ENGINEERING DRAWING

Engineering Drawing

Engineering Drawing is an Universal Language of Engineers to transfer Ideas.

Here there are lots of Different type of Sketch (projection) you can differentiate.
Prospective Projection :approximate representation view as you see by eye

Auxiliary View : use full in dislocation of portion (X-RAY)

Orthographic projection : visual ray line , parallel to each other

obliq and axonometric views : 3 view drawing

3 Principle plane
Frontal
Horizontal
Profile

Sphere has only ONE VIEW

Europe usually use :First angle view
Protector : 0.5 Degree Smallest Angle
Drafting Scale: Triangle is not available
Light Weight pencil : H
Drawing sheet Ration : 1: root2
Elevation = Top view Elevation on Vertical Plane

SHEET
A5 : 148 X 210
A4 : 210 X 297
A3 : 297 X 420
A2 : 420 X 594
A1 :594 X 841
A0 : 841 X 1189

Letter in Dwg : 7:4
3H,4H Pencil for : Center line
PENCIL IN ORDER : 18 Light Dark
9H,8H,7H,6H,5H,4H,3H,2H,H,F,HB,B,2B,3B,4B,5B,6B,7B
Drawing board Made by Ebony Material

There are Eight Types of Line
1. Continuous
2. Continuous thin
3. Short Dash
4. Long Chain
5. Chain Thick End
6. Short Chain
7. Continuous Wavy
8. Straight zig zag

ENGINEERING CURVE
e= Eccentricity
e=0, Circle
e=1 ,parabola
e<=1 , ellipse
e=>, Hyperbola

Two type of View
1. First Angle
2. Third Angle

in third Angle ( 2nd and 4th Quadrant is not used Because Top view and Front view overlap)
Top view = on Horizontal Plane
Front View = on Vertical Plane

Pictorial Projection
1. Isometric Projection (30 Degree to HP)
2. Oblique Projection (45 Degree to HP)
3. Perspective Projection

https://youtu.be/69wgGf5xR5k

Comments

Important point of Strength of material

Important point of Strength of material Stress : P/A =N/mm2 Strain : Change in length / original length = No unit Hook's law = good for elastic limit Modulus of elasticity = linear stress/linear strain Poison ratio : lateral strain / linear strain (Max. = 0.5) E = 210 kN/mm2 Strain roseter = used to measure liner strain. Max. stress at smaller end in tapper bar bolt pass through pipe both are tightly fitted with nut and washer so bolt in tension tube in compression bar cooled at -5 degree c it develop tensile stress. Energy stored in body = strain energy Total strain energy stored in body = Resilience Max. strain energy stored in body = Proof resilience Proof resilience / Unit volume = Modulus of resilience Strain energy suddenly loaded = 4 x Gradually loaded Contraflex point = bending moment change sign (overhanging beam)(simply supported beam) Shear force = 0, Bending moment = max Bending moment at fix end = max In pure bending = bending is c...

Strength of Material

Strength of Material Mechanical Properties Hardness ;Resist the penetration (impact load) Strength : Ability of material withstand of material without failure. Elasticity : It regain the original shape after removing load Plasticity : Permanent deformation after removing load. Mali ability : Converts to thin sheet without rupture Ductility : Draw in to thin wire. Brittleness : No deformation takes place & rupture (lake of ductility ) (cast iron) Toughness : absorb energy & plastic deformation without rupture. Fatigue: by repeatedly applied load program me and localized structure damage that occur. Creep : tendency of solid material to move slowly deform permanently under mechanical stress. Stress : Load applied on particular area. it is tensor quantity unit : N/mm2 Strain : Change in length to original length when force applied on body. it has no unit. Strength of Material Tensile : when body is subjected to equal and opposite ...

Hydraulic & Fluid Mechanics

Hydraulic & Fluid Mechanics Density/Mass density : mass/unit volume at standard temp and pressure. rho =M/V unit: kg /me Weight density/specific weight : weight /unit volume at standard temperature and pressure. w=rho x g unit : N/me Specific volume : volume/unit mass of liquid v=V/m unit : m3/ kg Specific gravity : it is defined as specific weight of liquid to specific weight of pure water at 4 degree C it has no unit Viscosity : it offers resistance to movement of one layer of liquid to another layer Compressibility : properly change in volume to change in pressure. it is reciprocal of bulk modulus of elasticity. Surface tension : property of liquid which enables to resist tensile stress denoted by sigmaunit : N/m Capalary : phenomena of rise /fall of surface in small tube held in liquid relatives. Pressure of liquid : When liquid contained in vessel it exerts at all points on side & bottom of vessel force per uni...

The Mechanicals

Search This Blog