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Drilling experts at work

 

New cordless hammer drill from Bosch made of Ultramid®

 

They are a dream come true for do-it-yourselfers, and an essential tool for professionals who have to use them every day: advanced-technology power tools such as hammer drills. Legislation has been passed stipulating how much these tools are allowed to vibrate so as to minimize the vibrations that reach the arm. The new, especially lightweight and low-vibration cordless hammer drill GBH 36 V-LI Compact Professional made by Bosch weighs a mere 2.9 kg and, at 12 m/s2, has a low vibration value that reduces fatigue during work.

 

Low vibration, less weight.

 

In the latest version of the cordless hammer drill with Bosch Vibration Control developed by Bosch, the front section of the impact mechanism is largely detached from the handle section at the back. While anelastomeric bellows at the top serves to cushion the motion of the impact mechanism, the plastic housing on the handle below has the function of a joint. Bosch decided to make this housing out of the plastic Ultramid® B3EG7, one of BASF’s very rigid and impact-resistant glass fiber-reinforced grades of polyamide 6 that meets the high demands made in terms of durability.

 

This demanding application led Bosch to look for a plastic that could withstand the continuous oscillating load exerted on the lower joint over the long period. In particular, the impact resistance and the durability of Ultramid B3EG7 allow it to fulfill these requirements during the entire service life of the hammer drill. In addition, this plastic is UL-listed (Underwriters Laboratories), so it can be used in power tools earmarked for the American market. BASF’s applications engineers assisted in developing the product by conducting numerous experiments, including vibration tests on a shaker – which is normally used for cylinder head covers. They also carried out X-ray examinations to detect crack formation, they tested mold filling behavior and they conducted shrinkage and warpage tests during the 3-component injection molding process, which is a challenging injection molding operation. This plastic is globally available and BASF colors it in the shade of blue that is typically associated with the Bosch company.

They are a dream come true for do-it-yourselfers, and an essential tool for professionals who have to use them every day: advanced-technology power tools such as hammer drills. Legislation has been passed stipulating how much these tools are allowed to vibrate so as to minimize the vibrations that reach the arm. The new, especially lightweight and low-vibration cordless hammer drill GBH 36 V-LI Compact Professional made by Bosch weighs a mere 2.9 kg and, at 12 m/s2, has a low vibration value that reduces fatigue during work.