324 Flashcards
Always check the lathe bed to make sure it is
Level
You should always cut off bar stock for machining
Slightly longer than needed
Longer workpieces should be
Mounted between centers
When installing a faceplate,
Screw it on by hand
Always select a lathe dog
Not larger than necessary to accept the workpiece
When facing, use a half center to
Allow clearance for the cutting tool
Be sure the tail of the lathe dog
Does not sit on the bottom of the faceplate
Make sure the cutting tool
Does not hang out excessively from the tool holder
The cutting speed and feed on a lathe should always be
Calculated to obtain the best possible finish
In accordance with published tables from manufacturers
In balance
All of the above
When moving the cutter into the workpiece during facing,
Be careful not to strike dead center
Always remember that your depth of cut will
Reduce the overall diameter by twice the amount of cut
Always use a right-hand tool when
Cutting right to left
Depending on the hand of cut, the cutting tool point should be _____ degrees toward the headstock or tailstock.
4 to 5
In rough turning, the cutter point should positioned _____ the centerline
5° above
With a constant depth of cut,
An increase in speed requires a decrease in feed
The most accurate way to test if adjustments are needed is
A trial cut
When reversing work end for end between centers,
Protect the machined surface from the lathe dog
Always take your finishing cut
In the same direction as the rough cut
When aligning the cutting tool for a finishing cut,
set the cutting tool above the centerline of the work
A trial cut should be about
^1/4 in.
When a shoulder is to be turned close to the end of the workpiece, use a scale and
Hermaphrodite caliper to measure location
The bent leg of a hermaphrodite caliper is placed against the _____ of the workpiece
Faced end
In order to lay off shoulder lengths more accurately when making more than one identical, use a
Parting tool
Filleted shoulders are turned with a _____ cutting tool
Round nosed
Different size fillets are made by changing
The nose radius on the cutting
Square corners on a shoulder are needed when
Other machine parts will be mounted against them
Undercuts always ensure
Square corners
Knurling operations always
Deform the workpiece surface
A 21 pitch knurling tool will produce a(n) _____ grade knurl
Medium
On a finished work surface, filing is usually done to
Remove tool marks and other irregularities
The split nut assembly is used only when
Cutting threads
Never engage the split nut assembly
When another automatic feed mechanism is in operation
The distance from a point on one thread to the same point on the next thread parallel to the screw axis is the
Pitch
The distance which a point on one thread travels during one revolution of the screw is the
Lead
When threading long slender workpieces, they should always be
Supported with a follower or steady rest
American National thread angles are always
60°
When cutting American National threads, the compound rest should always be set at an angle of
29°
The part of a lathe which can perform the same functions as a thread stop is the
Micrometer collar
How many divisions are marked on a thread dial indicator?
8
In cutting a right hand thread, the cutting tool is always fed
From right to left
A ^5/_8 in./ft. taper often used for twist drills, reamers, end mills, and lathe centers is the
Morse taper
A taper whose calculation depends on its assigned number in the form of a numerator over a constant denominator of 8, 10, or 2 is a(n)
Jamo Taper
The basic formula for calculating a taper is
Large diameter - small diameter / Length
The taper turning method which requires work to be removed from the lathe for the setup is the _____ method
Tailstock setover
The amount of inward and outward feed on the lathe’s compound rest when using the taper attachment is controlled by the
Guide bar
A plain taper attachment requires you to
Disconnect the crossfeed screw
The key to using the compound rest method for turning a taper is the fact that the compound rest
Swivels
When using the compound rest method for turning tapers, you will need to work with angular dimensions because
The base of the rest is graduated in degrees
When making cutting adjustments using the compound rest method, you must back the compound rest all the way out in order to
Have full travel
Along with using a series of trial cuts, the most accurate way to obtain angular settings for taper turning is the
Dial test indicator and vernier bevel protractor method
