Drill, Tap, Die & Eye

Fastening Metal Drilling Tap Die Eye

Drilling Drilling Procedure Layout the center of the hole to be drilled Mark the center with two intersecting lines Center punch the intersecting lines

Drilling Select the correct drill size from a drill index Put the drill into the drill chuck and tighten with the chuck key.

Drilling Clamp material to the table Place a drop of cutting fluid on the center punch mark Turn on drill and begin to drill hole Be sure to put even pressure on the drill

Tap and Die There are 2 ways to cut threads: External Threads (bolt) Die-cutting threads on the outside of a piece of rod Internal Threads (nut) Tap-cutting threads on the inside of a hole

Tapping Procedure Layout hole location using “Drilling” procedure Select required tap size and threads per inch (TPI) Consult Tap Drill chart for hole size

NATIONAL COARSE THREAD(NC) National Fine Threads (NF) Tap Drill Chart NATIONAL COARSE THREAD(NC)   National Fine Threads (NF) Size of Bolt Size of Threads or Screw and Drill Per Bolt or Screw Tap to Use Inch and Tap To Use 1/4" 13/64" 20 7/32" 28 5/16" 18 17/64" 24 3/8" 16 21/64" 7/16" 23/64" 14 25/64" 1/2" 27/64" 13 29/64" 9/16" 31/64" 12 33/64" 5/8" 17/32" 11 37/64" 3/4" 21/32" 10 11/16" 7/8" 49/64" 9 13/16" 1" 8 15/16"

Threads inside and out 3 classifications of threads National Fine (UNF) National Course (UNC) National Pipe Thread (NPT)

Thread Pitch- # of threads per inch Thread Diameter Diameter of the thread measured directly over the threads Thread Pitch- # of threads per inch

Threading Tools Tap Tap handle Die Die Stock

Threading tools cont. Cutting Fluid

Bending and Eye Eye bolts 1. Cut one piece of 1/2” round stock 9” long. You will be using a 7/8” die to make your loop. Note: 7/8” X 3.14 = approximately __3”_________.

2. Using the 7/8” die bend a closed loop Flip the loop and straighten eye bolt. (be sure to adjust pins when needed)

Finish Closing the Eye in the Vice

4. Taper the straight ends of the eye bolt on the bench grinder.

5. Mark 2” down from the straight end.

6. Using the ½” die and die stock holder cut threads in you eye bolt until they reach the 2” mark. (Be sure to use plenty of oil)

7. Clean oil off of eye bolt using a paper towel and clean threads on wire wheel.

Making the Nut Cut a piece of 1” X 1” ( ¼” long) Locate the center and mark with soap stone Center punch the center mark Secure square stock in vice on drill press Put a 27/64” bit in drill chuck Drill hole using plenty of oil

Taping the Nut Secure nut in vice Using ½” tap NC 13 slowing turn clockwise while applying pressure. Be sure to use plenty of oil.