Machinability index definition

Collection Mechanism The trusty index card will work for performing inspections, but this requires the individual to remember the inspection criteria or refer to an inspection list and make notes about observations. A clipboard with a predefined set of questions (that can be answered yes or no ) for each machine is a definite improvement on the index card method. Be sure to leave a space for comments. Both the index card and the clipboard approach require manual entry of the data once they are collected. A more modern approach is to set up the inspection in an industrial-quality personal digital assistant. For each machine, the inspector can answer yes or no, and as required, write short comments. These comments could be selected from a drop-down menu to minimize inconsistency. The data can then be uploaded to a host computer for storage. This speeds the process, ensures that the data will be captured, and reduces transposition errors. 

The so-caUed Sigma concept has been widely used in the field of centrifugal sedimentation ever since its first development by Ambler in 1952. It is a simplified relation between the machine performance in terms of X50, total volumetric flow rate Q and an index of the centrifuge size E. The cut size X50 is represented by its terminal settling velocity Vg in the given liquid under gravity so that from Stokes law (using equation 7.5b for the definition of K)... 

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