Original article date: October 1999
There’s much more to torque control than turning up with an impact wrench, as Alan Quinn found out from MHH Engineering
When a bolt is tensioned correctly, it is working at optimum efficiency and will resist coming undone. However, if the tension is too low, the nut could vibrate or work loose. [...]
Original article date: September 1997
German company FAG has become the first bearing manufacturer to recommend the use of adhesives for bearing assembly in its own literature.
Roller bearings are usually secured into a housing or onto a shaft be means of an interference fit, which is achieved by press-fitting or shrinking the components. The push-out force [...]
Original article date: March 1999
Ultrasonic welding is a versatile process which can be used to join a wide range of thermoplastics. Jerfurth’s BRIAN SMITH explains how to avoid some of the more common pitfalls.
The process of ultrasonic welding is not just about joining long sections of rigid thermoplastics- It can be used directly and indirectly [...]
This article was originally written in the period 1995-2000
Assembling cylindrical parts with adhesives requires sophisticated bonding technology. Retaining compounds join circumferential assemblies.
Design benefits of adhesives
Eliminate bulk needed for high friction force
Augment or replace press fits
Reduce machining costs
Combine materials for the best properties of each
Eliminate distortion when installing drill bushings
Produce more accurate rigid assemblies
Increase strength of [...]
Original article date: April 1998
A square self-clinching fastener said to cut assembly time of thin aluminium sheets by up to 80% has been unveiled.
Faced with the need to attach thin metal sheets too thin to tap, how best to provide permanent load-bearing threads, while reducing the amount of required hardware and time required for installation?
Broadly [...]
Original article date: April 1999
The critical weakness in many products is the joints. Bolted joints in particular can be a source of concern for the engineer. In spite of the term ‘nuts and bolts’ being used to describe the simplest aspects of a particular topic, bolted joints are far from simple. They are not easily [...]
This article was originally written in the period 1995-2000
Paul Brackell of Townsend Coates covers the basics of a technique which is often overlooked – resistance welding can be the answer to joining small parts together
The four basic bonds
Braze/soldered bond:-resistance heating of the workpieces produces sufficient heat to melt a third metal, such as gold or [...]
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