miércoles, 8 de junio de 2016

physical properties

physical properties:_A set of pulleys assembled so that they rotate independently on the same axle form a block. Two blocks with a rope attached to one of the blocks and threaded through the two sets of pulleys form a block and tackle.[6][7]
block and tackle is assembled so one block is attached to fixed mounting point and the other is attached to the moving load. The ideal mechanical advantage of the block and tackle is equal to the number of parts of the rope that support the moving block.
In the diagram on the right the ideal mechanical advantage of each of the block and tackle assemblies[5] shown is as follows:
  • Gun Tackle: 2
  • Luff Tackle: 3
  • Double Tackle: 4
  • Gyn Tackle: 5
  • Threefold purchase: 6
Chemical properties:
Timing pulleys mate with same-pitch timing belts in synchronous drives. Some timing pulleys are designed with an inch-based pitch designation. Timing pulleys are used in power transmission systems where maintenance of speed ratio is an important design consideration. These synchronous belt drive systems are durable, highly efficient, and suitable for many different applications.

English pitch timing pulleys have a spacing or pitch based on inch (in.) measurements and a toothed, trapezoidal form.
  • 0.080 in. (MXL)
  • 0.0816 in. (40 DP)
  • 0.200 in. (XL)
  • 0.375 in. (L)
  • 0.500 in. (H)
  • 0.875 in. (XH)
  • 0.250 in. (XXH)
English pitch timing pulleys with an MXL, 40-DP, XL, or L pitch designation are designed for light duty applications. By contrast, pulleys with an H, XH, or XXH pitch designation are designed for heavy duty use.

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