Section 10 Drilling Machines Unit 38 39 40 page 300

Frage	Antworten
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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Section 10 Drilling Machines Unit 38 39 40 page 300

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