Frequently Asked Questions (FAQ)

Frequently asked questions about telescopic rails, linear guides, precision couplings, connecting shafts, etc.
Here you will find the answers to HA-CO's products.

Telescopic rail guide / linear guide, what is the difference?

Telescopic rail guide
Telescopic slides are slides which can be telescoped from their closed position to a longer, open position. Such types of rails are often used when you need to gain access to something (e.g. the contents of a drawer). Because there are usually roller ball bearings between the rail elements, telescopic rails require only a small amount of moving force, even at maximum load.

Linear guide
In linear guides, a carriage is moved in the closed rail. Linear guides are most often used in applications where precise movement is more important than easy access. When the load is centered on the carriage, linear guides are more effective. If the load is not centered, it is possible that the load value will be significantly reduced due to the short length of the carriage and the moment load applied.

What is a safety coupling?

Safety couplings separate the input and output of a drive train from each other in the event of an overload and thus protect against damage to the drive components.

Excessive and uncontrolled torques can lead to damage in the drive train, and in the worst case even to machine downtime. Production interruptions in high-quality plants and long machine downtimes after collisions, as well as high spare parts costs, should be prevented at all costs today, especially in our time of "just-in-time". To prevent this, safety couplings are used; in the event of an overload, the input and output of a drive train are separated from each other within milliseconds. In order for the torque limiting clutch to know when an overload condition occurs, a specific torque value is defined at which the clutch triggers disengagement. This value is referred to as the disengagement torque.
Safety clutches are also referred to as overload clutches or torque limiters.

For what and where are safety couplings used?

There are various couplings, safety couplings, metal bellows couplings, elastomer couplings, spring bar couplings, cross slider couplings, rigid couplings and spacer couplings.
In mechanical engineering or drive technology, the coupling is a machine element that reliably transmits torques and limits them to a defined value.
Couplings are used in a wide range of applications, including mechanical engineering, railroad and traction technology, medical technology and the aviation industry.