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Gear Ratio Calculator updated

October 16th, 2015 Leave a comment Go to comments

My gear ratio calculator has been updated.

My Gear Ratio Calculator has been updated to 2.2 version with the following list of fixes and changes:

  • all icons and images of gears and motors have been changed (you’ll need to clear your browser’s cache to see the change)
  • drop-down lists of gears and motors are now wider to accommodate more items
  • added 16t gear with clutch on both sides, small Technic turntable, new 2015 large Technic turntable and worm gear with stops at both ends
  • added PF L, PF E, EV3 M and EV3 L motors
  • type 2 differential now uses separate images for the 16-teeth side and for 24-teeth side
  • added planetary gear ratio calculator

Gear Ratio Calculator 2.2 »

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  1. victor
    September 7th, 2016 at 11:39 | #1

    Thank you.

  2. Sariel
    September 7th, 2016 at 11:12 | #2

    Practically, none. They work exactly the same.

  3. victor
    September 7th, 2016 at 11:09 | #3

    did u know what is the difference between this two gear:



    one is inner tap open, another one is inner tap closed.

    thank you for your reply.

  4. Sariel
    January 15th, 2016 at 14:44 | #4

    I think two PF XL motors are powerful, a single L motor won’t change much. If two XL motors use a gearbox and still have problems with your car then either it’s very heavy or there’s something wrong.

  5. Thomas
    January 15th, 2016 at 13:39 | #5

    Hi Sariel
    thank you for your work. I am building a supercar, powered by two xl motors. now it seems to be too weak. My idea is, to use an adder by an L-Motor. Because of available space, I want to build the adder after a 5+R Gearbox. According to your book, the gear ratio of motor (incoming from gearbox) and the adder should be same. This wont be possible (swiching gears). You think, it is still usefull to build it?
    Thank you!
    greetings Thomas

  6. Sariel
    December 21st, 2015 at 23:04 | #6

    I guess somebody could make a smartphone app out of it, for example, but I don’t know how myself. This is the best I can provide and I’ve kept it online for a few years already.

  7. December 21st, 2015 at 22:26 | #7

    Would it be possible to make an off line version available ? This tool is so handy, but I’m afraid it will be off line one day.

  8. Sariel
    October 19th, 2015 at 00:36 | #8

    Fixed both problems, thank you.

  9. October 18th, 2015 at 21:48 | #9

    I like the update, but there appear to be a few bugs. When you try to clear the (newer) 56-tooth turntable, the image of the turntable does not go away (But the ratio is adjusted accordingly). The problem seems to be unique to that piece.
    Also, when calculating two or more pairs of gears, when you change one of the gears in the first pair the final ratio does not update correctly – it will only show the ratio of the first pair and ignore all later pairs.

  10. Boston Abrams
    October 18th, 2015 at 17:15 | #10


  11. Sariel
    October 17th, 2015 at 22:54 | #11

    @Boston Abrams
    Sure, I’ll do it.

  12. Boston Abrams
    October 17th, 2015 at 22:04 | #12

    Can you add ev3 motors. ( :

  13. Sariel
    October 17th, 2015 at 13:38 | #13

    First, do you realize that all the high-performance pneumatic Lego engines you see online rely on heavily modified pieces? Like cut valves and drilled cylinders?

    Dzięki, raczej każde zagadnienie rozgryzałem praktycznie. O ile wiem nie ma jednej strony która pokazuje to wszystko w przystępny sposób, chociaż niezłe są How Stuff Works i http://www.mekanizmalar.com/

  14. TechnoFan
    October 17th, 2015 at 12:49 | #14

    Currently I am planning to make a pneumatic engine any tips that you can offer me. Also do you have any tips to prevent cluster of pneumatic pipes which end up blocking the turnables and other elements.

  15. Psor
    October 17th, 2015 at 12:45 | #15

    Właśnie jestem na etapie 11. rozdziału Twojej książki i muszę przyznać, że jestem bardzo pozytywnie zaskoczony, bo piszesz o rzeczach, na które nigdy nie zwracało się uwagi. Gdzie się tego wszystkiego dowiedziałeś, mam na myśli działanie wielokrążków i subtraktora, bo nigdzie nie mogę tego znaleźć, a wikipedia formuje wszystko w postaci wzorów, których nie ma jak ugryźć. Znasz jakieś ciekawe książki lub linki, gdzieby to można znaleźć?

  16. Sariel
    October 17th, 2015 at 11:52 | #16

    What kind of help do you need exactly?

  17. TechnoFan
    October 17th, 2015 at 10:40 | #17

    Brother, Thanks a lot for this gear ratio calculator thank you very much .Now I can build my gearboxes with ease. Do you know from where I can get help on pneumatics.

  18. Sariel
    October 16th, 2015 at 15:32 | #18

    Glad I can help 🙂

  19. October 16th, 2015 at 15:29 | #19

    Thank you for this helpful update! I teach a class that uses LEGO Mindstorms to introduce basic concepts in mechanical engineering, and my students frequently refer to your calculator for planning out their robots’ gear ratios. I think that they will be very excited with the new features.

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