TECHNICAL DRAWING FOR MECHANICAL ENGINEERING

Technical ec ca d drawing a g fo for mechanical ec a ca eengineering g ee g

TO LEARN MORE ABOUT M d l 2 : Frequently Module F Frequentlytl -Used U d Standarized St d i d Parts P t

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Technical ec ca d drawing a g fo for mechanical ec a ca eengineering g ee g

AS WE PRESENTED IN OUR VIDEO IN MODULE 2 - FREQUENTLY FREQUENTLY--USED STANDARIZED PARTS

UNIT 3: GEARS THERE ARE SOME DIMENSIONS IN THE DRAWING OF A GEAR WHEEL THAT MUST BE CALCULATED WITH A FORMULA

Module 2   Module  2  Frequently Frequently‐‐Used Standarized Parts TO LEARN MORE: FORMULAS  FORMULAS FOR  FOR GEARS GEARS

Technical ec ca d drawing a g fo for mechanical ec a ca eengineering g ee g

SPUR GEARS PARAMETERS

n rotational frecuency Z number of teeth GR gear ratio

GR=n1/n2 =

Z2/Z1

n1 Drive  Drive wheel wheel rotational frequency n2 Driven Di wheel h l rotationañ t ti ñ frequency f

In this case GR > 1

n1 > n2 Z2 > Z1

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Technical ec ca d drawing a g fo for mechanical ec a ca eengineering g ee g

dp diameter pitch circle

outside or addendum circle

p pitch circle

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Technical ec ca d drawing a g fo for mechanical ec a ca eengineering g ee g

Z number of teeth =4

Πx dp

(LENGTH OF PITCH CIRCLE)

= px px44 Πx dp= px pxZ Z DEFINITION Module   

m

m=p/ m= m p/Π p/ Π=dp dp//Z

m

Module    has standard values and it is equal for both wheels 1 1=

m=dp m= d /Z dp dp d 2/Z2

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Technical ec ca d drawing a g fo for mechanical ec a ca eengineering g ee g

addendum,, a = m (module) addendum

Outside diameter D0 =dp d + 2a 2

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Technical ec ca d drawing a g fo for mechanical ec a ca eengineering g ee g Outside diameter D0 =dp p + 2a AS WE HAVE SEEN IN THE CORRESPONDING VIDEO, THE OUTSIDE (ADDENDUM) DIAMETER MUST BE DIMESIONED

m=p/ m= p/Π Π=dp dp//Z

addendum,, a = m (module) addendum

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Technical ec ca d drawing a g fo for mechanical ec a ca eengineering g ee g

PITCH DIAMETER MUSN´ MUSN´T BE DIMENSIONED.

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Technical ec ca d drawing a g fo for mechanical ec a ca eengineering g ee g IT IS IMPORTANT

C=

dp1+dp2 2

LATER IT WILL BE EXPLAINED WHY IT IS IMPORTANT

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