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WorksheetsDrill Bushes, Tolerances and materials used
Total questions: 14
Worksheet time: 5mins
What is equal to the differences between the two limits of size of the part?
Tolerance
Low limit
High limit
Design size
The relationship that results between the two mating parts before assembly is called ______.
tolerance
allowance
limit
fit
Why tolerances are given to the parts?
Because it’s impossible to make perfect setting
To reduce weight of the component
To reduce cost of the assembly
To reduce amount of material used
Which type of tolerance provided in drilling mostly?
Bilateral
Unilateral
Trilateral
Compound
Which of the following is incorrect about tolerances?
Too loose tolerance results in less cost
Tolerance is a compromise between accuracy and ability
Too tight tolerance may result in excessive cost
Fit between mating components is decided by functional requirements
Which of the following option is true for given statements?
Statement 1: Bilateral tolerances are used in mass production techniques.
Statement 2: The basic size should be equal to upper and lower limits.
T, T
F, T
F, F
T, F
If a clearance fit is present between shaft and hole, what is the tolerance on shaft or hole for a complete interchangeable approach?
½ of maximum clearance – ½ of minimum clearance
¼ of maximum clearance – ¼ of minimum clearance
Maximum clearance – minimum clearance
¾ of maximum clearance – ¾ of minimum clearance
Which among the following is the purpose for providing bushings in a drill jig ?
For locating accurately and guiding the drill for precise drilling operation
For determining the size of the hole to be drilled
For getting good finished surface in the drilled holes
For easy drilling
Drill jig bushings are normally hardened to
Protect the jig from damage
Ensure prolonged life without wear and tear so as to guide the tool accurately
Guide the tool so that it does not go inclined
Allow the chips to come out easily
Drill jig bushings are generally made of
Cast steel
Tool steel
Cast iron
Mild steel
Plain drill jig bushings are generally secured in the body of jig so that the bushings should not
Vibrate, rotate and be withdrawn while in operation
Rotate when the tool is rotating
Vibrate while in operation
Get withdrawn with the tool
Which one of the following bushings is used to locate the renewable bushings
Special bushing
Press fit bushing
Liner bushing
Knurled bushing
Slip renewable bushings are used when
Many holes of various sizes are to be drilled on a jig in different settings
More than one operation has to be performed through the same location of the jig
One operation is to be performed in each hole but several bushings must be used during the life of the jig
No bushing change is required
Fixed renewable bushings are used when
Many holes of various sizes are to be drilled on a jig in different settings
More than one operation has to be performed through the same location on the jig
One operation is to be performed but several bushings must be used during the life of the jig
No bushing change is required
