Method

METHOD OF MODELLING HELICAL GEAR ON SOLID WORKS SOFTWARE
1 | P a g e 4 S e p t e m b e r 2 0 1 4
1) First step: Draw all necessary parameter sketches in one stretch and make them construction
(hidden) entities ,except a feature entity see the sketch below .
WE CAN ADD FORMULAE TO EACH DIMENSIONAL PARAMETER
EX:“MODULE” AND “NO OF TEETH” ARE VERIABLE AND ALL OTHER PARAMETERS CAN BE FARMULATED
REALTIONS ACCORDING TO “WESTERMANN TABLE” (FOR METAL TRADE) ,REVISED SECOND EDITION
PAGE NO 70
PITCH = MODULE X PI
ADDENDUM CIRCLE DIA=PITCH CIRCLE DIA + (2XMODULE)
PITCH CIRCLE DIA = NO OF TEETH X MODULE
DEDUNDUM CIRCLE DIA = 1.2 X MODULE

2 | P a g e 4 S e p t e m b e r 2 0 1 4
2) SECOND STEP: CALCULATION OF TEETH FROFILE
TEETH THICKNESS DEPENDS ON
CIRCULAR THICKNESS ANGLE =(( 360/NO OF TEETH)X0.5 )DRAW 2 HIDDEN LINES FROM THE
CENTER OF SKETCH.

3 | P a g e 4 S e p t e m b e r 2 0 1 4
DRAW TANGENT LINE “D” TO PITCH CIRCLE FORM INTERSECTION OF LINE “B” AND “PITCH
CIRCLE”
DRAW “E” 20* ANGLE LINE TO TANGENT LINE “D” FROM INTERSECTION OF LINE “B” AND PITCH
CIRCLE
DRAW CIRCLE “F” WHOSE DIA IS 1/4 OF PITCH CIRCLE DIA
DRAW TANGENT CERCLE “G” TO LINE “E” (PREASSURE ANGLE LINE20DEG)
DRAW CIRCLE “H” ,WHOSE CENTER IS AT (FROM INTERSECTION POINT “I” AND CIRCLE “G”) TO
THE INTERSECTION POINT OF LINE “B” AND “PITCH CIRCLE DIA”
THIS IS ABSOLUTELY A ANALYTICAL METHOD TO GET A FORM AND SHAPE
3) THIRD STEP:EXTRUDE DEDUNDUM TO REQUIRED HEIGHT AND ADD IT TO EQUATIONS IN SOLID
WORKS
KNOW ADDING PARAMETERS TO” EQUATIONS “ IN SOLID WORKS ,SO THAT ANY ONE CAN USE
MY METHOD TO GET STANDERD HELICAL GEAR (YOU CAN MODIFY AT ANY POINT OF TIME IT
IS LIKE A CEMENT ON IRON(IT WILL NEVER LEAVE RELATION).

4 | P a g e 4 S e p t e m b e r 2 0 1 4
4) Fourth step: see the fig below in TOOLS menu we have “Equations) click on that you get
Equations dialog box to add parameters and equations
Before Adding Dimensional Parameters we can change the name of parameter ,so that we can
easily identify particular parameter of a model in equations dialog box.See fig below.
First pick the dimension, it changes color from black to green then click on more properties,
dialog box appears .Hear in the Name Box We can add ADDENDUM .This will make easy to
identify the particular parameters to Edit.

5 | P a g e 4 S e p t e m b e r 2 0 1 4

6 | P a g e 4 S e p t e m b e r 2 0 1 4
ADDENDUM is added to the Equations and we can Equate that parameter to the module and
pitch circle as we have discussed earlier .in page 1

7 | P a g e 4 S e p t e m b e r 2 0 1 4
Same way WE can add parameters of Features also see the fig.
Double click on feature it will turn green and dimension of feature (eg : Extrude 6mm)
Will appear in blue see fig below
Just pick the dimension and change the name as thickness of gear
In same way that will be added to the equations and we can relate it to module by formulae
Eg: Thickness = 6 x Module
See below fig go to “Tools” “Equations “pick feature dimension and “add “it will ask value .We
can know add relation or equation by 2 methods
Write equations by manually typing dimension name as in the “dimension property manager”
Or we can pick other parameters (dimensional) to complete the equation. Like this we can add
Equations of features and modify them at any point of time.
Feature Dim

8 | P a g e 4 S e p t e m b e r 2 0 1 4
5) FIFTH STEP: AFTER ADDING ALL PARAMETERS TO “EQUATIONS GETTING GEAR TEETH PROFILE
Fig .BELOW SHOWS GEAR TOOTH PROFILE.
A) DRAW ARC CONSTRAINED TO CIRCLE “H”.
B) MIRROR IT BY LINE “A”.
C) COMPLETE THE PROFILE USING ‘ADDENDUM” AND “DEDUNDUM” CIRCLES.
D) SWEEP PROFILE WITH HELIX TO GET ONE TEETH.
6) SIXTH STEP: TO GET A HELIX ON PERIPHERY OF DEDUNDUM WE CAN USE FORMULAE
LEAD = tan(helix angle) x π(dia of dedundum circle)
WHERE HELIX ANGLE IS CONSTANT AND DEDUNDUM IS EQUATED BY FORMULAE
TO CREATE HELIX OF LENGTH EQUAL TO GEAR THIKNESS ABOVE FAORMUALE IS USED.
SEE BELOW fig.
DEDENDUM
ADDENDUM
ARC

9 | P a g e 4 S e p t e m b e r 2 0 1 4
a) Draw circle on face of dia equal to dedundum
b) Use helix command (defined by height and pitch).see fig below
c) In height 6mm(thickness of gear) will be equated
d) In pitch the value 469.2703262 is equated by formulae (LEAD = tan(helix angle) x π(dia of
dedundum circle)
e) Start angle is 90◦
So we get helix profile like this.see equation table also.

10 | P a g e 4 S e p t e m b e r 2 0 1 4
a) Lead is equated see below.
b) Pressure angle is constant and value can be changed.
c) See height of helix is equated to gear thickness
d) Pressure angle can be changed
e) Finally we can get helical gear which can be modified by varying only 4 parameters
f) “ NO OF TEETH”,”MODULE””FILLET RADIOUS” AND ANY CONSTANT LIKE “HELIX ANGLE”

11 | P a g e 4 S e p t e m b e r 2 0 1 4
Final product can be used for standard and unstandardized gear manufacturers like a
changeable part.
We can use this part in solid works “tool box” as a standard part (as they don’t have this at
present).
FINAL PRODUCT WILL LIIK LIKE THE FIG BELOW
I think we can use this method for all parametric parts
Thank you
Regards
Viinayak

12 | P a g e 4 S e p t e m b e r 2 0 1 4
If product and concept is liked by companies or by www.solidworks.com I will be the happiest
person.
I will quote price money of 20000 $ for my small work. And method.
We can add flanges and bores to gear.
I will be happy to become a designer for any industry who requires this kind of work as I don’t
have permanent job. I work at home
Thanking you again

13 | P a g e 4 S e p t e m b e r 2 0 1 4
For this work I have taken formulaes from “WESTERMANN TABLE” FOR METAL
TRADE,REVISED SECOND EDITION.PAGE NO 70 ,112 AND 142
I THANK SOLIDWORKS SOFTAWARE GROUP
I THANK WESTERMANN TABLE BOOK
AND I THANK YOU FOR YOUR PRECIOUS TIME
Thanking you
Your’s faithfully
Vinayak.B.Gudadari

Method

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