Hand Tapping Machine

(Originally from here)

The Shop in Bray Lab has a hand tapping machine that can be used to create threaded holes in metals like steel, brass, aluminum, or cast iron depending on the bit used.

Setup

• Internal threading is done by using a tool called a TAP
• Tapping is done on a hole that is pre-drilled for a specific thread size and pitch to be
  cut
• External threads (for bolts) are made using a DIE, which is applied to a specified
  diameter of rod for the specified size and pitch to be cut
• Select proper hand tap (taper, plug, bottoming) and fit it into a holder
• Align pre-drilled workpiece under tap (can use mini-vise to hold part)

Safe Operation

• Turn handle clockwise to start thread (back up every 1-2 turns to break forming chip)
• Use lubricant to assist the thread-cutting
• Taps can be brittle, so be careful not to bind the tap or break it

Cleanup

• If a tap or threaded piece needs cleaning with compressed air, protect your eyes with
  proper protection (do NOT endanger person in the area near you
• Use a brush or piece of cloth to remove chips, NOT your hand
• Clean table, floor, and surrounding work area