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1. PART AND ASSEMBLY DRAWINGS
2. SURFACE CHARACTERISTICS
3. DIMENSIONAL TOLERANCES
4. FITS
5. GEOMETRIC TOLERANCES
6. DIMENSIONING
7. THREADED FASTENING
8. SHAFT AND PIPE JOINERS
9. BEARINGS
10. GEARS 1: DEFINITION
11. GEARS 2: HELICAL
12. GEARS 3: BEVEL
13. BELTS AND CHAINS
14. WELDED JOINTS AND RIVETS
4. FITS
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
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
FITS
Industrial Drawing CC 2015 Ramón Rubio
Clearance Fit
Max
imum
clea
ranc
e
Min
imum
clea
ranc
e
FITS
Industrial Drawing CC 2015 Ramón Rubio
Clearance Fit
HOLE HOLE
shaft
shaft
Zero line
FITS
Industrial Drawing CC 2015 Ramón Rubio
Clearance Fit
Zero line
The tolerance of the Clearance Fit is…
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
FITS
Industrial Drawing CC 2015 Ramón Rubio
Interference Fit Maximum
interference Minimum interference
FITS
Industrial Drawing CC 2015 Ramón Rubio
Interference Fit
HOLE HOLE
shaft shaft
Zero line
FITS
Industrial Drawing CC 2015 Ramón Rubio
Interference Fit
Zero line
The tolerance of the Interference Fit is…
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
shaft HOLE
Zero line
FITS
Industrial Drawing CC 2015 Ramón Rubio
Transition Fit
The tolerance of the Transition Fit is…
FITS
Industrial Drawing CC 2015 Ramón Rubio
Shaft system
CLEARANCE FIT INTERFERENCE FIT TRANSITION FIT
FITS
Industrial Drawing CC 2015 Ramón Rubio
Hole system
CLEARANCE FIT INTERFERENCE FIT TRANSITION FIT
FITS
Industrial Drawing CC 2015 Ramón Rubio
FITS
Industrial Drawing CC 2015 Ramón Rubio
Remember the way the tolerance is indicated in parts and fits
FITS
Industrial Drawing CC 2015 Ramón Rubio
What is meant by 40P6/k5?
FITS
Industrial Drawing CC 2015 Ramón Rubio
1. Draw the zero line and the fit sketch
What is meant by 40P6/k5?
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?
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?
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?
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?
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?
FITS
Industrial Drawing CC 2015 Ramón Rubio
The fits in the drawings
FITS
Industrial Drawing CC 2015 Ramón Rubio
General tolerances notes
“All tolerances +- 1mm Unless otherwise noted”
1. PART AND ASSEMBLY DRAWINGS
2. SURFACE CHARACTERISTICS
3. DIMENSIONAL TOLERANCES
4. FITS
5. GEOMETRIC TOLERANCES
6. DIMENSIONING
7. THREADED FASTENING
8. SHAFT AND PIPE JOINERS
9. BEARINGS
10. GEARS 1: DEFINITION
11. GEARS 2: HELICAL
12. GEARS 3: BEVEL
13. BELTS AND CHAINS
14. WELDED JOINTS AND RIVETS
4. FITS
