Ring gear template generator generator#
Ring gear template generator code#
Ring gear template generator download#

For this, we have to generate a helix: helix = doc.addObject('Part::Helix',name+'_helix') The easiest would be a straight extrude, but we may want helical gears instead. Now, if we want a 3D gear that we can use, we need to extrude it. The sun and planet gears are external gears, the ring gear is an internal gear.

We can also specify if we want an external or internal gear. This will generate a 2D profile with the desired number of teeth, modulus and involute tooth profile according to the pressure angle specified. To generate the actual gear profile, we can rely on FreeCADs involute gear generator: involute = InvoluteGearFeature.makeInvoluteGear(name+'_involute') And of course the height, or thickness, of the gears. There are a few key parameters to planetary gears: The number of teeth for the sun gear Ts, the planetary gears Tp, and the ring gear Tr, or at least two out of three, the remaining one can be calculated with the formula:ДЇurther, we need to know the modulus of the gears (the pitch, or gear tooth size), the tooth profile, and the helix angle for helical gears. I set out to write a script that can auto-generate arbitrary planetary gear sets, with helical gears if desired. Planetary gear sets are very versatile, useful and compact, but maybe a little less intuitive to construct than regular gear trains. Some times it may contain references to the file name of the CAD document вЂ“ this is not a good idea, as it wonвЂ™t work in other documents.

Ring gear template generator code#

I like to clean up the recorded code a bit. To add additional commands to a Macro scripts, a good way is to carry out the action in the CAD window, and copy-paste the python commands from the console to the script. I find this a good way to get started with a script вЂ“ record a few actions, look a the python code to learn how it works, and then edit and refine the code. More interestingly, you can also click вЂњEditвЂ¦вЂќ, and a window with the python code will open. If you now open the dialog under вЂњMacro -> MacrosвЂ¦вЂќ, you can see a list of all your recorded Macros. When you are done, select вЂњMacro -> Stop Macro RecordingвЂќ. To to the menu вЂњMacro -> Macro RecordingвЂ¦вЂќ, give it a name and start to record. If you want to repeat a number of actions to re-use again later, you can simply record them as a Macro. You can view these commands by activating they python console (View -> Panels -> python console).ДЄnother really cool feature is the Macro Recorder. For this post, I am using FreeCAD-daily build, version 0.18.Д®very command done through the FreeCAD GUI is actually translated to a python command which actually carries out the action. It is still in development, and has some way to go before it will be competing with commercial tools, but for some simple designs it is quite usable, and actually quite powerful when it comes to scripting. It is the ratio of the reference diameter of the gear divided by the number of teeth.In this post, we will write a python script for FreeCAD that generates planetary gear assemblies.ДЇreeCAD is an open-source parametric 3D CAD program. 'Module' is the unit of size that indicates how big or small a gear is. Gears in SVG are measured in pixels, which is the value multiplied with the scale (Pixel per Unit) as it is displayed on the right side.

Ring gear template generator generator#

Spur Gear Generator is unitless: you may choose inches, cm or millimeters when importing your DXF file as you will have the same value for D/P as it is set above or as imported (SI or imperial nits).

Ring gear template generator download#

Spur Gear Calculator and Generator - Download DXF, SVG or CSV Excel format files Related Resources: calculators Spur Gear Calculator and Generator Download DXF, SVG or CSV Excel format files