Sketches, Drawing and Prints and Limits, Fits and Tolerances Flashcards
What are the three (3) types of pictorial drawing?
- Perspective
- Oblique
- Isometric
On what is allowance based on?
MMC- maximum metal condition
Most orthographic drawings show which 3 views?
- Front
- Top
- Right side view
What does ISO stand for?
International Organization for Standardization
The revision block should include?
- A revision Number
- A Description
- A Date
- Who made the changes
An object or visible line is shown as?
Thick Dark Lines
What is CW means?
Clock-Wise
What is a Revision?
is a change or correction on the original drawing
What does CCW stand for?
Counter Clock Wise
How can an (S) shape be distinguished from a (W) shape?
By the Flange Shape
What are the two shapes that have tapered flanges?
“C” and “S” shapes
What is the purpose of a Section Drawing?
it allows you to see inside a work piece
The two types of orthographic projection drawings are?
- First Angle
* Third Angle
What angle of view is the method widely used to draw an orthographic projection print?
Third Angle
Third Angle orthographic projection can be shown by what is called?
A Glass box theory
The typical sectional views are?
- Full section
- Half section
- Removed section
- Revolved section
- Broken-out section
- Offset section
- Aligned section
The intentional difference between mating parts at MMC?
is allowance
What are the three types of fits?
- Clearance fit
- Interference fit
- Transition fit
The variation size of two mating parts from the basic size to the total amount of this permitted variation is called?
Tolerance
The kind of tolerance, where the variation is one direction only is called?
Unilateral tolerance
The type of tolerance with variation in size that can be in either direction from the basic size is called?
Bilateral tolerance
Type of fit when the shaft will always fit into the mating hole at MMC?
Clearance fit
When the shaft diameter is larger than the mating hole diameter?
Interference fit
When the mating parts may have some clearance or some interference when assembled is called?
Transition fit
HRMS
Hot Rolled Mild Steel
SS
Stainless Steel
MS
Mild Steel
MST
Machine Steel
AISI
American Iron and Steel Institute
ANSI
American National Standards Institute
CSA
Canadian Standard Association
SAE
Society of Automotive Engineers
SI
System International
ASSY
Assembly
BC
Bolt Circle
BCD
Bolt Circle Diameter
BHC
Bolt Hole Circle
CLA
Centre Line Angle
TYP
Typical
SF
Spotface
SPEC
Specified
SQ
Square
SYM
Symmetrical
TPF
Taper Per Foot
TPI
Taper Per Inch
TR
Taper Ratio
The arrows on the ends of cutting planes lines are used to?
Show direction to view the sections
Which two (2) sectional view never require a cutting plane line?
- Broken out
* Removed
The six different planes you can draw to view an object are?
- Front
- Right side
- Left side
- Top (plane)
- Bottom
- Rear
A centre line is shown as?
A series of long dashes, separated by short dashes
What is the plane projection on which the front view is projected?
Front Plane
What do break lines do?
Break lines allow long symmetrical shapes to be drawn in less space so that the drawing can be drawn to a larger scale for clarity.
What is considered to be the key view in all cases of an orthographic projection?
Front View
What is the plane projection at which the top view is projected?
On the horizontal plane
When is not necessary to specify the angle of a chamfer?
when the chamfer is external and has an angle of 45 degrees
What material section line is used for majority of parts?
Cast Iron
Why is the isometric type of drawing preferred for the mechanical trades?
because it allows you to measure all dimensions parallel to the three (3) axis and offers less distortion to round objects
A Leader Line terminates with?
- Arrows
- Dots
- Squiggle
Name three (3) of the elements you can use to define a taper
- Large Diameter
- Small Diameter
- Length of Taper
The range of fits created between the maximum and the minimum dimensions of mating parts is?
The Fit Codes
What are the factors that affect the signs, and tolerances of mating parts?
- Load
- Temperature
- Lubrication
- Metal Type
What are the Break Lines?
- Short Break Line
- Long Break Line
- Solid Shaft Break Line
- Hollow Shaft Break Line
The external radius is called?
A Round
The internal radius is called?
Fillet
