Machine Shop Flashcards
What is the formula for spindle rpm
3.82 x cutting speed / diameter of work
What is UNC
Unified National Coarse
What is UNF
Unified National Fine
What is UNEF
Unified National Extra Fine
What are the three types of tooth set blades
raker, wavy, alternate
One of the most important factors in successful band sawing is a
proper cutting speed
What are some advantages using a circular saw
burr free mill finish, cuts of extreme accuracy
what do you call a multisided tool to which a number of different cutting tools are attached
turret
what is the process for final finishing to close dimensions
grinding
where there is a high degree of precision and surface finish and surface finish is needed
lapping
T or F drilling machines is much broader in meaning and includes all types of machines designed for drilling
True
What are the 3 parts of a drill press
Head, spindle, table, base
What is the purpose of a center punch
center punch is used to make an indentation for the drill point at the center to aid the drill in getting started
What are the main parts of the twist drill
shank, body, point
what are twist drills made of
carbon steel, high speed steel
Normal purpose angle of a twist drill is
118 degrees
T or F
High speeds and light feeds are recommended for automatic drilling machines where holes don’t exceed four drill diameters in depth
T
a tool that makes a taper or bevel the end of a hole is a
countersink
what is a drill drift
removes twist drills sleeves and sockets from drill press spindle
used to raise work above the drill press table to not damage vise or table
parallels
manufacturers use this term to designate maximum diameter of the work can be machined
swing
T or F
Carriage assembly is the entire unit that moves lengthwise along the ways between headstock and tailstock
True
T or F
Feed is distance that a tool advances work during half revolution
False (one revolution)
what tool is used to machines the ends of the work and to machine shoulders
facing tool
In straight turning between centers cutting edge of the tool should be set
5 degrees above center
T or F
The distance from a point on a screw thread to a corresponding point on a adjacent thread measured parallel to the axis is called pitch
True
T or F
For right hand threads the carriage must travel toward the headstock
True
what does the steady rest support
long stock
many injuries caused to the hand by
bind and twist
What are the three high production machines
turret lathes, multi tool, and multi spindle
what tool removes alot of metal
rough cut tool
what attachment is widely used method of machining tapers
taper attachment
turret lathes are classified as
vertical or horizontal
knee and column mill is classified as
horizontal or vertical
T or F
knee and column milling machine used more frequently in tool and die shops
True
machines depends on being kept clean to improve
accuracy and durability
various methods of mounting work on the milling machine for machining are
table, chuck, arbor
why is it bad to have dull cutters
dull cutters wears more rapidly, does not last as long
what are the two types of grinding
precision and non precision
T or F
Surface grinders are used for grinding precision parts
True
What does CNC stand for
Computer Numerical Control
