Which timken bearing conversion kit is the best?
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Ahh, now I see! I'm just a home garage mechanic that enjoys learning. Did a bit more research. For the people that want more detail, there are two types of taps, cutting and forming (roll).
Forming taps require a slightly larger hole, as the material being threaded flows into, as well as away from, the threads of the tap. The finished minor diameter of the hole will be smaller than the unthreaded hole when the process is complete. It should also be understood the Forming taps run better at speeds 1-1/2 to 2 times faster than a cut tap, and require much more attention to lubrication of the tool, as friction between the tap and the work piece can create problems with generated heat and torque forces imposed on the entire set-up.
It is universally accepted that formed threads are stronger than cut threads.
So, a #25 drill bit is used for a #8 screw that was formed with a 8-32 roll tap.
a #25 drill bit is used with a #10 screw that was cut with a 10-24 cut tap.
https://www.natool.com/cutting-taps-vs-forming-taps/
Forming taps require a slightly larger hole, as the material being threaded flows into, as well as away from, the threads of the tap. The finished minor diameter of the hole will be smaller than the unthreaded hole when the process is complete. It should also be understood the Forming taps run better at speeds 1-1/2 to 2 times faster than a cut tap, and require much more attention to lubrication of the tool, as friction between the tap and the work piece can create problems with generated heat and torque forces imposed on the entire set-up.
It is universally accepted that formed threads are stronger than cut threads.
So, a #25 drill bit is used for a #8 screw that was formed with a 8-32 roll tap.
a #25 drill bit is used with a #10 screw that was cut with a 10-24 cut tap.
https://www.natool.com/cutting-taps-vs-forming-taps/
Have used one since my NYS Toolmakers apprenticeship days, from back in the 1970's.
The screws are only insurance.
We press the insert in the cases with Loctite 620, and on the screws as well.
And once the comp nut is locked on the sprocket shaft, nothing is moving.
Scott
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pappashelby
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Dec 8, 2008 02:24 PM
