chapter 14 the lathe
spindle
Various work-holding attachments can be fitted to the ______
RPM= CS*4/D
cutting speed formula for inches
sequence
when lubricating a lathe you should use the type and grade of lubrication and the specific lubricating ________ specified by the manufacturer
the diameters of the part will be eccentric
how will the work be affected if the headstock center does not run true when working between center?
bent-tail safety
The ________ lathe dog has a recessed setscrew
jacobs
a _____ chuck is normally fitted in the tailstock but can also be used to hold small-diameter work for turing if fitted into the headstock
threaded spindle nose
a ______ is seldom used on modern lathes
3-jaw universal
a _______ chuck automatically centers work. all of the jaws move simultaneously
round-nose
a ________ tool is ground flat on the face and designed for lighter turning
combination drill
a _________ and countersink are usually used to drill center holes
90 degrees to the work surface
at what angle is the cutoff blade set when parting on a lathe?
at 30 degrees from a right angle
at what angle should you set the compound rest when rough turning between centers?
drill center holes
before work can be mounted between centers a ________ must be crilled at each end of stock
RPM=CS*1000/D*3
cutting speed formula for millimeters
carbide cutting tools
cutting speeds can be increases by 300 % or 400% by using this
in either direction
facing cuts can be made _______
3-jaw universal, 4- jaw independent, jacob, collet
four types of lathe chucks
square, angular, fillited, undercut
four types of shoulders
driving the lathe, holding and rotating the work, holding, moving and guiding the cutting tool
into what three functional categories do the various parts of the lathe fall?
swing
lathe size is determined by _______ and the length of the bed
HSS
many lathe operations will us a single point cutting tool made of what?
collet, 3-jaw universal, 4-jaw independent, jacobs chuck
most work can be machined while supported by one of four methods
parting
never attempt to perform a _______ operation on work being turned between centers
maintain precise alignment of the headstock and tailstock and guide the travel of the carriage
purpose of ways on the lathe bed
back gear
some lathes come equipped with _______ , allowing for slower speeds with greater power
1/3
spindle speed is about __________ that of convection turning
ways
the V-shaped bearing surface of a lathe that aligns and guides the movable part of the machine is the ______
half-nuts
the _____ is engaged only for thread cutting
clamp-type
the _____ lathe dog is used for turning square or rectangular work
lead screw
the ______ transmits power to the carriage through a gearing and clutch arrangement.
bent-tail standard
the _______ lathe dog has an exposed setscrew
3-jaw universal
the jaws of a _______ chuck cannot be reversed to hold large diameter work
4-jaw independent
the jaws on a _________ chuck can hold irregularly shaped work because each jaw has individual movement
to the left
the shank of the left-hand toolholder points _______
maintain accuracy over long period of hard usage and the ability to center work automatically
what are the chief advantages of a collar chuck?
is equal to the length of the bed minus the distance taken up by the headstock and tailstock
what determines the largest piece that can be turned between centers on a lathe?
the chip/ feed rate is excessive, it shows to much heat at the point of contact with the work and cutting tool
what do blue chips mean?
the feed rate is too fast for the depth of the cut
what do thick and intertwined chips tell you?
if the cutting tool is slightly above the center
what does a rounded nubbin indicate?
index plate
the _______ provides instructions on how to set the lathe shift levers for various thread cutting and feed combination
back gear
the ________ on a lathe system provides slower speeds with greater power
roughing cuts
the deep cuts made to remove a large amount of material from a workpiece are called ________
receive tools and attachments with taper shanks
the spindle on a lathe is hollow and is tapered internally to ________
is used to mount the lathe center
the tailstock _____
reduce chip width and to prevent binding in the grooves
why is the concave rake ground on top of the cutter when used for parting operations?
tailstock center
you should check work frequently when matching between center because as the workpiece heats up it may damage the ________
chipbreakers
________ are used to break the long , continuous chips that are created when machining some metals
machine oil
to prevent rust from forming, a light coating of _____ should be applied to all, machined surfaces
the cutting tool is below center
what does a square-shoulder nubbin indicate?
the distance the work moves past the cutting tool (fpm or mpm)
what is cutting speed
the lathe operates with the rotating of the work against the edge of a cutting tool
what is the basic principle of lathe operation?
dial indicator
what is the most accurate method for centering round stock in a 4-jaw chuck?
remove chuck key
what is the most important safety precaution to remember when using a chuck
work should be center drilled and supported with the tailstock center
what should be done to prevent springing when machining long work?
change the chip load and feed rate so that less heat is generated
what should you do if you see blue chips?
the irregular edge produced by grinding will crumble when used
what will occur is tools designed for machining steel are not honed?
paint-brush
when removing chips from a lathe, it is recommended that you use a ________
check centers visually by bring centers together, or check the witness lines on the base of the tailstock for alignment
when the work is turned between centers, a tapered piece will result if the centers are not aligned. what two methods are used to determine approximate alignment?