LIMITS &FITS
LIMITS
&
FITS
LIMITS‐‐‐ Highlimit
Low limit
Low
limit
FITS
‐‐‐
Clearance fit
FITS
Clearance
fit
Interferencefit
Transitionfit
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Limits & Fits: Understanding Clearance, Interference, and Transition Fits in Engineering, Schemes and Mind Maps of Sport Studies
An in-depth exploration of limits and fits in engineering, focusing on clearance, interference, and transition fits. It covers the concepts of high and low limits, fits types, hole/shaft basis systems, and tolerances. The ISO system of limits and fits is also discussed.
Typology: Schemes and Mind Maps
2021/2022
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LIMITS & FITSLIMITS
FITS
LIMITS
‐‐‐
High
limit
Low limitLow
limit
FITS
‐‐‐
Clearance fit
FITS
Clearance
fit
Interference
fit
Transition
fit
LIMITS & FITSLIMITS
FITS
LIMITS:
‐^
These
are
two
extreme
permissible
sizes
of
dimension
between
which
actual
size
of
dimension
is
contained.The greater
of
these
two
is
called
high
limit
and
the
smaller
low
limit
Terms
used
in
limits
fits:
•^
Shaft
-^
Shaft
-^
Hole
-^
Basic
size
•^
Actual
size
•^
Limits
of
size– HL
LL
•^
Tolerance
HL LL
•^
Tolerance
HL
‐LL
•^
Allowance
Difference
between
MMC
of
mating
parts
Deviation
d
i^
i
•^
Upper
d
eviation
•^
Lower
deviation
•^
Mean
deviation
Zero
Line
Fundamental
Deviation
LIMITS & FITSLIMITS
FITS
HOLE/SHAFT BASIS SYSTEMHOLE/SHAFT
BASIS
SYSTEM
Various
allowances
for
different
fits
maybe
obtained
in
two
ways:
•^
Hole
base
system
•^
Shaft
base
system
HOLE BASIS SYSTEMHOLE
BASIS
SYSTEM
3
HOLE
SHAFT
1
2
1 ‐‐‐
Clearance
fit
2—Transition
fit
3 Interference
fit
SHAFT BASIS SYSTEMSHAFT
BASIS
SYSTEM
•^
SHAFT SIZE IS KEPT CONSTANT & HOLE SIZE ISSHAFT
SIZE
IS
KEPT
CONSTANT
HOLE
SIZE
IS
VARIED
TO
GIVE
VARIOUS
FITS.
•^
BASIC SIZE IS TAKEN AS MAX LIMIT SIZE OF
•^
BASIC
SIZE
IS
TAKEN
AS
MAX
LIMIT
SIZE
OF
SHAFT.LL OF SHAFT AND TWO LIMITS (HL & LL) OF
•^
LL
OF
SHAFT
AND
TWO
LIMITS
(HL
LL)
OF
HOLE
GIVE
THE
DESIRED
FIT.
•^
METHOD
NOT
PREFERRED
IN
LARGE
PRODUCTION
TOLERANCETOLERANCE
P
i^
ibl
i ti
i^
i^
di
i^
i
•^
P
ermissible
variation
i
n
size
or
di
mension
i
s
called
tolerance.
•^
Amount
by
which
a
job
is
allowed
to
go
away
from accuracy without any functional troublefrom
accuracy
without
any
functional
trouble
cm
TOLERANCESTOLERANCES
•^
Each hole has a choice of 18 grades ofEach
hole
has
a
choice
of
grades
of
tolerance i.e. IT01,ITO,IT1 to IT16 (Similarly fortolerance
i.e.
IT01,ITO,IT
to
IT
(Similarly
for
shafts)shafts)
-^
Tolerance grades decide the accuracy of
-^
Tolerance
grades
decide
the
accuracy
of
manufacturemanufacture