26 Sep 2009 @ 4:57 PM 
 

Thread Mills For Percision

 

Threading tools have a valuable function in an array of machining, manufacturing and other functions. Superior threading tools are crafted from select micro-grain carbide and are CNC ground for quality and accuracy.

The elite thread mills are created from carbide using a tin exterior to support them for a maximum tool life and cutting speeds. Thread mills are useful because they are able to help you to thread different hole diameters using only one tool. Employing the helical fule design allows fluent, neat cuts and extended tool life. A good supplier will supply programming and technical support and present special designs to suit your application. Advanced thread mills make threads with the attention to detail, measurement and high finish to persistently accomplish tight fits.

To make internal threads, it?s necessary to drill the minor thread diameter to the precise measurement. Then, set the thread mill to the necessary depth. Subsequently, mill either the ‘X’ or ‘Y’ axis to the needed thread pitch diameter. Because of the little sizes and considering the difficult to cut material, it may be necessary to remove the material in several passes. It is always best to “arc-in” and “arc-out” when thread milling. Any “arc-in” and “arc-out” movements need to posses a matching ‘Z’-axis action in the middle of the ‘X-Y’ circular moves. For instance, if the “arc-in” surpasses 90 degrees, the ‘Z’-axis passage must be 1/4 of the thread pitch. (90 degrees is 1/4 of a circle). A right-hand thread is generated by going around in a counterclockwise direction while shifting the ‘Z’-axis up one pitch for every 360 degrees.

A left-hand thread is made by encircling in a clockwise movement along with shifting the ‘Z’ axis up one pitch per 360 degrees. The complete series of actions can be reached by appending in a declining course and overturning the revolution course.

External threads require the major diameter milled to size before the thread mill is implemented. Right-hand threads are made by moving up and in a counterclockwise direction. Identical threads are able to be cut by moving down and switching the orbit route.

NPT threads are most often created at the same time moving the tool in a downward direction. Because these tools are crest cutting, it is not absolutely required to ream the internal minor diameter or mill the external diameter to size. Keep in mind, it is extremely recommended to do so as the tools will have a lesser amount material to remove. If the tool is to be used in an upward direction, spiral movement is required.

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Categories: construction
Posted By: freetraffic
Last Edit: 26 Sep 2009 @ 04 57 PM

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