L- Chucks and Thread Milling Flashcards
In order to accommodate a number of different work holding devices it is common practice to fit a _______ to the spindle nose using the appropriate attachment method
BACKPLATE
Studs that are attached to an adapter plate
CAMLOCK studs
Allows the chuck to easily attach or release by sequentially rotating cams in the BACKPLATE
KEY
Is attached to the main spindle of a lathe and plays the role of transmitting the rotation of the spindle to the workpiece and of holding the workpiece tightly so that the workpiece, which is rotating at a high speed, does not fly away due to centrifugal force.
CHUCK
Fitted to the rear of a work holding device and consists of a ring of CAMLOCK studs
ADAPTER PLATE
The output end of a ______ _______ terminates with the SPINDLE _____
LATHE SPINDLE, NOSE
Types of Spindle Noses
L-Type Long Taper Key Drive Spindle Nose
Threaded Spindle Nose
The most common type of work holding device used on LATHES is the
3-JAW SELF-CENTERING CHUCK
Moves the three jaws of a 3-JAW SELF-CENTERING CHUCK together towards or away the center by rotating in a given direction. Tightens and loosens the jaws.
CHUCK KEY
Actuates the jaw motion
SCROLL GEAR
Drives the SCROLL GEAR along with a square drive socket
PINION/CROWN GEAR SET
The most common stock used in a 3-JAW SELF-CENTERING CHUCK
Hexagonal barstock
Square or octagonal stock requires a
4-JAW SELF-CENTERING CHUCK
Why is it not typical to use a 4-JAW SELF-CENTERING CHUCK
Rarely used
Expensive
What is used instead of the 4-JAW SELF-CENTERING CHUCK
4-JAW INDEPENDENT CHUCK
Used in a 4-JAW INDEPENDENT CHUCK to move each of the four jaws independently of one another
WORM GEAR
Profile of a barstock on a chuck
FACING
The 4-JAW INDEPENDENT CHUCK can grip ____ because its jaws move independently
RECTANGLES
SQUARES
Device used to adjust and center the jaws of a 4-JAW INDEPENDENT CHUCK
Dial Test Indicator or Dial Gage
The 4-JAW INDEPENDENT CHUCK can hold pieces concentrically and
eccentrically
Types of barstock that can be held eccentrically on a 4-JAW INDEPENDENT CHUCK
ROUND barstock (most common)
SQUARE barstock
RECTANGULAR barstock
What machine reduces the likelihood of an accident with a CHUCK KEY?
CNC LATHES
What does the CHUCK KEY hit before bouncing with high energy to strike the operator’s jaw?
LATHE BED
What prevents 3 and 4-JAW CHUCKS from running perfectly true or with positional repeatibility?
complexity
slippage and marring of the part surface
What solves the complexity and slippage and marring of the part surface issues with the 3 and 4-JAW CHUCKS?
COLLET CHUCK
A metal cylinder with a flared taper end designed to mate with the chamfered bore in the body
COLLET
Why is an entire set of collets needed? ex. 5C Collet Set
The range of finger flexibility to grip a workpiece is limited which makes a set needed to cover a wide range of grip diameters
TRUE or FALSE:
It is possible to use a COLLECT CHUCK for eccentric workpieces
FALSE, only concentrical
A long rod which passes through the hollow spindle and into the rear of the COLLET CHUCK. Pushes or pulls to actuate the gripping/releasing functions respectively.
DRAW BAR
The best type of chuck to use in an automated CNC LATHE. Hydraulically actuated 2-JAW CHUCK.
INDEXING/INDEXABLE CHUCK
Aids in positioning an INDEXING/INDEXABLE CHUCK
INDEXING JAW
Aids in clamping an INDEXING/INDEXABLE CHUCK
GRIP JAW
Used for holding the shank of a drill
JACOBS CHUCK/ DRILL CHUCK
Designs that are tightened and loosened by hand simply by rotation of an outer knurled sleeve
KEYLESS
Designed to grip exceedingly small diameter drill shanks. Comes with its own straight shaft that is big enough to be gripped by a JACOBS CHUCK
PIN CHUCK
Produces precision threads of inferior strength compared to ROLLED THREADS. Can be performed on a LATHE.
THREAD CUTTING
To perform THREAD CUTTING on a LATHE there must be coordination between the workpiece rotational ______ and the cutting tool _____ rate
SPEED, FEED
Standard cutting device for THREAD CUTTING
SPCT (SINGLE POINT CUTTING TOOL)
Precision ground tool that mimics a bank of SPCT all side-by-side at the correct pitch
THREAD CHASER
Type of THREAD CHASERS that cuts external threads
TANGENTIAL-TYPE
Type of THREAD CHASERS that cuts internal threads
CIRCULAR TYPE
Holds and turns each die in a THREAD CUTTING DIE
DIE WRENCH
Device which allows external threads to be cut by hand
THREAD CUTTING DIE
Holds and turns each die in a TAP
TAP WRENCH
Device which allows internal threads to be cut by hand
TAP
Internal threads can also be cur with a TAP on a
MACHINE TOOL
The FEED slows to a stop and reverses direction at the bottom of the hole, while the SPEED slows and reverses as well
RIGID TAPPING
Alternative to RIGGID TAPPING
Device that utilizes a special FLOATING CHUCK to take care of the FEED/SPEED mismatch in the controlling by allowing the TAP to disconnect from the drive and feed itself at the end of its travel
FLOAT TAPPING
Special CHUCK that has a built in compliance (slop) in the transmission
FLOATING CHUCK
Process to thread large diameter holes without a TAP
THREAD MILLING
Cutting tool used to thread large diameter holes without a TAP. Has a diameter small enough for it to be fed into a precut hole without touching the internal bore at first.
THREAD MILL
