NikitaMaree
Nikita Maree
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How to make a Thread Tap

How to make a quick and easy tap for cutting a thread.
This tool is more of a last resort when you need to tap a thread
and you do not have immediate access to the actual necessary tool.
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We take an existing bolt of the exact thread Diameter and pitch required.
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I recommend a high tensile steel bolt. But mild steel may work as well.
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The idea is to make cuts along the bolt threads so that it somewhat
resembles an actual thread tap.
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Secure the bolt in a vice
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Carefully cut the slots with a thin cutting disk.
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Your angle grinder cuts should look something like this.
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Make yourself a quenching bath, I am using a mixture of salt water.
But I have used old engine oil in the past.


Fire up your burner.

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Heat the bolt to approximately 800 degrees Celsius,
or 1450 to 1500 degrees Fahrenheit.
Which is expressed as a bright cherry red colour in carbon steel.
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Then quench till it is a safe temperature to touch.
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The bolt is now hard and somewhat brittle.
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Now to test it.
Drill the required size hole in the piece that needs tapping and add some oil.
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Start tapping the thread.
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There you have it.
This quick tool was able to cut a pretty decent thread in 10mm 3/8 inch mild steel.
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This would be a good enough substitute in some situations.
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We have more useful videos over on YouTube
and we would love to see you there ♥
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