Conventional Practices 1 Conventional Practices At times it

Conventional Practices 1

Conventional Practices At times it is necessary to depart from the exact rules of projections for the sake of increased clarity, or savings in drawing time and effort (without sacrificing clarity of communication). 2

Fillets and Rounds Exterior corners unsafe Exterior corner unpleasant Rounded external corner is called a round 3

Fillets and Rounds High cost of interior corners Weakness in interior corners Rounded internal corner is called a fillet 4

Fillets and Rounds are very common because of the requirements of manufacturing processes. It is very difficult to get sharp corners in components made by forging, casting, or bending of sheets. 5

This corner not rounded because the base of the bracket must be milled flat to sit on a mating surface Fillet . . Round 6

Rounded internal corners do not project properly 7

All rounded corners formed by unfinished surfaces are shown broken. 8

True projection Add line to show change of direction No line- poor practice From rounded corners 9

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Conventional Practices: Run-outs 11

Run-outs Note: The Indian standards define this convention for the threaded hole 12

Run-outs 13

Conventional Practices: Run Outs for Intersecting Fillets and Rounds 14

Unnecessary details 15

Conventional Practices: 16

But do not conventionalize everywhere Difference between true and conventional is far too great 17

Unnecessary details 18

Conventional Practices: 19

But do not conventionalize everywhere Difference between true and conventional is far too great 20

But do not conventionalize everywhere Note: a small gap to denote that this edge is filleted! Difference between true and conventional is far too great 21

Conventional Practices: Treatment of Unimportant Intersections 22

Conventional Practices: Treatment of Unimportant Intersections Preferred Treatment 23

Conventional Practices: Treatment of Unimportant Intersections Preferred Treatment ETL 01 -VI- 24

Conventional Practices: Ribs 25

Conventional Practices: Ribs 26

Conventional Practices: Lugs 27

Conventional Practices: Lugs 28

Conventional Practices: Aligned features 29

Conventional Practices: Rotation of Features 30

Conventional Practices: Radial Holes 31