6th 6-months Flashcards
In _______ _________, the reduced finished diameter always stays the same along the total length of the workpiece
Straight turning
A _______ notch is cut into the workpiece to ensure that the grinding tool can advance right up to the square face of the larger diameter
Relief
When tapering, the _______ _______ method is most often used for tapers larger than 3 inches per foot
Compound Rest method
Generally, shorter pieces of work are held in a ______, in a collet, or mounted on a _____ for facing.
Chuck
Mandrel
When facing between centers, use a _______ _______ to provide clearance for your cutting tool.
Half center
Always counterbore your workpiece in the ________ _______ _____ used for the primary boring operation. This ensures concentricity of the bored and counterbored holes.
Same lathe setup
To bore large and irregular shaped workpieces, use a _______ ______ mill.
Horizontal Boring Mill
Which taper method can be used for boring tapered holes?
Compound rest method
Using the ______ attachment on a large is the most accurate method for boring tapered holes
Taper
The shape of the threads to be cut is controlled by the ______ of the _______ tool.
Profile of the cutting tool
The most common way to set up a lathe for drilling is to mount the drill in the ________ quill.
Tailstock
When drilling a bulky or cumbersome workpiece, you should mount the drill in the lathe headstock if you need to _______ a _______ hole
Drill a long hole
Drilling with the drill head stationary is generally ________ _________ than the headstock method
More accurate
The _______ ________ _______ is the machine most commonly used for drilling holes where a great deal of accuracy is required
Sensitive drill press
If a job requires you to drill holes in a workpiece that is too large for an upright drill press, you should use a ________ drill press
Radial
The biggest difference between counterboring and spot facing is that in spot facing a _____ amount of metal is removed from the top of the drilled hole so that a fastener can seat firmly
Small
To bore in a drill press, you install a ______ _______ in a ______ head
Boring bar
Boring head
If necessary to repeat the same drilling operations on several workpieces, and the holes and pieces are all the same, use a _____ _____
Drill jig
Reaming may be done by _____ or on a ______ _____ or on a ______
Hand
Drill press
Lathe
During the honing process ________ ________ _______ contact the work surface and remove very small amounts of metal
Small abrasive stones
If you must machine a groove in the top surface of a workpiece, you use the ________ _______ operation
Side milling
In profile milling, the cutters are made to produce ______ and _______ profiles
Concave and convex
Face milling cutters that are less than 6inches in diameter are often called ______ end mills
Shell
For slotting on a milling machine, special milling cutters are available for machining _______ for all standard __________ keys
Key ways
Woodruff keys
What is the benifit of shaping vs. milling?
Shaping is less costly
The cutting tools are easier to make
The tools can reach into places that other tools can’t go
All of the above
Broaching ______ or _______ a long special designed cutter through a hole in the work
Pushes or pulls
The cutting teeth on a broach _______ in height from the end of the tool first entering the work to the end entering the work last
Increases
Surface grinding is done in order to?
Produce a fine finish
Produce extremely close tolerances
To remove metal machines can’t
All of the above
By using a vertical type surface grinder, you can grind a _________________________________.
Larger area in a given period of time
As the accuracy required to hold a tolerance increases….
The difficulty of operating a machine increases
The accuracy required to hold the close dimensions to size affect the choice of machine
The function of the workpiece changes
All of the above
Angular dimensions are measured in ______ and __________.
Degrees and minutes
In an angular tolerance, the spread gets _______ as the distance from the center ________.
Larger
Increases
Multiple dimensions which are related to eachother
_________ __________
Tolerance stack up
In the unilateral system, the tolerance is applied in only one direction from the nominal size.
Either a _______ or ________
Plus or minus
In a ______ cut, the extra material on the workpiece is removed to finish the part to the required dimensions and surface finish
Rough
The finish cut on a workpiece is the removal of _______ ________ amounts of material
Very small
The type of surface finish made by a machine tool is influenced primarily by?
Vibration between workpiece and tool
Feed marks left by the shape of the cutting tool
The way chips are formed by the tool
All of the above
An instrument that electronically measured average roughness height is called a?
Surface averaging instrument
The ease or difficulty with which you can remove metal from a piece of material
Machinability
Brittle metals like cast iron will form __________ chips
Discontinuous
There are many fluids used for machining, the main considerations in cutting fluids are:
Use of the correct type of fluid
Use of the proper amount of fluid
Correct point of lubrication
All of the above
Solid lubricants are mostly used to grease the sides and backs of _______ and _______ blades
Hacksaw
Bandsaw
To machine workpieces efficiently, figure out the best ______ ______ in which the operations can be performed.
Machining efficiency originates with a careful study and analysis of the total job
Operational sequence
You should try to keep the workpiece in the __________ machine for as many operations as possible
Same
What part of a lathe must be perfectly level at all times?
The bed
When selecting stock, you should choose a piece that is ________ _________ than needed.
Slightly longer
When mounting longer workpieces in the lathe, mount it ______ ________
Between centers
The faceplate should only be threaded onto the spindle by _____
Hand
Do not select a lathe dog that is _______ than necessary to accept the workpiece diameter
Larger
When using a dead center, use a half center for _______ _______
Tool clearance
Clearance for the entry of a facing tool at the work center is provided by using a _______-______
Half-center
Be sure the tail of the ______ ______ does not sit on the bottom of the faceplate slot
Lathe dog
Too much tool overhang can cause the tool to _____ ____ during machining
Snap off
When selecting speed and feed, you must learn to _____ the cutting speed with the feed
There are many tables provided that show cutting speeds and feeds.
The speeds can also be calculated
RPM=(SFPMx4)/work diameter
Balance
When moving the cutter into the workpiece, be careful not to _____________.
Strike the dead center
When you turn down the diameter of a workpiece you must remember that each cut is reducing the diameter of the work by _______ the depth of the cut
Twice
When cutting right handed turning setups, the cutter is fed into the work from ______ to _____
Right to left
When mounting the cutter and holder in the lathe, Once the tool holder and cutter are mounted to the tool post, turn the holder so that the tip of the tool is pointing ___ or ____ toward the tailstock
4° or 5°
To rough turn the workpiece, you will want the tool to cut at an angle __° ____ the workpiece center
5° above
When reversing your work in the lathe chuck, use a thin metal sleeve to _____________________
Protect the surface from the lathe dog set screw
The cutting tool for finishing cuts should be set at _° above the workpiece centerline
5°
Always take _______ cuts in the same direction as ________ cuts
Finishing
Rough
When working with a lathe, the _____ and the _____ must be perfectly level at all times
Bed and the ways
When selecting stock, always use material that is ________ _________ than needed
Slightly longer
When selecting the mounting method in a lathe, mount pieces of moderate to longer length stock ________ ________
Between centers
When installing the faceplate, thread the faceplate onto the spindle _________ ________
By hand
When selecting a lathe dog, do not select one that is _______ than necessary to accept the workpiece diameter
Larger
To provide clearance for the facing tool, use a _______ _________ at the dead center location
Half center
While facing the ends of the workpiece, the tail of the lathe dog should not ____________________________.
Contact the bottom of the faceplate slot
Clearance for the entry of of a facing toll at the work canter is provided by using a ________ ________
Half center
Too much tool overhang is dangerous because it can cause the tool to ______ _______ during machining
Snap off
You must learn how to ______ the cutting speed with the _______
There are many charts provided by various lathe manufacturers showing cutting speeds and feeds for machining different metals
Balance
Feed
Rpm=(sfpmx4)/work diameter
The term 4 is a constant
^^^
When mounting the cutter to the workpiece, be sure not to ______ the ______ _______ against the workpiece
Strike
Dead center
When turning a workpiece, you reduce the diameter by _______ the depth of the cut
Twice
In a right hand rough turn, the cutter moves from _______ to _______
Right to left
When installing a tool in a lathe, the tip of the tool should be pointing _____ Towards the tail stock
5°
Too rough turn of work peace, you will want the tool to cut at an angle ___° _____ the workpiece centerline
5° above
When reversing work in a lathe use a sleeve to protect the Surface from the ______ ______ set screw
Lathe dog
You should always take finishing cuts in the _______ _______ as the roughing cuts
Same
Direction
When taking a trial cut, you should take a cut about _____” the length of the Workpiece
1/4”
When laying off or marking shoulders on a workpiece, use a __________ caliper or a ________ scale to set the _________ caliper to the location of the outer shoulder. Place the bent leg of the caliper against the ________ end of the workpiece
Hermaphrodite caliper
Machinist
Hermaphrodite
If you are required to make several duplicates of a shouldered part, you might use a _________ tool to lay off the shoulders
Parting
the_____ _______ cutting tool is normally used for turning filleted shoulders
Round nosed
Fillets of different sizes are made by changing the _________ ________ Of the cutters
Nose profiles
Mini machine assemblies require that a bearing or other part Be mounted flush against a shoulder face. Therefore the face of the shoulder and the smaller diameter must be ______ with one another
Square
Knurling _______ the sorta e of the workpiece
Deforms
A knurling tool with a medium roller will be a pitch of _____
21
Filing on a workpiece between centers is mostly done the remove __________ or _______ _________ from the work surfaces
Irregularities
Tool marks
Never engage the split nut when any other _______ _____ mechanism is in operation
Automatic feed
The ______ ______ assembly is used only when cutting threads
Split nut
The ______ of the single thread screw is measured from one point on one thread to the same point on the next thread parallel to the screw axis.
Pitch
The _____ Other thread is the distance would you point on one thread travels during one revolution of the screw
Lead
If the work because you were machining was long and slender you need to use a ________ _____ or a _______ _____ For Support during the threading process
Steady rest or follower rest
American national thread angle is always _______°
60°
When threading the compound rest should be swung to the right at and angle of ___°
29°
The __________ __________On the lathe crossfeed mechanisms can perform the same function as a thread cutting stop
Micrometer collar
The top face of the thread dial indicator is marked off in eight divisions. _____ of them are numbered
Four
The Morse taper is approximately _____in/ft. It is used on the shanks of twist drills, readers, end mills, and lathe centers
5/8in/ft.
In a jarno taper, the large Diameters fractional value is always __, the small diameter denominator is always __, and the tapers length Denominator is always ___.
8
10
2
When turning tapers, the ___________ ___________ Method requires the work to be removed from the lathe for set up
Tailstock set-over
Remember this formula for tapers.
Taper per inch = (Large Diameter-small diameter) divided by length
^^^
The amount of inward and outward feed on the compound or us is controlled by the angle setting of the ______ ______ on the taper attatchment
Guide bar
Machining a plain taper requires you to always disconnect the ____ _____ screw when using the plain taper attachment
Cross feed
The best way taper short, steep tapers when using the compound rest is to _______ the coonhound rest and feed the ______ into the work with the compound rest feed screw
Swivel
Cutter
The compound rest method of turning tapers requires working with ______ since the base of the compound rest is graduated in degrees
Angles
When turning the tapers, make sure to back the compound rest all the way out in order to have _____ ______ available for turning the taper
Full travel
To obtain a very close tolerance, use a _____ test indicator, or a _____ bevel protractor
Dial
Vernier
The cutting tool used for finishing cuts should be set at __° above the centerline of the workpiece
5°
In belt drives, ______ is transmitted by _______. The power transmitted equals the force multiplied by the speed of the belt.
Force
Friction
In a v belt sheave, the pitch diameter is always _____ than the outside diameter of a sheave
Less
Conventional belts are designated by the letters A, B, D and E.
____ being the narrowest
____ being the widest
A
E
The belt with ______ strength because of a backing applied during manufacturing is called a group belt.
Uniform
In the spring loaded sheave, the fittings on the unit include ________
Lubrication
Chain drives have an advantage over belt drives because energy is not wasted and the chain drive is ______ ______ than a belt drive
More efficient
Engineering class chains have thicker sidebars, and the rollers are _____ together
Closer
Type B sprockets are ________ on one side, but have a slightly _________ hub on the _______ side.
Type C sprockets have hubs extending on ______ sides
Flat on one side, extended, other side
On both
Install the chain with a slight amount of sag on the slack side and with the _________ side in ________.
Driving side in tension
The depth to which a gear tooth extends into the open space between the teeth of a mating gear is called _________ __________
Working depth
DP= N
—-
D
30
——. = 2.0444
14.7
Remember that
The angled tooth face assured that several teeth are in contact at the same time between the pinion and driven gear, producing ______ and quiete operation
Smooth
Herringbone gears
First the tooth forms a point at the center of the gear. This point is cut by machine and is smooth. When the mating gear is brought into contact there is no interference between the teeth. The helix angle of the tooth is very near _____ °
30°
The distance between the screw threads is called __________ _________ _________
Worm axial pitch
Miter gear boxes are used for changing the ________ ____ _______ of motion, they provide ratios of 1:1
Changing the direction
The first most important step you must take when you are installing a gear drive is to make sure that it is _________
Aligned
The mechanical power rating of a gear drive depends on the _______ and _______ of the gear drive
Speed and torque
The service factor of a gear drive depends on the _______ _______
Duty cycle
________ _________ is commonly used in parallel shaft gear drives but has its limitation. The slow speed of some units does not cause enough splashing to provide enough lubrication. __________ systems are usually used for supplementary lubrication
Splash lubrication
Pressurized systems
The type of adjustable speed drive is selected by the ______ required. The _____ range, the _____ it must deliver and the conditions in the workplace
Speed
Speed
The power it must
In the belt type adjustable speed drive, as the flanges move in, the belt speed increases. As the flanges move out, the belt ______
Slows
The input sheave of an adjustable speed drive is movable and is connected to a _______ mechanism. Another type of drive uses a _____ mechanism
Some use _____ or _______ control mechanisms rather than mechanical ones
Shifting
Gear
Pneumatic
Electric
The belts used in enclosed adjustable speed drives are ribbed and resemble a ______ belt. The chain is of a modified ____ or lattice design.
Timing
Leaf
Roller type adjustable speed drives have a ______ shape, and move _____ and the speed ratio changes to provide the maximum output speed
Conical
Axially
In the reverse indicator method, one dial indicator is mounted on the coupling flange of the _______ and takes measurements on the pump. The other is mounted on the coupling flange of the pump and takes measurements on the _______
Motor
Motor
When aligning 3 machines, there may be too few shims under the motor to allow you to lower it far enough, or there may not be enough clearance in the bolt holes to allow you to move it sideways far enough.
Study this
The setup for a face rim alignment, on dial indicator is mounted on the ______ shaft and takes readings from the _____ shaft
Same
The setup for a long shaft alignment uses _____ indicators on _______ flanges and takes readings from the opposite sides of the ______ shaft
Two
Opposite
Same
Laser alignment makes aligning ______, _______, and more _______
Easier, faster, more accurate
The two classes of jaw couplings are ______ and ________.
Rigid
Flexible
In chain couplings, the _____ can be replaced without disturbing the moving components because it wraps around the outside of the hubs
Chain
