Message 1 of 1
A variable pitch helix is often used in product design, especially in [url=app:ds:mechanical]mech[/url]anical products . In ZW3D, designers can easily create various helixes by using the Equation Curve feature.
Here are some existing equations that are used to create helical curves. Firstly, let’s see the simplest helix with constant radius and constant pitch.
The table below shows the general expression, two different methods.
|Cylindrical coordinates||Cartesian coordinates|
r(t) = Radius
theta(t) = 360*Num_turns*t
z(t) = Num_turns*Pitch*t
x(t) = Radius*sin(360*Num_turns*t)
y(t) = Radius*cos(360*Num_turns*t)
z(t) = Num_turns*Pitch*t
For example, Radius=3; Num_turns=5; Pitch=2;
To make the variable radius, just replace Radius with Radius*t.
To make the variable pitch, just replace Pitch with Pitch*t.
Take a look at other spiral curves. (R mans radius; P means pitch)
|Spiral curve (constant R, variable P)||
|Spiral curve (variable R, constant
|Spiral curve (variable R,
In real design, some spiral curves are irregular, meaning designers couldn’t directly use these existing equation curves. Don’t worry! You can now modify the equation to get your required spiral curves.
Firstly,Let’see if it is possible to use a general expression to cover all of the above cases.
When R2 and P2 are both 0, this sprial curve is a general spiral helix curve. If R1 and P1 are both 0 , this is a variable radius & variable pitch spiral curve.
So by using this general expression, designers can work more productively!
For example, there is a spiral curve with constant radius (50mm),variable pitch (from 20 to 60mm) and length of 200mm.
According to these given conditions and the general expression, we get the following equations:
The result of variables:
So the expression of this spiral curve is：
r(t) = 50
thera(t) = 360 * 5 * t
z(t) = 5* 15* t + 5* 25 * t * t
ZW3D provides many different equation curves, including several different types of spiral curve. Comprehensively understanding the meaning of each parameter, designers are able to use the equation to create their desired curves.
- skp to dwg
- how to create fillet in autocad
- 2d convert to 3d free drawing software download
- where does autocad save to on windows 7
- how to open dwg on ipad
- how to convert autocad bak file to dwg
- dgn to dwg converter online
- using cad to work out area of a shape
- how to find area in autocad
- autocad how to change bak file to dwg
- cad mechanical download
- free cad download
- dwg to skp
- zwcad 2009
- cad cam software download