How to drill andtap a holein metal

Insert the tap into a T-handle and add drilling oil to the hole. Fit the end of the tap into the hole pointing straight down and aligned with the hole. Rotate the T-handle clockwise using smooth rotations. Don't apply much pressure; allow the tap to thread the hole on its own.

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Tappingholesize

Turning speeds are adjusted to the feed rate of the mini lathe (0.004/rev.), a depth of cut of 0.040, and a tool life of 180 minutes.

Determine the spindle speed for turning, milling, drilling, and reaming with these charts and cutting speed calculators.

Tappedholevs threadedhole

You can use a tap to cut threads in a hole drilled in metal, such as steel or aluminum, so you can screw in a bolt or screw. The process of tapping a hole is actually pretty simple and straightforward, but it’s important that you do it right so your threads and hole are even and consistent. Choose a drill bit and a tap that fits the screw or bolt you want to use by making sure they’re the same size. For safety, it’s also important that you steady the item you’re drilling and you use the right drill bits.