Practical application of impact drivers In recent years, the use of impact drivers to drive in timber screws has become more and more popular. This is mainly due to ergonomic benefits for users. While users are subject to high torques when using drill drivers, less force is required to guide an impact driver. This becomes particularly evident with larger screw dimensions. An easier process to drive in wood screws is a clear benefit particu - larly in difficult installation situations . This includes situations when working overhead, installing screws in hard-to-reach spaces or when the driving tool can only be held with one hand. However, in certain situations, there is a risk that timber screws may be under too high loads during installation with an impact driver. Excessive loads may lead to a reduced load capacity of the timber screw and, in extreme cases, to the complete failure of the corresponding screw connection. This is why this booklet contains important recommendations for the cor- rect installation of ASSY ® screws with an impact driver. What is an impact driver in the first place? Impact drivers as described in this brochure are tangential impact drivers that release blows in the direction of rotation once a certain torque is reached when driving in the screw. These blows, which act tangentially to the direction of rotation, lead to the aforementioned relief in application, since no constant torque is acting on the user but rather an impulse-like torque in a rapid sequence of stress and relief. Do not confuse such tan- gential impact drivers with devices such as impact drills that release axial blows in direction of the screw axis. On principle, any device with an axial impact is entirely unsuitable for processing wood screws. Driving in screws with an impact driver is particularly suitable for • . larger screws • . serial installation • . overhead work • . one-handed guiding of the driving tool • . hard-to-reach spaces 2 ASSY ® screws: installation using an impact driver
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