This is a minimalistic gear design application. As such, its designs are made following the metric module DIN standard series. Regardless, it is made for everyone, no matter your amount of knowledge or if you have an engineering background. It includes 11 different types of gears (7 standards, 2 non-standard and 2 experimental) for every project you might want to implement them in:

  1. Spur Gear.
  2. Simple/Double Helical Gear.
  3. 90° Bevel Gears.
  4. Gear Rack.
  5. Worm Gear Drive (helical and straight hobbed face).
  6. Standard Internal Spur Gear.
  7. Non-Standard Internal Spur Gear (tooth profile is inverted; it’s better for less trimming interference).
  8. Standard Internal Helical Gear.
  9. Non-Standard Internal Helical Gear (tooth profile is inverted; it’s better for less trimming interference).
  10. Profile Shifted Spur Gear (Experimental method).
  11. Profile Shifted Helical Gear (Experimental method).


The two types considered non-standard were included for 3D printing since these designs of internal gears have proven to be practical when tight tolerances are a liability. Nonetheless, these designs are as useful as others.


The two variants considered experimental are the ones that use profile shifting. Profile shifting is a manufacturing method for gears that are needed to fit a larger/smaller mesh space while remaining with the same specs (number of teeth, module, pressure angle, etc.). If you’re planning to fabricate these gears using our designs, you have to consider they won’t reflect the “under cut” condition (for more information, visit KHK Profile Shifting). This design method is still in development and should not be relied on for accurate visualization or industrial level designing.

About This Version

Version 1.0.0, 9/13/2021
Initial release

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Customer Reviews

15 reviews
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  • Thank you very much for this gem
    Claudio Ciseria | November 08, 2021 Verified Download (What's this?)

    Thank you very much for your gear generator. Used it to design a gear for my motorized slider project and it work fawlessy.

  • Radial Method missing but great tool in every other way!
    Ewan Rothenwänder | November 07, 2021 Verified Download (What's this?)

    Very good program for creating all the gears necessary, if you only need the normal method instead of the radial method for helical gears!

    Juan Gras (Publisher) | November 08, 2021

    Hello, I've made the gear as you said (m=2.3mm | z=24 | ha = 14deg) and found that it´s accurately designed. I've put time in reviewing the code and re-researching the gear theory on Shigley´s Mechanichal Engineering Desing and the DIN metric standard for gears and couldn't find anything that points out as to why it would be badly designed.I´ve sent to your email a PowerPoint that has all the math performed by the program and the images that represent it. Hopefully this will be of use for you.

    Juan Gras (Publisher) | November 10, 2021

    For anyone reading this, as it turns out the GFGG designs helical gears following a stepped method as shown in https://khkgears.net/new/helical_gears.html , this type of gear retains the same dimmensions as the spur gear. However Ewan pointed out that there's another set of equations for helical gears as shown in https://khkgears.net/new/gear_knowledge/gear_technical_reference/calculation_gear_dimensions.html This doesn't mean the helical gears are wrong or don't work, they're just designed differently from what you may find in other apps. Currently the development of the GFGG is on hold in favor of a better design app, in that one we'll make support for both methods. Thanks.

  • Great stuff
    Adrian Medić | September 29, 2021 Verified Download (What's this?)

    Great plugin

  • Awesome
    Konrad Glura | May 28, 2021 Verified Download (What's this?)

    Thank you so much!

  • Awesome
    Lê Hải Đăng | May 13, 2021 Verified Download (What's this?)


  • Great except the dialog on closing Fusion
    Julien Krivacsy | April 08, 2021 Verified Download (What's this?)

    The add-on works great but there is an alert or confirmation dialog that got forgotten when you quit Fusion that is quite annoying, if you could disable it, this would be perfect!

    LudwigW Wall | May 03, 2021

    True, luckily it is easy to remove. In Tools / Scripts and add-ins / Add-ins - find and select the plug-in, select Edit and wait for the code editor to start. In the GFGearGenerator.py file, scroll all the way down and find the line ui.messageBox('Stop addin') and delete the line. This has no adverse side effects. Save the file, and enjoy not seeing the message again.

  • Gear Centers
    Jason Sulzberger | April 07, 2021 Verified Download (What's this?)

    It would be nice if the gears were placed at there correct centers.  I created a Rack with M=1 and a Spur with T=17 and M=1.  The pitch of the gear (17) should line up with h/2 of the rack tooth to mesh correctly.  However, the teeth clash.  Is there any info on how you are caluclating the centers?

    Thanks to the quick response the problem was solved, this is a assume tool. 

    Juan Gras (Publisher) | April 07, 2021

    Yeah the thing is that you´re using the wrong equation to line them up. I don´t know if your h/2 refers to the tooth height or the rack height so I´m going to tackle them both; if "h" refers to the rack´s height it's simple common math knowledge that if you change that height your equation will simply not work. If "h" refers to the tooth height, then no, "h/2" is not the right equation to use. You see the distance between the "pitch line" of the tooth and the tip is equal to the module (in your case 1mm) and the distance between the "pitch line" of the tooth and the bottom is 1.25*module. I´ve sent to your email a nice picture of a diagram. Now that we've set those things straight, the application does the parts for you according to the DIN metric standard, it does not handle the assembly of parts for you in that regard you must have the knowledge needed. The second thing you have to keep in mind is that F360 doesn´t support equation driven curves, so most probably you will have a little interference (that´s part of not using a software that has equation driven curves: precision) however it shouldnt be enough to "clash" as you said in your email. If you have any doubts or my explanation doesn't convince you, I can send you a drawing I made to to design the racks, if you want a reference then page 2149 of the Machinery´s Handbook 30th edition should be more than enough to illustrate. Please keep in mind this is a project I did in my spare time, so it will take time for me to implement assembly features.

  • Нужный инструмент
    Виктор Хмельников | February 27, 2021 Verified Download (What's this?)

    Приветствую, не могу установить установку в программе, скачивается файл неизвестный и не видит его, помогите очень срочно сделать программу

    Juan Gras (Publisher) | March 05, 2021

    Hi, please send an email to gfsolucionesintegradas@gmail.com so we can send you the files and the instructions ! Also, our response time is faster there.

  • Pretty good!
    David Ward | December 10, 2020 Verified Download (What's this?)

    It's pretty good, does what it says on the tin. One issue I have is I can't use a module of 0.75, is it easy to add more to the drop down list? Or perhap make it so I can set it manualy? Very good though!

    Nils Twelker | March 02, 2021

    It is fairly easy though you have to edit the plugin. Go to the addon page where you can enable/disable the GFGearGenerator. Select it. Stop it. Then click on edit. In line 7 of the code should be a list of all possible modules. Just add yours and you're good to go. Start the plugin again and you now can select whatever module you like.

  • Does what it says on the tin
    William Thomas | November 20, 2020 Verified Download (What's this?)

    Easy, simple interface. Doesn't make everything possible,  but a lot more than I'd be able to do without it.

    Good work!

  • Causes Stop dialog when trying to shutdown
    David Manning | November 17, 2020 Verified Download (What's this?)

    I have noticed that this app won't let Fusion 360 shutdown without having to click a dialog to stop the add-in. 
    While not a show stopper it's really anoying. 
    Appart from that, I'm still getting used to it but looks great. 

  • Useful tool
    manticoretango manticoretango | July 28, 2020 Verified Download (What's this?)

    If anyone has issues getting the worm screw to line up nicely with the corresponding gear, the distance is: (module)*4.254mm and the offset is (module)*0.4mm.

    It would be handy if the generator did this automatically, but it's a nice free tool regardless.

  • GGG (good gear generator)
    Gaspar Igor | July 26, 2020 Verified Download (What's this?)

    Tested with worm gears, it works. Thx.

  • Super
    Ozan Mutlu | July 13, 2020 Verified Download (What's this?)

    Nice work!

  • It makes gears
    Nathan Lutz | July 03, 2020 Verified Download (What's this?)

    I've played around with it a bit and it seems to work well.

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