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Mastering SolidWorks Zeid 2014 - Spur Gears.pdf
Mastering SolidWorks - The Design Approach - Ibrahim Zeid - 2014 ed2.pdf

Solidworks 
Spur Gear involute parametric spline Equation driven curve in SolidWorks

start sketch, draw the center lines, 
circles in front view plane of tooth Addemdum (top), Pitch, Base, Root circles.
da = 127.236 mm Addendum circle
dp = 120.000 mm Pitch circle
db = 112.764 mm Base circle
do = 110.508 mm Root circle

Sketch 
- Spline
- Style Spline
+ Equation driven curve 

Existing Relations
+ Tangent
+ Coincident

Options -- For construction

Equation Type
- Explicit
+ Parametric 

Parameters
xt  -56.382*(sin(t)-t*cos(t))
yt  56.382*(cos(t)+t*sin(t))

Parameters
t1 = 0
t2 = 1   ( t2 = 0.54958038  after trim of spline by tooth top circle )


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Spur Gear from Mastering CAD CAM Zeid 2004.pdf
page 91 - 99

3.16 Tutorials
3.16.1 Create a Spur Gear

Modeling strategy : 
1. Create the tooth involute curve.
Using the Front sketch plane, create a spline curve through 
free points and enter the points shown in the table below, 
to generate the curve as shown

Involute curve whose points are shown in the table below (on left)

x		y		z
0		-50		0
0.011068	-50.19		0
0.08834		-50.7558	0
0.297012	-51.6842	0
0.700275	-52.954		0
1.358341	-54.5355	0
2.327502	-56.3912	0
3.659237	-58.4765	0
5.399372	-60.7397	0
7.587302	-63.1233	0
10.2553		-65.5644	0


da = 120.236 mm Addendum circle
dp = 120.000 mm Pitch circle
db = 112.764 mm Base circle
do = 110.508 mm Root circle
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