Tapping involves drilling with a specialized drill bit which creates internal threads or grooves within the hole. This can be done either by hand or with a tapping machine such as a power drill. The new thread created within the hole allow you to screw a bolt within.
Like any other drilling-based process, tapping requires careful operation of the equipment and attention to detail. For example, tapping on a stable surface with a properly secured work piece is essential for avoiding significant personal injury.
Firstly, check the hole for any debris or metal shavings left behind by the tapping process, clear these out, If this issue persists, take a square ruler to check that the tap has made a straight entry into the material.
Whilst it is possible to tap without using lubricant or cutting fluid, it is generally advisable to do so. This is for the same reasons as other forms of drilling, namely to minimize the heat of the drill bit during a cut.
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