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WorksheetsEMM Chapter 1 System of Limit & Fit
Total questions: 15
Worksheet time: 7mins
Basic size is
the size of the component by actual measurement after it is manufactured
a number expressed in a particular unit in the measurement of length
the size based on which the dimensional deviations are given
the extreme permissible sizes within which the operator is expected to make the component
There are three (3) types of fit which are:
Interference
Allowable
Transition
Clearance
Press fit, heavy drive fit, and shrink fit are examples of
Clearance fit
Transition fit
Interference fit
Choose the disadvantages of limits, fits, and tolerance.
The cost of pieces is reduced
Initial expenditure will be very high
Jigs and fixtures are needed
Special purpose machines are necessary
Which one of the following is INCORRECT?
Lower deviation is the algebraic difference between minimum limit of size and its corresponding basic size
Upper deviation is the algebraic difference between minimum limit of size and its corresponding basic size
Deviation is the algebraic difference between a size, to its corresponding basic size. It may be positive, negative or zero
Actual deviation is the algebraic difference between actual size and its corresponding basic size
All internal features of a component including those which are not cylindrical is called
shaft
workpiece
limit
hole
....................... is where the size of the hole is kept constant and the size of the shaft is varied to get the different class of fits.
Hole basis system
Shaft basis system
Limit basis system
Tolerance basis system
The feature has basic size of 37.00, the upper limit of 37.50 and the lower limit of 37.40. It falls under
Tolerance limits
Bilateral limits
Unilateral limits
The feature has an upper limit of 25.18 and lower limit of 25.10. The tolerance is
0.15
0.10
0.05
0.08
The figure shows the
Unilateral limits
Bilateral limits
Tolerance limits
The hole has an upper limit of 46.23 and lower limit of 46.20 while the shaft has an upper limit of 46.17 and lower limit of 46.15. The suitable type of fit is
transition
interference
clearance
The followings are the elements of transition fits
Easy Push Fit
Force Fit
Loose Running Fit
Light Press Fit
Choose the correct fit of transition.
Hole: U - 23.20 L - 23.17, Shaft: U - 23.15, L - 23.13
Hole: U - 23.14 L - 23.11, Shaft: U - 23.18, L - 23.15
Hole: U - 23.18 L - 23.13, Shaft: U - 23.15, L - 23.10
Hole: U - 23.18 L - 23.17, Shaft: U - 23.16, L - 23.15
Find the tolerance of hole with diameter of 50mm at H7/r6
0.01
0.03
0.15
0.30
Find the tolerance of the feature of diameter 135mm of easy running fit
0.033
0.055
0.060
0.063
