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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
stripped crankcase threads
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<blockquote data-quote="kettlrj" data-source="post: 117315" data-attributes="member: 1455"><p>'There is nothing new in threads' the man said. I am a fan of a thread form called 'Spiralock'. It is only applied to the internal thread and can be applied to any related male thread. It is all to do with the resultant force that is applied by the male thread to the female thread, which in the case of a 55deg. Whit form will be at an angle of 27.5 deg. to the thread axis. This force loads up the first thread by up to 70% of the clamp load with the subsequent threads taking less and less load until by about the forth or fifth threads no load is taken. So what happens in practice is that the first threads fails and passes the load on to the second thread, by which time the clamp force has been lost or at least reduced. Any vibration or loading at the joint face will then create even more load on the second thread and that will soon fail, and so it goes on until all the threads are stripped. The Spiralock thread has a double flank which catches the tip of the male thread and causes a resultant force at 60 deg. to the thread axis. This creates a far better distribution of forces from thread to thread and in doing so creates a self locking thread in the process.</p><p>Take a look at</p><p> <a href="https://www.stanleyengineeredfastening.com/brands/optia/spiralock" target="_blank">https://www.stanleyengineeredfastening.com/brands/optia/spiralock</a></p><p></p><p>Regards Richard.</p></blockquote><p></p>
[QUOTE="kettlrj, post: 117315, member: 1455"] 'There is nothing new in threads' the man said. I am a fan of a thread form called 'Spiralock'. It is only applied to the internal thread and can be applied to any related male thread. It is all to do with the resultant force that is applied by the male thread to the female thread, which in the case of a 55deg. Whit form will be at an angle of 27.5 deg. to the thread axis. This force loads up the first thread by up to 70% of the clamp load with the subsequent threads taking less and less load until by about the forth or fifth threads no load is taken. So what happens in practice is that the first threads fails and passes the load on to the second thread, by which time the clamp force has been lost or at least reduced. Any vibration or loading at the joint face will then create even more load on the second thread and that will soon fail, and so it goes on until all the threads are stripped. The Spiralock thread has a double flank which catches the tip of the male thread and causes a resultant force at 60 deg. to the thread axis. This creates a far better distribution of forces from thread to thread and in doing so creates a self locking thread in the process. Take a look at [URL]https://www.stanleyengineeredfastening.com/brands/optia/spiralock[/URL] Regards Richard. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
stripped crankcase threads
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