Daniel Chapman Stillson Daniel Chapman Stillson Daniel Chapman Stillson (March 25, 1826 - August 23, 1899) was an American inventor. He invented the modern adjustable pipe wrench. He was born March 25, 1826 in Durham, New Hampshire. He was the son of William Stillson and Nancy Chapman. He married Ellen Raynes Davis on April 18, 1855. He was a machinist during the American Civil War and served on David Glasgow Farraguts first voyage as a vice admiral. At the end of the Civil War, Stillson returned to Charlestown, Massachusetts, and eventually he moved to Somerville, Massachusetts. He then worked as a machinist at
Pneumatic tool always been ubiquitous in industrial and manufacturing Most pneumatic tools are to be supplied with compressed air at 4 to 6 bar. It is important to know some general specification technical terms used in pneumatic tools while it is also related to how to choose a good air compressor and if the tool can meet your job requirement so that an air tool can be used properly, respectively, Free Speed (rpm), Air Pressure(psi/bar), Air Consumption(cfm/scfm or m3/min), Horse Power(hp), spindle size, etc. Depending on different type of pneumatic tools, there are different specification values that you need to pay attention