Threading Activity¶
In this activity you will practice drilling and tapping, and well as threading with a die. Cutting threads is a technique used over and over again to provide a way to secure parts together in a firm, but removable way. Be sure to follow proper safety and personal protective equipment procedures!
Materials¶
- 6061 Aluminum plate (2”x2”x0.5” cut from McMaster 8975K74)
- 6061 Aluminum rod (0.25”x2.5” cut from McMaster 8974K22)
- 1/4”-20 Through-Hole Tap (McMaster 26955A43)
- 1/4”-20 Right Handed Die (McMaster 2576A451)
- #7 Twist Drill (McMaster 29045A727)
- #4 Centerdrill (McMaster 2915A14)
- Tap driver (McMaster 2546A23)
- Die handle (McMaster 25565A21)
- Deburring tool (McMaster 4289A35)
- Cutting lubricant (Crisco, Tap Magic, etc.)
Procedure¶
- Layout and mark the center of the plate for drilling (with a rule or layout dye and calipers).
- Using the center drill, make a pilot mark for the final drill. Do not drill through the material!
- Drill the hole to its final diameter (#7). Drilling a smaller pilot hole first is recommended.
- Deburr both sides of the hole.
- Lubricate the hole and tap, then tap the hole being careful to get a straight start.
- Mark the thread depth on the rod so that it will fully screw into the newly tapped hole, but not stick out of the back side of the plate.
- Using the die and lubricant, thread the rod.
- Assemble the parts, write your name, and turn it in!
Helpful Video¶
The video below shows roughly the process you will follow. If you have layout dye available, it is especially helpful.
Grading Rubric¶
| Description | Max Points |
|---|---|
| Turned in on time | 5 |
| Parts screw together | 30 |
| Centering of hole | 10 |
| Threads on dowel | 10 |
| Threads in plate | 10 |
| Total | 65 |