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Control of the Clamping Force in Production

Posted by Mountz Torque April 10th, 2013 0 Comments   
Torque Screwdriver

The clamping force is the main factor that is needed in controlling a fastened joint. Unfortunately, for large-scale production, no particular method has yet been developed to allow us to do this. Therefore, instead we must control other parameters that influence the clamping force. In this day in age, the most common method of controlling the clamping force is to control the installed torque to which the fastener is tightened.

Controlling the Installed Torque
The reasons for the widespread use of this method are mainly historic. In the past, accurate control of the clamping force was not so critical because products tended to be over engineered (by today’s standards), controlling the tightening torque proved to be a satisfactory method of ensuring joints did not fail. Also, it has been a tradition that most quality checks have been made separate from, and after, the assembly operation. The torque is a parameter that quality inspectors can check after the event.

Relationship Between Installed Torque and the Clamping Force
It’s important to realize that in a typical joint only about 10% of the energy spent in turning the fastener is actually converted into the clamping force. The other 90% is lost in friction. It’s very important to be aware that any changes of friction in the joint have a great effect on the clamping force. For example, if the average coefficient of friction in the joint changes from 0.10 (lightly oiled) to 0.18 (dry). For the same installed torque, the clamping force is reduced by 50%.

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Topics: Apply How to
 

Adjustable Torque Wrench Reduces the Likelihood of Warranty and a Rework

Posted by Mountz Torque March 29th, 2013 0 Comments   
Adjustable Torque Wrench

Mountz, Inc. introduces new ATB torque wrench models that are designed for low torque applications. The adjustable torque wrench breaks over upon reaching the preset torque value and resets automatically. The ATB wrench reduces the likelihood of warranty and a rework by assuring process control through accurate and repeatable torque control. The wrench is designed for variety of industries like aerospace, automotive, electronics, energy, medical, and packaging.

The ATB torque wrench is fast and accurate to set the using the quick and clear-to-read micrometer setting scale. The accurate torque wrench reduces the risk of a fastener or bolt from being under and over tightened. The unique breaking mechanism allows an operator more time to react once the target torque is achieved.

Once the break-over wrench achieves torque, the head breaks-over signaling to the operator to stop applying torque to the fastener or bolt. At the set torque, the handle of the ATB wrench moves through an angle of 20º before resetting. The use of a break-over torque wrench offers more accurate and repeatable results than a standard ‘click’ type wrench. A click wrench typically breaks about 3 degrees after set torque is reached and then becomes positive. If the operator continues to pull on the click wrench, he or she can over tighten the fastener.

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Topics: Apply
 

Ensure Accurate, Proper Torque Control is Applied to Fasteners with Small Cam-Over Torque Wrenches

Posted by Mountz Torque July 20th, 2011 0 Comments   
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In maintenance and manufacturing applications where consistent and accurate torque control is absolutely necessary, Mountz, Inc. offers the TSC & TSP Cam-Over Torque Wrenches. These torque wrenches are designed to deliver reliable and precise torque control for torque applications that do not tolerate over-torque conditions. Improper torque control increases manufacturing costs and delays. Designed for variety of industries like aerospace, automotive, electronics, energy, medical, and packaging, the TSC & TSP torque wrenches ensure proper torque control.

Built with a cam-over design, the accurate TSC & TSP torque wrenches prevent 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 preset torque value the mechanism disengages from the drive thus limiting the torque applied.

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Topics: Apply
 

Demystifying Torque

Posted by Mountz Torque January 5th, 2011 0 Comments   

To many manufactures, the concept of torque is a mystery. Ask them to describe the physics of torque and you’ll likely meet a blank stare. Cracking open a dictionary won’t help much either. To the layman the definition reads like a foreign language that owes more to mysticism than science. Despite the confusion, proper control of this mysterious force remains a critical component for quality manufacturing and has a direct impact on the bottom line issues like product quality, reliability and safety.

THE IMPORTANCE OF TORQUE CONTROL?
The reliability of machine parts subjected to fluctuating loads and stress depends on the fatigue strength of the materials. A threaded fastener, however, relies upon an elastic interaction between the mating components. Its objective is to clamp parts together with a tension greater than any external force trying to separate them. The bolt then remains under almost constant stress and is immune to fatigue. If the initial bolt tension is too low, the fluctuating load in the shank in much greater and it will quickly fail. Reliability, therefore, depends on correct initial tension and is ensured by specifying and controlling the tightening torque.

To read more – download whitepaper PDF

Topics: Measure
 

Too Loose or Too Tight? 10 Steps to Torque Control

Posted by Mountz Torque November 3rd, 2010 0 Comments   

In the manufacturing and assembly world, tightening, controlling, or measuring torque on fasteners is imperative for production efficiency. An inadequately torqued fastener can vibrate or work loose; conversely, if the tension is too high, the fastener can snap or strip its threads. Faced with these problems, manufacturers are realizing that precise torque control can spell the difference between a safe, reliable, and economical product and complete disaster.

“Anybody who has to tighten a threaded fastener and needs to control, monitor, or measure torque needs sophisticated torque tools,” according to Brad Mountz, President/CEO of Mountz Inc. “Likewise, if OEMs want to save money, make their workplace safer, enhance product quality, or reduce their exposure to liability; only specialized high-quality torque tools will get the job done properly.”

The following 10 tips for achieving precision torque control will give OEMs vital information needed to streamline their production processes:

1. Determine Torque Requirements
When determining correct torque specifications, the engineer must consider the maximum load placed on the fastener, the strength of the material joined, and whether the joint is hard or soft. A hard joint connects materials directly. In this case, the fastener rotates very few degrees to develop full clamping force after it encounters the material. Since a soft joint contains a gasket or involves compressible materials, it requires additional tightening after the fastener makes contact, to achieve full clamping force.

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Torque Tool Box