How to choose a threaded hole diameter

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Oddly enough, many do not suspect how to choose the diameter of the hole for the thread. After all, as they teach at the institute, the thread for the drill is selected according to special tables.
If you are faced with the task of cutting a thread, then the table in the kit will help with the diameter of the hole for the thread. After all, all you need is to match the three components of success - the thread drill table.
Someone will judge me and say that this issue is not relevant and any student of the Faculty of Mechanical Engineering can find the diameter of the hole for a metric thread. If you choose the right hole diameter for threading, you can avoid massive tool breakage. After all, the diameter of the hole for the GOST thread will help you choose in any case, but there are even more popular methods for selecting the hole diameter.
And so an interesting question is how to cut a thread with a tap in a pre-drilled hole. And when you have chosen a drill for threading, you drill a hole and wait for the tap to make a thread in it. The diameter of a tap drill can be determined very quickly by subtracting the pitch from the nominal diameter.
If the thread hole is made more accurately, the thread quality and tool life can be improved. In the video tutorial, we will look at the M10 threaded hole and how to choose the drill diameter for the successful completion of this process.
Video link: • Как выбрать диаметр от...
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