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ME 251

Learn how to create part and assembly drawings for a non-return valve. Includes examples, threaded fasteners, and revisiting tolerances.

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ME 251

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  1. ME 251 AnupamSaxena Professor Mechanical Engineering Compliant and Robotic Systems Lab Indian Institute of Technology Kanpur

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

  3. NON-RETURN VALVE 20 φ190 φ140 φ200 140 φ200 140 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by AnupamSaxena, VitthalKhatik and IshuAgrawal

  4. NON-RETURN VALVE φ25 25 45֯ 12 48 φ90 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by AnupamSaxena, VitthalKhatik and IshuAgrawal

  5. NON-RETURN VALVE φ112 6 45 φ90 φ100 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by AnupamSaxena, VitthalKhatik and IshuAgrawal

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

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

  8. THREADED FASTENERS Bolts and nuts- size and proportions Representation types: Detailed B. Schematic C. Simplified D 2D 0.75 D 30o 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

  9. THREADED FASTENERS Bolts and nuts- size and proportions Representation types: Detailed B. Schematic C. Simplified D 2D 0.75 D 30o 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

  10. NON-RETURN VALVE 28 M10 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by AnupamSaxena, VitthalKhatik and IshuAgrawal

  11. NON-RETURN VALVE 60 20 M16 ANUPAM SAXENA ME 251 LECTURE III PART AND ASSEMBLY DRAWINGS: EXAMPLE II Prepared by AnupamSaxena, VitthalKhatik and IshuAgrawal

  12. NON-RETURN VALVE: ASSEMBLY 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 AnupamSaxena, VitthalKhatik and IshuAgrawal

  13. 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

  14. 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 Upper deviation Tolerance Lower deviation Tolerance Zero line Max. Diameter Min. Diameter Basic size

  15. 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.

  16. 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: 0.4 0.4 20 20 0 -0.3 Bilateral Tolerance Dimension of part is permitted to vary both sides of the basic size:

  17. Tolerances Designation of Tolerance 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 …

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

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