Parallel bars software#
After all, software written for one sort of machine is not expected to work on the other.īut the distinction between the two is slowly breaking down. At present, mainstream programs written for PCs (such as word-processor software), and specialist programs written for supercomputers with thousands of processors (such as climate-modelling or protein-folding software), are written using entirely different tools, languages and techniques. Instead, making software run faster in the future will mean using parallel-programming techniques. “We're not going to have faster processors,” says Katherine Yelick, a computer scientist at the Lawrence Berkeley National Laboratory in California. But your spellchecker will not run six times faster on a six-core machine unless it has been specially written to share out the work between the available cores, so that they can tackle the job in parallel. And the computer's operating system may be able to assign different tasks to different cores, to ensure that, for example, video playback in a web browser does not slow down while a hard disk is scanned for viruses. A few pieces of specialist software can take advantage of multiple cores: image-processing software, for example, may divide up a difficult task and farm it out to multiple cores to get it done faster, combining the results when each core has finished its work. That is because nearly all software is still designed to run on a single-core chip in other words, it is designed to do only one thing at a time. Other uses include giving a raised surface when using t-slot clamps and for comparison with a surface or machined face to check the flatness.You might expect a six-core machine to be six times faster than a machine with a single-core microprocessor.
![parallel bars parallel bars](https://www.miracle-recreation.com/content/uploads/pim/159004/MREC_Youth_Fitness_159-004_male.jpg)
Parallels can also be used if the vise itself has a damaged face, which could cause the workpiece to be held insecurely. Parallels of different sizes can be used to support a workpiece that doesn't have a 'flat' surface underneath, or to give clearance when drilling in a vise to stop the drill damaging the vise. If a workpiece is too small to be machined in a vise without it being in contact with all three faces of the vice - parallels can be used either side to give clearance from the vise, and to give support from underneath to eliminate the workpiece being pushed down by the force of the cutting tool. The most common use is to support work when it is in a vise or clamped to the machine bed. Parallels are used in machining operations, be it milling, drilling, turning or sometimes grinding.
![parallel bars parallel bars](https://www.especialneeds.com/media/catalog/product/cache/1/image/7baf546b81bd6e694f260c7b7a7dc732/0/5/0540-90-94a.jpg)
Parallels are manufactured to either imperial or metric dimensions, and are often sold in a set, with several pairs of different sizes. They may also be lapped to achieve a mirror smooth surface. Then, the individual finishes are applied, from drilling to machining a chamfer along the edges to remove any burrs or sharpened edges. They are then paired and placed in a grinding machine, and each face is ground until the overall dimensions are correct - they are paired during this stage so that even if the dimensions are not correct, they are still parallel to each other. Parallels that only have 2 or 4 precision faces will often have the tool-marks from the machining on the non-ground sides.
![parallel bars parallel bars](https://i5.walmartimages.com/asr/288aafb1-06b7-43b5-ae19-df7c5c00040e_1.f03da527b3b5ab7f5ca176409cc0c101.jpeg)
Parallels are first machined to rough dimensions, leaving a few millimeters to allow the rest to be ground. Grade B - Lower surface tolerances, and are used for lower-precision machining.Grade A - Used for close-tolerance work, such as inspection or precision machining.
![parallel bars parallel bars](http://www.actionplayandleisure.co.uk/wp-content/uploads/2012/02/parallel-bars.png)
There are two main grades of surface tolerance: Parallels that have a good surface tolerance can be lightly bonded together by sliding or rotating two parallels together, and the smooth surfaces allows a temporary molecular-attraction to take place - this is known as Wringing and is also found with gauge blocks. The surface of a parallel can often tell how it was manufactured, with a 'grain' showing that it was ground - and a smooth or mirrored finish showing it has been lapped. Generally, workshop parallels have 4 faces that are machined and ground - the front, back and sides, although some do have the ends with a smooth surface.
Parallel bars series#
Parallels commonly have a series of holes drilled on the 'front' face - allowing them to be used to position a workpiece or secured using t-slot clamps, and a countersink on each side to remove any sharp edges. They come in a variety of thicknesses and size, allowing them to be stacked up or to support a workpiece which doesn't have a flat profile. Parallels come in pairs of two, which are machined to be the same dimensions their corresponding faces.