منابع مشابه
Motion Characteristics of high performance rotary tables for cnc machines
In this paper, the characteristics of two rotary tables driven by worm gear and roller gear cam are measured and compared. The positioning accuracy and repeatability as specified in ISO 230-2 are measured together with the rotational fluctuation, backlash, friction torque, frequency response of the systems and also the influence of unbalance mass on rotational motion. Two rotary encoders which ...
متن کاملEncapsulated ball bearings for rotary micro machines
We report on the first encapsulated rotary ball bearing mechanism using silicon microfabrication and stainless steel balls. The method of capturing stainless steel balls within a silicon race to support a silicon rotor both axially and radially is developed for rotary micro machines and MEMS ball bearing tribology studies. Initial demonstrations show speeds up to 6.8 krpm without lubrication, w...
متن کاملMolecular machines directly observed by high-speed atomic force microscopy.
Molecular machines made of proteins are highly dynamic and carry out sophisticated biological functions. The direct and dynamic high-resolution visualization of molecular machines in action is considered to be the most straightforward approach to understanding how they function but this has long been infeasible until recently. High-speed atomic force microscopy has recently been realized, makin...
متن کاملOptimization of High - Speed Multi - Station SMTPlacement Machines Using Evolutionary
| Surface Mount Technology (SMT) is a robust methodology that has been widely used in the past decade to produce circuit boards. Analyses of the SMT assembly line have shown that the automated placement machine is often the bottleneck, regardless of the arrangement of these machines (parallel or sequential) in the assembly line. Improving and automating the placement machine is a key issue for ...
متن کاملA Contactless Axis for High Speed Cutting Machines
Machine tools require linear guides with high stiffness and damping at high feed rates. At the same time, a high position accuracy is essential. The linear guides used together with linear direct drives in High Speed Cutting (HSC) Machines have to fulfill these premises along with the necessity to support the high normal forces of a direct drive. Large frictional forces and high wear result fro...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1914
ISSN: 0036-8733
DOI: 10.1038/scientificamerican03211914-186supp