What is the proper way to drill and tap?

Be sure to use tapping oil before tapping. Drill a hole to the correct size, and place the tap in the hole, ensuring the tap is sitting at a 90-degree angle. Slowly turn the tap a few threads and back out to remove any loose material. Then, slowly tap further.  Repeat this process until your hole is fully tapped to the proper ⅛-27 NPT thread pitch.

Please check out the installed video for drilling and tapping below:

How to Properly Tap https://www.youtube.com/watch?v=QUyNYxGYgGA

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