Grinding “Pistol” For Finishing Fine Metal Work

Bay of Plenty Beacon, Volume 14, Issue 85, 13 January 1950, Page 6

Grinding “Pistol” For Finishing Fine Metal Work

An interesting novelty has been put on the market by a Swedish instrument manufacturing firm specialising in dental surgery equipment of various kinds. The new invention, which attracted great attention among experts at the recent St. Erik Fair in Stockholm, is an all-purpose machine for grinding, finishing and polishing hand-work-ed material in finer mechanics. This new Swedish tool, which is manufactured by A. B. Dentatus, of Stockholm, promises to revolutionise the tool or instrument maker’s job, by doing the work in a fraction of the time required by manual labour. The machine, which looks like a pistol, has a few simple working parts. It weighs only 0.4 kilograms (about lib.), and speed is regulated by foot, leaving both hands free. Tools are rapidly changed in notches at the muzzle. It works with an adjustable stroke velocity up to 10,000 r.p.m., while the stroke length can be regulated within a range of 0-6 mm. For polishing, the machine is switched over with a few simple movements from stroke thrust to rotation with a maximum radius of 6 mm. Hundreds of files, grinding and polishing wheels in the tool set permit the execution of a large variety of jobs. In stamping metal objects, requiring precision up to one-tenth of a millimetre, there will often be differences that must be filed away. In the fine-mechanical industry, this sort of work continues to a large extent to be done by hand, taking considerable time, but with the new machine it is done in a moment and results in greater precision.

A new type of plastic window shade, said to be practically indestructible, is on the' market in the United States. The shade is made of a special plastic film and is reportedly sun-proof, mildew-proof, and washable.