ME 251 Anupam Saxena Professor Mechanical Engineering Compliant and Robotic Systems Lab Indian Institute of Technology Kanpur

PART AND ASSEMBLY DRAWINGS: EXAMPLE II ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II

PART AND ASSEMBLY DRAWINGS: EXAMPLE II NON-RETURN VALVE 20 φ190 φ140 φ200 140 φ200 140 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by Anupam Saxena, Vitthal Khatik and Ishu Agrawal

PART AND ASSEMBLY DRAWINGS: EXAMPLE II NON-RETURN VALVE φ25 25 45֯ 12 48 φ90 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by Anupam Saxena, Vitthal Khatik and Ishu Agrawal

PART AND ASSEMBLY DRAWINGS: EXAMPLE II NON-RETURN VALVE 6 φ112 45 φ90 φ100 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by Anupam Saxena, Vitthal Khatik and Ishu Agrawal

PART AND ASSEMBLY DRAWINGS: EXAMPLE II φ190 NON-RETURN VALVE φ120 6 HOLES,DIA 18 PCD 150 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II

THREADED FASTENERS Bolts and nuts- size and proportions Representation types:   Detailed B. Schematic C. Simplified D 2D 30o 0.75 D R=1.5D L 2D D D Ref: http://eon.sdsu.edu/~johnston/Eng_Graphics_Essentials_5th_Ed/files/ege/fast/fast_page5.htm

THREADED FASTENERS Bolts and nuts- size and proportions Representation types:   Detailed B. Schematic C. Simplified D 2D 30o 0.75 D R=1.5D L 2D A bit more work but ‘realistic feeling’ D D Ref: http://eon.sdsu.edu/~johnston/Eng_Graphics_Essentials_5th_Ed/files/ege/fast/fast_page5.htm

THREADED FASTENERS Bolts and nuts- size and proportions Representation types:   Detailed B. Schematic C. Simplified D 2D 30o 0.75 D R=1.5D L 2D A LOT more work ‘TRUE LOOK’ D D Ref: http://eon.sdsu.edu/~johnston/Eng_Graphics_Essentials_5th_Ed/files/ege/fast/fast_page5.htm

PART AND ASSEMBLY DRAWINGS: EXAMPLE II NON-RETURN VALVE 28 M10 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by Anupam Saxena, Vitthal Khatik and Ishu Agrawal

PART AND ASSEMBLY DRAWINGS: EXAMPLE II NON-RETURN VALVE 60 20 M16 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by Anupam Saxena, Vitthal Khatik and Ishu Agrawal

NON-RETURN VALVE: ASSEMBLY PART AND ASSEMBLY DRAWINGS: EXAMPLE II COMMON MISTAKES Direction of hatch lines … ? Careful of EXTRA lines when ASSEMBLING The top right corner… Make sure to number parts and prepare the BILL of material ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by Anupam Saxena, Vitthal Khatik and Ishu Agrawal

Revisiting Tolerances Terminology Actual Size – Actual measured dimension of the part. Basic Size – The size with reference to which the limits of size are fixed. Zero Line – It is the straight line corresponding to basic size. Deviations are measured from this line. Tolerance Zero line Basic size Min. Diameter Max. Diameter

Tolerances Limit of Size – The two extreme permissible sizes of a part between which the actual size should lie. Maximum Limit of Size – The greater of the two limits of size. Minimum Limit of Size – The smaller of the two limits of size. Tolerance zone – Difference between the minimum and maximum limit size. Upper Deviation – It is the algebraic difference between the maximum size and the basic size. Lower Deviation - It is the algebraic difference between the minimum size and the basic size. Lower deviation Upper deviation Tolerance Upper deviation Lower deviation Tolerance Zero line Max. Diameter Min. Diameter Basic size

Tolerances Specification of Tolerances Dimensional Geometric Dimensional Tolerance – Amount by which a specified dimension is allowed to vary. Geometric Tolerance – These are applied to features.

Tolerances Specification of Dimensional Tolerances Unilateral Tolerance Bilateral Tolerance Unilateral Tolerance Dimension of part is permitted to vary only on one side of the basic size: 20 0.4 Bilateral Tolerance Dimension of part is permitted to vary both sides of the basic size: 20 -0.3 0.4

Tolerances Designation of Tolerance 25 H 7 f 6 IT Tolerance grade of hole 25 H 7 f 6 IT Tolerance grade of shaft Basic size of hole and shaft Fundamental deviation of hole Fundamental deviation of shaft Details to follow later …

PART AND ASSEMBLY DRAWINGS: EXAMPLE II Think where you would want to provide tolerances ? Guesstimate on what kind? ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II