1. Drill, Tap, Die & Eye

2. Fastening Metal
Drilling
Tap
Die
Eye

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

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

5. 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

6. 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

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

8. 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"

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

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

11. Threading Tools
Tap
Tap handle
Die
Die Stock

12. Threading tools cont.
Cutting Fluid

13. 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”_________.

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

21. Finish Closing the Eye in the Vice

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

24. 5. Mark 2” down from the straight end.

25. 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)

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

27. 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

28. 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.