CCD103/104 Threads, fasteners, and springs
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45 Terms
What are the three basic applications of screw and threads?
to hold parts together
to provide for adjustment between parts
to transmit power
Label the thread
A: Depth D
B: Crest
C: Root
D: Side
E: Minor Dia K
F: Pitch Dia E
G: Major Dia - D
H: Pitch - P
I: Thread angle
What kind of thread is this?
Sharp V
What kind of thread is this?
Metric
What kind of thread is this?
Whitworth standard
What kind of thread is this?
American National
What kind of thread is this?
Square
What kind of thread is this?
Knuckle
What kind of thread is this?
Unified (external)
What kind of thread is this?
Acme (general-purpose)
What kind of thread is this?
Butress
How is thread pitch measured in America?
It is measured by how many threads there are in one inch
The pitch of any thread form is the distance parallel to the axis between corresponding points on adjacent threads.
Definition of pitch
How is pitch measured in the metric system
it is the distance from one thread to another (pitch)
How can pitch be measured?
The pitch or the number of threads per inch can be measured with a scale or with a thread pitch gage
What is the difference between right-handed and left-handed threads
right hand thread advances into a nut when turned clockwise
left hand thread advances into a nut when turned counterclockwise
What are the American National Thread fits?
Class 1 fit
Class 2 fit
Class 3 fit
What is the Metric Unified Thread Fits?
6H for internal threads
6g for external threads
What kind of thread drawing is this?
Detailed thread drawing
What kind of thread drawing is this?
Schematic thread drawing
What kind of thread drawing is this?
Simplified thread drawing
Label the picture with the correct notes
label the thread notation
which way does the slope go for right-hand thread lines in a detailed drawing
upward
which way does the slope go for left-hand thread lines in a detailed drawing?
downward
what is this drawing showing?
The use phantom lines to save time when representing identical Features Threaded shafts and springs may be shortened without using conventional breaks but must be correctly dimensioned.
what is this drawing showing?
Threads in an assembly - when external and internal threads are sectioned in assembly the V’s are required to show the threaded connection
What is this?
Bolt
What is this?
Cap Screw
What is this?
stud
Should bolts, nuts and screws be sectioned in an assembly drawing?
no, they are not sectioned
Does the tap drill depth include the point of the drill?
No, it does not include the point of the drill
What is a tapped hole?
a tapped hole is when an ordinary drill is used to make holes that will be tapped/threaded - it is also known as a threaded hole - tapping is the process of creating internal threads within the internal sides of a hole
What are locknuts and locking devices?
They are special nuts that prevent nuts from unscrewing
What are cap screws?
finished and are used on machine tools and other machines when accuracy and appearance are important
What are standard Machine screws?
to cap screws, but they are usually smaller, and the threads generally go all the way to the head
What is a set screw?
screwed into one part so that its point bears firmly against another part. If the point of the set screw is cupped or if a flat is milled on the shaft the screw will hold much more firmly
How many types of American National standard wood screws are there? What types of heads do they have?
there are three kinds of wood screws, and they are flat found and oval heads
What is the purpose of Keys?
Keys are used to prevent movement between shafts and wheels, couplings cranks, and similar machine parts attached to or supported by shafts
What do machine pins include? What can they be used for?
they include straight pins, dowel pins, clevis pins, and cotter pins. They can be used to fasten hubs or collars to shafts
What are springs designed for?
They are designed to store energy when deflected and to return the equivalent amount of enege4ry when released
how does the buttress thread transmit power?
it transmits power in only one direction
how does the square thread transmit power?
in both directions
What kind of thread is agreed upon by the US, Europe and Canada
unified
what are rivets used for?
permanent fastenings unlike removable fastening like bolts and screws