This free application is compatible with Mac OS X 10.8 or later. The program relates to Design & Photo Tools. Our antivirus analysis shows that this Mac download is virus free. From the developer: Create 3D models of involute gears in accordance with DIN 867, for example for 3D printing. You can select the degree of tessellation, and export as. From the Apple menu in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it. Which macOS version is the latest?
UPDATE: This post refers to an old version. For information about version 2 see this post.
Before you read on, please make sure that you have seen part 1 which introduces my Online Involute Spur Gear Builder. This second part addresses DXF export and compares the generated tooth profiles with the output from a commonly used OpenScad script.
DXF Export
Unfortunately there are many variants of the DXF format and not every tool is capable of importing the dxf output generated by the tool. Here are a few pointers:
- Inkscape: Inkscape is a free, open source vector graphics tool that can import the generated dxf output without any issues. Inkscape's native format is svg but it also supports many other output formats that are useful when dealing with other tools.
- Illustrator and VectorWorks do not seem to recognize the generated output. Lael and Jeroen Donker reported workarounds (thank you, both!):
- Lael: Just an update for anyone else trying to use illustrator or having issues importing into drawing programs. I downloaded Dassault draftsight, opened the dxf generated by this generator, then saved it as 2009, 2010 and 2013 dxf. 2009 and 2010 opened fine in illustrator.
- Jeroen Donker: I found that the dxf output file can be opened in Inkscape (freeware on all platforms) and then saved in any vector format (I use eps) Opening the file in Adobe Illustrator is an easy next step.
Generated Output Comparison
It is interesting to compare the generated output with that of other tools. In particular this makes it quite easy to see when the undercuts become relevant. For the following I used Leemon Baird's featured Public Domain Involute Parameterized Gears for OpenScad. Upfront I want to clearly state that this comparison by no means is intended to diminish Leemon Baird's code. Like many other tools it simply does not cater for undercuts which in most real-world scenarios can be ignored. If undercuts are not an issue Leemon Baird's tool is a perfect choice.
For the comparison I chose a pressure angle of 20°, 8 mm circular pitch, no clearance, and no backlash. For reference here is the scad file with the configuration for the 6 tooth gear and the resulting dxf file generated by Leemon Baird's script.
The images below (excerpts from the svg file InvoluteGearComparison.svg) show the tooth profiles for tooth count 40, 20, 10, and 6. The thicker black background lines represent the output generated by Leemon Baird's code. The thinner red lines in the foreground are the tooth profiles generated by my online generator:
As expected the two profiles match almost exactly for large tooth counts. It is interesting to see that even for a tooth count of 20 there is a slight undercut visible. I expect in real live this would not matter since it is compensated for by a non-zero backlash.
The most common type of gear is the involute gear, which provides smooth and efficient operation. A gear is defined by the following parameters:
- Pitch diameter (diameter of gear)
- Diametral pitch (tooth size)
- Number of teeth
- Pressure angle (commonly 14.5, 20 or 25 degrees)
The pressure angle defines the shape of a tooth. For two gears to mesh the pressure angle and diametral pitch must be the same (i.e. the shape and size of the teeth must match). There is a simple relationship between pitch diameter, diametral pitch and number of teeth so when defining a gear we only need to specify two of those parameters.
The ability to create involute gears is included in python-based ADScript. Let's see how.
This script creates a new part called Input Gear and then adds a sketch to it on the XY-plane for the profile of a gear by calling AddGearNP. NP shows which two parameters are used, N = number of teeth and P = pitch diameter.
The 0, 0 defines the coordinates of the center of the gear. Crossing the borders mac os.
Once the gear has been created we can read out the diametral pitch:
Involute Mac Os Update
There are two other functions that we can call to create gears, depending on which two parameters we wish to use.
Here is an example script that shows how we can create two gears that can be used together to provide a 3:1 reduction ratio:
Involute Mac Os X
Once the gear has been created we can read out the diametral pitch:
Involute Mac Os Update
There are two other functions that we can call to create gears, depending on which two parameters we wish to use.
Here is an example script that shows how we can create two gears that can be used together to provide a 3:1 reduction ratio:
Involute Mac Os X
Cafes command mac os. And the result:
