Used for installing switching mechanisms on railway lines, the drill press to which this torque limiting coupling is attached sinks large screws into railroad ties made of various materials such as steel, concrete, plastic and wood. Each material requires a different size of screw and a different amount of drive torque. The railroad workers are able to manually adjust the slip torque setting of the coupling to the value needed for each material by loosening or tightening the adjustment nut. The output shaft allows for the quick interchange of sockets to accommodate the various screw sizes.
Mach III provides rapid turn-around for application adapted designs. This torque limiter was designed and quoted within 24 hours of the initial discussion between the client and our engineers. The units were manufactured within 3 weeks.
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Used on to raise and lower an antena on a military vehicle, this torque limiter coupling is exposed to the elements. Stainless Steel contruction assures that it up under the harsh conditions. The torque limiter portion fits a 1.0 Inch Square, the coupling portion fits a 0.75 Inch Square. The torque limiter protects the driven shaft by slipping if the factory torque setting of 1,800 pound inches is exceeded while the antena is raised.
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This mechanical friction torque limiter was created in response to a customer’s request for a slip clutch with a 3180 pound inch setting and a 44L100 pilot mounted pulley. The first challenge of this application was that the outside diameter of the torque limiter could not exceed the diameter of the pulley. Mach III designed this unit with eight friction surfaces to deliver the required torque within the diameter restriction.
The second challenge was that the unit had to fit on a 1.25 Inch shaft. The design could accommodate a 1.25 inch bore, but there was no room for a keyway. Mach III extended the drive hub and fitted it with a locking collar to connect the torque limiter to the shaft.
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An arm used to position components during the assembly of an aircraft had problems with overload when it went into use. The arm was articulated by a timing belt pulley located at the pivot point that was driven by a belt connected to the motor. Extra load put on the wing assembly transferred backward through the arm to the motor. A torque limiter would resolve the issue, but there was only one inch of axial space available between the pulley and frame in which it could be placed.
Nothing existed that was that thin and would deliver the needed 530 pound inches of torque required. It appeared redesign and rebuilding of the arm might be the only option, one which would be both time consuming and costly.
Luckily, Mach III’s engineering team figured out how to combine the timing belt pulley and torque limiter into one component. Nothing had to be moved; even the belt position was maintained. Just as remarkable, Mach III expedited production to keep the maker of the assembly arm out of hot water with their client. Only 12 days after the application was presented to Mach III, 5 complete torque limiter/pulley assemblies arrived onsite.
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Mach III was contacted by a facility which uses large manually operated control valves. The quarter-turn valves are driven through right angle worm reducers by hand operated chain wheels. Due to the unfortunate fact that human beings are not equipped with torque sensors in their muscles, costly downtime failures were occurring when excess force was applied to the worm reducer via the chain wheel. Working with the facility's engineer, Mach III designed a special, keyless, friction torque limiter to connect the chain wheel to the reducer shaft.
In addition to designing and manufacturing the torque limiter, Mach III also provided the customer with a mounting diagram including suggested dimensions for machining their existing chain wheel to accept the new device. Although Mach III offers the service of machining existing mating components, in this case the customer's shop felt comfortable with the task. The torque limiter was successfully installed and adjusted to a setting where it would slip to protect the worm reducer when the shop gorilla swings on the chain.
Those accustomed to working with other clutch suppliers might assume that only an application promising considerable quantities would merit this level of attention. But this customer needed only three torque limiters, and spent just about one thousand dollars. So what is the motivation? A report from the customer that the new system "worked perfectly".
If you've got a nagging issue needing a clutch, brake or torque limiter solution and are concerned that no one will think it's worth their while, give Mach III a call. We know you will be pleasantly surprised.