Flashcards
Section 10 Drilling Machines Unit 38 39 40 page 300
Cards in this deck (46)
- 1Define drillingthe operation of producing a hole using a tool called a twist drill
- 2Define boringthe operation of truing and enlarging a hole by means of a single point cutting tool, usually held in a boring bar
- 3Define reamingthe 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
- 4What 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. - 5State 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 - 6Compare 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 - 7Describe and state the purpose of the following parts of a sensitive drill press: baseprovides stability for the machine, and rigid mounting for the column
- 8Describe 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 - 9Describe and state the purpose of the following parts of a sensitive drill press: Drilling headcontains the mechanisms used to revolve the cutting tool and advance it to the workpiece
- 10Describe and state the purpose of the following parts of a sensitive drill press: Tableused to support the workpiece
- 11Describe and state the purpose of the following parts of a sensitive drill press: Depth stopcan be set to control the depth that the cutting tool enters the workpiece
- 12What 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 - 13Compare the construction of a radial drilling machine to that of a standard upright drill press,larger and heavier
- 14Unit 39: What is the purpose of a drill chuck?to hold the straight shank cutting tool
- 15Unit 39: How may chucks be secured to the spindle in: small drill presses?1
- 16Unit 39: How may chucks be secured to the spindle in large drill presses?1
- 17Name three types of drill chucks.key type
keyless type
precision keyless
jacobs impact keyless - 18What is the purpose of a drill sleeve?used to adapt the cutting tool shank to the machine spindle
- 19What 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
- 20How is a tapered-shank drill removed from a drill press spindle?with a drill drift
- 21Name 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 - 22What is the purpose of V-blocks?to support round parts for drilling
- 23What is the purpose of step blocks?used to provide support for the outer end of the strap clamps
- 24Describe an angle plate and state its purpose.90 degree plate used to fasten work for drilling
- 25What is the advantage of a drill jig?eliminate the need for laying out hole locations
- 26Why is it important that work be clamped properly for any machining operation?so the part does not come loose
- 27Explain the procedure for clamping a workpiece properlyclamps, bolts and step blocks properly located and work clamped firmly. Clamping pressure is applied to the work piece, not the step block
- 28List 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 - 29Name three materials used to manufacture drills and state the advantages of any two.Placeholder
- 30Define the body, web, and point of a twist drill.Placeholder
- 31State the purpose of the following parts: TangPlaceholder
- 32State the purpose of the following parts: FlutesPlaceholder
- 33State the purpose of the following parts: MarginPlaceholder
- 34State the purpose of the following parts: Body clearancePlaceholder
- 35Why are various drill points and clearances used for drilling operations?Placeholder
- 36Describe and state the purpose of the following drill points: conventionalPlaceholder
- 37Describe and state the purpose of the following drill points: long anglePlaceholder
- 38Describe and state the purpose of the following drill points: flat anglePlaceholder
- 39Why is it necessary to thin the web of a drill?Placeholder
- 40List four systems of drill sizes and give the range of each.Placeholder
- 41State the purpose of the: -high helix drillPlaceholder
- 42State the purpose of the: -core drillPlaceholder
- 43State the purpose of the: -oil hole drillPlaceholder
- 44State the purpose of the: -straight fluted drillPlaceholder
- 45State the purpose of the: -gun drillPlaceholder
- 46State the purpose of the: -hard steel drillPlaceholder