Roll Pin Punches: Uses and ApplicationsMay 28, 2018
What is a roll pin? There’s a simple answer to that question, which is just as well because we need to get back to the issue at hand. Roll pins are cylindrically shaped fasteners. Forced through aligned openings, the pins anchor boreholes and lock them in place. As for Roll pin punches, well, these are the tools that transmit the impact force, straight to those tension-loaded cylinders.
Regarding Roll Pin Geometry
Chamfered on either end, the hollow pins are clearly meant to slot into a similarly shaped opening. Truth be told, the diameter of the holes on these parts is always slightly smaller than the diameter of the approaching roll pin. Look closer, there’s a gap running along the length of the cylinder. It’s this break that imparts tensioning strength to the fastener. Driven in until the chamfered end is pushed into the smaller opening, the cylinder compresses. However, it’s not easy to hit this pin just so, not without bending it or flattening the chamfer on the impact end, which is where this specialized punch family comes to the rescue.
Roll Pin Punch Applications
So where does a roll pin await the impact of a hollow punching tool? Swinging parts and impact-heavy pistons use many of these fasteners. A hinge on a cabinet or door, lubricated and solidly manufactured, reveals several hollow pins as the wooden panels swing open. Automobile transmissions, loaded with rotating parts, also sport rows of roll pins. Gunsmiths, hydraulic valve manufacturers, and wristwatch makers, all of these applications rely on these hollowed out punches. On a rifle, for example, pins snap home on a firing mechanism or a trigger guard. On a desktop lamp, the articulating hinge utilizes a similar mechanism. And in a car’s transmission, coupling shafts and shifter rods gain countersunk couplers, again because of the presence of a pouch full of differently sized roll pin punches. From coupling rods to gears, weaponry parts to furniture hinges, the inverted shafts direct focused impact energy straight to the tensioning cylinders.
Designed specifically as an impact link, a force delivery system that bridges large mallet heads and finely wrought roll pins, this punch family prevents the thin pins from bending or breaking. In application, that hammer or mallet drops, the power strikes the hardened roll pin punch, and the inverted cylindrical rod fits like a glove around the spring-loaded pin. As force is imparted, the tool makes sure all energy is directed straight down the fastener, where it drives the hollow pin into an undersized borehole.
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