Mountz Inc. offers a cam-over torque wrench designed with a “Through Hole Spindle” for Pin Fastening applications, which cannot be gripped in the conventional manner. Fasteners such as HI-LITE®, AERO-LITE® and VERI-LITE®, are threaded pins with a close tolerance design intended for applications where aerodynamic and precision fastening is required. These ‘blind’ fasteners are increasingly being used in the aerospace industry.

Accurate tightening of blind fasteners can be achieved with this innovative torque wrench. The “Through Hole Spindle” design of the wrench makes it simple for the operator to use and ensures precision torque control. The “Through Hole Spindle” torque wrench operates by having a hexagon key is passed down the axis of the square drive shaft to hold a fastener in position while its securing nut is tightened by an operator using the torque wrench.

The “Through Hole Spindle” torque wrench is a pre-set torque wrench that’s ideal for maintenance and production applications where over-torque conditions are not tolerated. Built with a cam-over design, the accurate torque wrench prevents a fastener or bolt from being over-torqued. The design action of the cam-over torque wrench is such that when the tool reaches its pre-set torque value the mechanism disengages from the drive thus limiting the torque applied. Designed for variety of industries like aerospace, automotive, electronics, energy, medical, and packaging, the Mountz Inc. cam-over torque wrench ensures proper torque control.

A pre-set torque wrench is similar to a person setting an alarm clock to signal the achievement of a selected time. The torque wrench is pre-set to the required torque value of the application and then the tool signals the operator when torque is achieved.

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A brushless rotary torque sensor is a finely tuned instrument designed for monitoring and testing torque applications where accuracy and reliability rank paramount. Designed for torque evaluation and verification, the brushless rotary torque sensor is a laboratory grade instrument that is commonly used for quality control, R&D and calibration applications.

For use with most power tools, high RPM tools, or rotational torque measurement applications, a brushless rotary torque sensor provides a higher level of accuracy over other standard rotary torque sensors. By connecting a brushless rotary torque sensor between an electric or pneumatic tool and an assembly application, you can monitor the torque being applied from the tool to a fastener or bolt. The torque sensor plugs into a torque tester or torque meter to display and capture the torque readings.

This special class of torque sensor is particularly valuable for measuring torque on pulse tools with strong vibrations. When using a standard rotary torque sensor for testing a pulse tool, there is a common “brush bounce” that plagues the testing accuracy. A brushless rotary torque sensor solves that issue and delivers consistently accurate readings ? whereas brushes within standard rotary torque sensors can bounce on the armature slip rings, which can impact the accuracy of the torque readings.

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During the assembly of parts using an electric torque screwdriver there are many things to consider to achieve proper torque control. Is the joint hard or soft? The material that is being used? Is the screw lubricated or treated with a locking patch? One factor that’s often overlooked when using an electric screwdriver is the RPM setting of the tool.

Will changes in RPM have a net effect to the torque applied to a joint?
The answer in short is yes. RPM settings can be a contributor as to the torque applied to a joint.  There are a number of variables to consider. A best practice is to document the settings and ensure they are not altered after all has been set and validated. It is important to ensure the same settings are used when validating calibration and making correlations.

A few of the variables are as follows:
- Higher RPM, less energy is applied at the joint as the force is present for a shorter period of time.
- Higher RPM may result in increased inertia, although the net differences are dependent on the mass of the force being generated.

- Lower RPM, more energy is applied at the joint, as the force is present for a longer period of time.
- Lower RPM can result in less inertia, although the net differences are dependent on the mass of the force being generated.
 
In some scenarios, the net differences may be negligible, while in other scenarios, the net differences may be more significant. Due to these and other variables, it is best to check the residual torque at the joints and develop a formal and consistent plan for setting and validation.

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A helicopter manufacturer had a critical torque application during the routine maintenance process of their aircraft. The rotor of the helicopter requires servicing after every 20 hours of flight. Some of these aircraft are serviced in very remote locations, where air or power is not readily available or reliable. Ensuring proper torque control is achieved for the rotor assembly nut is a critical element for maintaining the continuous safe operation of the helicopter.

The director of maintenance contacted Mountz Inc. and explained the application requirements. He inquired about cost effective torque control options that were available to ensure the quality and safety needs of their critical fastening application were satisfied.

The impact wrench lacks torque control and is destructive by nature with its “hammering” design. These tools are not ergonomically friendly for a technician and require a high maintenance budget. Also with some locations being remote, access to power would not be possible. Therefore, an impact wrench was not an option.

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