Chapter 8: Knowledge Check

Check Your Knowledge: Chapter 8

Quiz yourself using the following chapter review questions to check how well you can recall the material.

Review Questions

1. True or false: A drill press is a safe, non-threatening piece of equipment.
2. How can an operator find specifics about drill press maintenance?
   1. Asking a friend
   2. Reading the machine specific operator’s manual
   3. Searching Google
   4. Asking the supervisor
3. Use the correct term to complete the sentence. The __________  is located within the drill press head and holds the tooling by way of a Morse taper.
4. Use the correct term to complete the sentence. The __________ is a device that allows the operator to limit the downward movement of the quill.
5. This workholding method comes as a kit containing T-nuts, studs, regular nuts, risers, extensions, and the clamps themselves.
   1. Fixture clamps
   2. C-clamps
   3. Drill press vice
   4. Cantilever clamps
6. Use the correct term to complete the sentence. A __________ can be used to align the drill press with layout lines or a center punch mark when clamping work to the table.
7. This is a complex device that uses multiple jaws to grip the straight shanks of drilling cutting tools.
   1. Drill press vice
   2. Morse taper
   3. Drill Chuck
   4. Jacops taper
8. Use the correct term to complete the sentence. The __________ has a single job. It creates holes, and it is the most efficient tool for this job.
9. Use the correct term to complete the sentence. A __________ is used to remove a taper shank tool from the spindle of a drill press.
10. This is a simplified formula to calculate the RPM of drilling tools.
    1. RPM = (SFPM × 3.82) / Radius
    2. RPM = (PI × 3.82) / Diameter
    3. RPM = (SFPM × 3.82) / Diameter
    4. RPM = (SFPM × 12) / (Diameter × Pi)
11. What procedures must be done prior to drilling holes on a drill press?
12. What speed and feed adjustments must be made when reaming?
13. What is the correct TDS for a 5/16 -18 tap?
14. How should the depth be controlled while countersinking?
15. What feature of the counterbore tool is necessary to keep the counterbore aligned with the hole?

Answer Key

1. False – Nice work, although it looks simple and basic, a drill press needs to be respected like any other piece of equipment.
2. Reading the machine specific operator’s manual – Nice work! This is the best answer because the information comes straight from the manufacturer.
3. spindle – Great job! The spindle is located within the drill press head and holds the tooling by way of a Morse taper. The spindle rotates on bearings inside the quill and provides the rotational movement necessary to perform the machining operations. It is connected to the motor by a series of belts and pulleys.
4. quill stop/stop – Great job! The quill stop is a device that allows the operator to limit the downward movement of the quill. By limiting the quill’s movement, the operator can accurately adjust and set the depth of features. This is especially handy for machining the same feature in multiple locations. Quill stops come in a few different styles. One uses a simple threaded rod with nuts that can be positioned to limit movement. Another type uses a more complex mechanism that is incorporated into the quill handle.
5. Fixture clamps – Nice work! Fixture clamps generally come as a clamping kit. The kit will contain T-nuts, studs, regular nuts, risers, extensions, and the clamps themselves. When in use, the operator will select the components needed to clamp the part to the drill press table.
6. center finder/wiggler – Great job! A center finder/wiggler can be used to align the drill press with layout lines or a center punch mark when clamping work to the table.
7. Drill Chuck – Nice work! The drill chuck is a complex device that uses multiple jaws to grip the straight shanks of drilling cutting tools.
8. twist drill/drill/drill bit – Great job! The *twist drill* is often the primary tool used on a drill press.
9. drill drift/drift – Great job! A drill drift is used to remove taper shank tooling from drill press spindles.
10. RPM = (SFPM × 3.82) / Diameter – Correct! This is a simplified formula that makes it easier to calculate RPMs for drilling tools.
11. Layout and spotting the hole positions. Without proper layout, a hole’s position will not be accurate. After layout, spotting the hole with a center drill or spot drill is necessary to help start the hole in the precise location indicated by the layout.
12. The reamer should be turned at half the speed and advanced into the work at twice the feed, of an equally sized twist drill. The reamer has more cutting edges and takes considerably less material away from the part than a twist drill. These facts make the reamer prone to chatter. Reducing the speed and increasing the feed rate will allow the tool to properly cut into the material, eliminating the conditions that create chatter.
13. The correct TDS for a 5/16 -18 tap is .257, an “F” drill.
    The formula is to calculate TDS is:
    TDS = Nominal Dia. – 1/N
    In this formula the nominal diameter refers to the size of the bolt. “N” is the number of threads per inch. For example, if a TDS for a 5/16-18 bolt is required, the equation would look like this.
    TDS = 5/16 – 1/18
    TDS = .312 – .055
    TDS = .257
    .257 = Letter Drill “F”
14. The quill stop is the proper way to control the depth of a countersink.
    Counter sink features often have a small tolerance for depth. Without a positive stop, it is very difficult to get an accurate depth and consistency between holes.
15. The pilot is used to keep the counterbore aligned with the hole.
    Without the pilot properly inserted into the hole, the flat bottomed counterbore would not be able to stay in alignment, walking its way around the top of the part.