3240085
Description
Flashcards by Vincent Bergeron, updated more than 1 year ago
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Created by Vincent Bergeron
over 8 years ago
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| Question | Answer |
| Define drilling | the operation of producing a hole using a tool called a twist drill |
| Define boring | the operation of truing and enlarging a hole by means of a single point cutting tool, usually held in a boring bar |
| Define reaming | the operation of sizing and producing a smooth round hole from a previously drilled or bored hole with the use of a cutting tool having several cutting edges |
| What is the difference between spot-facing and counterboring? | spot facing - smoothing and squaring the surface around a hole to provide a a seat for the head of a cap screw or nut. counterboring - enlarging the top of a previously drilled hole to a given depth to provide a square shoulder for a bot or capscrew. |
| State two methods by which the size of a drill press may be determined. | - the distance from the center of the spindle to the column of the machine - the diameter of the largest circular piece that can be drilled in the center |
| Compare a sensitive drill press with an upright drilling machine. | sensitive drill press - only one hand feed machanism so the operator can "feel" how the drill is cutting. Generally light, high speed machines. upright drilling machine - larger and heavier. gearbox to provide greater variety of speeds. - 3 methods to advance splindle, hand lever, handwheel and automatically. - table may be raised or lowered - coolant reservoir on some models |
| Describe and state the purpose of the following parts of a sensitive drill press: base | provides stability for the machine, and rigid mounting for the column |
| Describe and state the purpose of the following parts of a sensitive drill press: column | - table is mounted to column and can be adjusted to any point between the base and the head - drill press head is mounted to top of column |
| Describe and state the purpose of the following parts of a sensitive drill press: Drilling head | contains the mechanisms used to revolve the cutting tool and advance it to the workpiece |
| Describe and state the purpose of the following parts of a sensitive drill press: Table | used to support the workpiece |
| Describe and state the purpose of the following parts of a sensitive drill press: Depth stop | can be set to control the depth that the cutting tool enters the workpiece |
| What are the advantages of a radial drilling machine? | - larger and heavier work can be machined - drilling head can be easily raised or lowered - drilling head can be easily moved to any location - more power - head can be swiveled on universal models |
| Compare the construction of a radial drilling machine to that of a standard upright drill press, | larger and heavier |
| Unit 39: What is the purpose of a drill chuck? | to hold the straight shank cutting tool |
| Unit 39: How may chucks be secured to the spindle in: small drill presses? | 1 |
| Unit 39: How may chucks be secured to the spindle in large drill presses? | 1 |
| Name three types of drill chucks. | key type keyless type precision keyless jacobs impact keyless |
| What is the purpose of a drill sleeve? | used to adapt the cutting tool shank to the machine spindle |
| What is the purpose of a drill socket? | used to adapt the drill when the hole in the machine spindle is too small for the taper shank of the drill |
| How is a tapered-shank drill removed from a drill press spindle? | with a drill drift |
| Name three types of drill vises and state the purpose of each. | drill vise - used to hold round, rectangular, square or odd shaped pieces for any drilling operation angle vise - allows drilling holes at an angle contour vise - special movable jaws that automatically adjust to odd shaped work pieces |
| What is the purpose of V-blocks? | to support round parts for drilling |
| What is the purpose of step blocks? | used to provide support for the outer end of the strap clamps |
| Describe an angle plate and state its purpose. | 90 degree plate used to fasten work for drilling |
| What is the advantage of a drill jig? | eliminate the need for laying out hole locations |
| Why is it important that work be clamped properly for any machining operation? | so the part does not come loose |
| Explain the procedure for clamping a workpiece properly | clamps, bolts and step blocks properly located and work clamped firmly. Clamping pressure is applied to the work piece, not the step block |
| List four important clamping hints. | always place bolt as close as possible to the work piece step block should be slightly higher than the work piece insert piece of paper between machine table and work piece shim parts that do not lie flat on the machine table |
| Name three materials used to manufacture drills and state the advantages of any two. | Placeholder |
| Define the body, web, and point of a twist drill. | Placeholder |
| State the purpose of the following parts: Tang | Placeholder |
| State the purpose of the following parts: Flutes | Placeholder |
| State the purpose of the following parts: Margin | Placeholder |
| State the purpose of the following parts: Body clearance | Placeholder |
| Why are various drill points and clearances used for drilling operations? | Placeholder |
| Describe and state the purpose of the following drill points: conventional | Placeholder |
| Describe and state the purpose of the following drill points: long angle | Placeholder |
| Describe and state the purpose of the following drill points: flat angle | Placeholder |
| Why is it necessary to thin the web of a drill? | Placeholder |
| List four systems of drill sizes and give the range of each. | Placeholder |
| State the purpose of the: -high helix drill | Placeholder |
| State the purpose of the: -core drill | Placeholder |
| State the purpose of the: -oil hole drill | Placeholder |
| State the purpose of the: -straight fluted drill | Placeholder |
| State the purpose of the: -gun drill | Placeholder |
| State the purpose of the: -hard steel drill | Placeholder |
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