2. FITS
Industrial Drawing
CC 2015 Ramón Rubio
What if we join two pieces together?
CLEARANCE FIT
HOLE > SHAFT
We will have three cases depending on the fit
INTERFERENCE FIT
HOLE < SHAFT
TRANSITION FIT
HOLE = SHAFT
Maximum clearance
Minimum clearance
Maximum interference
Minimum interference
Maximum clearance
Maximum interference
3. FITS
Industrial Drawing
CC 2015 Ramón Rubio
Clearance Fit
A fit between mating parts
having limits of size so
prescribed that a
clearance always results
in assembly.
Clearance
7. FITS
Industrial Drawing
CC 2015 Ramón Rubio
A fit between mating
parts having limits of size
so prescribed that an
interference always
results in assembly
Interference Fit
Interference
11. FITS
Industrial Drawing
CC 2015 Ramón Rubio
A fit between mating parts having limits of size so
prescribed as to partially or wholly overlap, so that either
a clearance or an interference may result in assembly.
Transition Fit
shaft shaft
shaftHOLE
Zero line
19. FITS
Industrial Drawing
CC 2015 Ramón Rubio
2. Find both TOLERANCES (IT grade-basic size table)
1. Draw the zero line and the fit sketch
What is meant by 40P6/k5?
20. FITS
Industrial Drawing
CC 2015 Ramón Rubio
2. Find both TOLERANCES (IT grade-basic size table)
1. Draw the zero line and the fit sketch
IT6 16µ
ø40
IT5 11µ
ø40
What is meant by 40P6/k5?
21. FITS
Industrial Drawing
CC 2015 Ramón Rubio
2. Find both TOLERANCES (IT grade-basic size table)
1. Draw the zero line and the fit sketch
IT6 16µ
ø40
3. Evaluate deviations (fundamental deviation table)
IT5 11µ
ø40
What is meant by 40P6/k5?
22. FITS
Industrial Drawing
CC 2015 Ramón Rubio
2. Find both TOLERANCES (IT grade-basic size table)
1. Draw the zero line and the fit sketch
IT6 16µ
ø40
3. Evaluate deviations (fundamental deviation table)
P6 ES=-21µ | EI=-21-16=-37µ
ø40
IT5 11µ
ø40
k5 ei=2µ | es=2+11=13µ
ø40
What is meant by 40P6/k5?
23. FITS
Industrial Drawing
CC 2015 Ramón Rubio
2. Find both TOLERANCES (IT grade-basic size table)
1. Draw the zero line and the fit sketch
IT6 16µ
ø40
3. Evaluate deviations (fundamental deviation table)
P6 ES=-21µ | EI=-21-16=-37µ
ø40
4. Answer:
AM=es-EI=13+37=50µ
Am=ei-ES=2+21=23µ
IT5 11µ
ø40
k5 ei=2µ | es=2+11=13µ
ø40
What is meant by 40P6/k5?