically requires understanding a few core operational principles: Single-Pass Operation: The machine features 15 roller shafts with seaming rollers, plus 9 intermediate rollers in an overhead seaming bar. You feed your pre-bent sheet into the machine's guide, and it performs the roll-forming and seam-closing tasks in one continuous operation. Material Capacity: The standard Model 22.81 is generally rated for galvanized steel thicknesses between 0.5 mm and 1.0 mm (typically up to 20swg or 1.0 mm).Guide Rails & Fence: The machine utilizes a specific guide fence (often the WNS Pilot Guide Carriage) to align and feed the sheet edges at the perfect angle. Proper machine setup involves centering this guide fence to accommodate the specific width of the seam's flange. Maintenance: Routine service revolves around making sure all 15 roller shafts are properly lubricated and checking that the overhead seaming bar maintains uniform pressure on the seam. If you need replacement parts or are troubleshooting historical maintenance, you can check W. Neal Services for reconditioned manuals, spare guide fences, and technical diagrams. If you can tell me what specific problem you are troubleshooting (e.g., jamming, adjusting roller pressure, or aligning the seam lock), I can provide more specific mechanical instructions or guide you on adjustment procedures.