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Worm Gear Casings

Three types of custom casings for worm gear and gears of various size.

There is a special Lego casing for a worm gear, which is nice and strong, but also large and only useful with a 24-teeth gear. To broaden the number of gears which can be encased along with the worm gear, I have developed three simple custom casings for a 8-teeth gear, 24-teeth gear and finally 40-teeth gear.


24teeth.png 40teeth.png 8teeth.png
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  1. July 31st, 2014 at 04:31 | #1

    Hey Sariel. You build great stuff and have amazing ideas much more complex and cool than these, but I just wanted to thank you for posting these. Since you first posted them I’ve come back to this page time and time again and used one of these housings or a variation thereof in many creations or WIPs. Thanks!

  2. Neko
    December 24th, 2013 at 13:51 | #2

    it was typo, gear rack 🙂

  3. Sariel
    October 10th, 2013 at 13:16 | #3

    Well, what is a “great rack”?

  4. teh_obag
    October 10th, 2013 at 11:56 | #4

    why not? 🙁

  5. Sariel
    April 4th, 2013 at 08:11 | #5


  6. April 4th, 2013 at 03:21 | #6

    Hi, do you have a casing for a great rack + worm gear???

  7. Sariel
    December 11th, 2012 at 18:31 | #7

    @Jon Håvard
    No, you can use 32039 just as well.

  8. Jon Håvard
    December 11th, 2012 at 18:07 | #8

    Is there any reason for why you used part 32013 instead of part 32039 at the 40t?

  9. Sariel
    July 11th, 2012 at 19:51 | #9

    Of course it would.

  10. Nate
    July 11th, 2012 at 18:51 | #10

    Hi Sariel. I was wondering if using the 8 teeth gear would increase speed. Please reply.

  11. kicopt
    July 11th, 2012 at 13:57 | #11

    Thanks a lot for the worm casing, I’m using it to build a motorized fully automatic gun, using the power functions set.

  12. Nate
    July 10th, 2012 at 19:20 | #12

    The first casing gave me the perfect amont of torque for my technic truck. It is also more compact than Lego’s gear block

  13. legocarengineer
    February 21st, 2011 at 18:06 | #13

    These are nice ideas for the worm gear, i just needed a casing like first one.
    It helped me finishing my height-adjustable independent wheel suspension for my technic car.

    You are doing great work, keep on going!!! 😀

  14. mescalinum
    November 8th, 2010 at 00:38 | #14

    nice idea. thank you.

    also, is possible to use a similar arrangement for a gear rack winder.


    in this example I combined both, but in a slight variation – notice how I swifted up the axis one stud (by adding an extra 8 gear).
    it’s also possible to replace the 24 gear with two 8 gears, to achieve a lower profile

  15. May 28th, 2010 at 17:30 | #15

    I like the first one becuase it fits all of the gear sizes

  16. protect-it-and-more
    March 13th, 2010 at 00:48 | #16

    hmmmmmmmmmm…. you should use the things kind of like the ones shown, but with 2 stud long axles. red in a couple of sets….. for the 40 tooth gear. i hope i get a website. i’m protect-stuff-and-more on legomindstorms.com.

  17. February 20th, 2010 at 14:35 | #17

    Hi! Thanks for sharing you work and ideas with other Lego fans.

    Thanks for this idea because all the motorized parts of my 1st Trial Truck are based on it.



    Best Regards,


  18. Sariel
    October 3rd, 2009 at 08:48 | #18

    Well, I think you can reinforce it with liftarms. It is possible to build a stronger casing, but it would be much larger.

  19. RjbsNXT
    October 2nd, 2009 at 21:07 | #19

    ahh, i see what you mean

    so are there any stronger casings for 40t gears? – the one you’ve shown keeps wedging itself apart :/

  20. Sariel
    September 25th, 2009 at 17:53 | #20

    Nope, it won’t work with 40t gear. It’s too large to fit in.

  21. RjbsNXT
    September 25th, 2009 at 17:22 | #21

    you could infact use the first type shown for all of 8,24 and 40 tooth gears although i like the 3rd one aswell. good job 🙂

  22. Sariel
    September 21st, 2009 at 12:44 | #22

    Thank you. I use MLCad and LDraw. The last set I bought was 8297 some time ago, I focus almost exclusively on parts now.

  23. September 21st, 2009 at 12:38 | #23

    What program you use for those pictures?

    I allways wonder how you can imagine all these things… You are amazing builder. Do you buy sets or only bricks and motors and all those?

  24. legokid
    August 27th, 2009 at 18:21 | #24

    thanks your gear case has help me make prtotypse to motoris my hauler in drive.

  25. kama12811
    August 14th, 2009 at 17:42 | #25

    to jest świetne! ta zębatka i ten ślimak czyli to urządzenie(które mi się bardzo podoba) może podnieść ramie od żurawia samojezdnego (8421) i nie tylko!!! 1000000/10

  26. Sariel
    August 12th, 2009 at 14:19 | #26

    The problem is mainly that it takes months or even a year to develop a really good TrTr vehicle, and I don’t have the time. I’ve built 37 creations in 2008, would you be happy if I just built a single truck instead?

  27. Boris
    August 12th, 2009 at 12:21 | #27

    thxx, I love all of your projects and most of your ideas, but I really don’t get one thing, why don’t you join the truck trial or participate in one. I saw that you have already built three trucks, but don’t see what’s the problem.

  28. Sariel
    August 11th, 2009 at 14:30 | #28


  29. Boris
    August 11th, 2009 at 13:37 | #29

    Ahh, can you please tell me what animation program you used?
    Also this was really helpful.

  30. Sariel
    July 15th, 2009 at 22:20 | #30

    Read FAQ.

  31. crawlerdude
    July 15th, 2009 at 21:38 | #31

    where can i get worm gears? i looked on LEGO pick a brick but it didnt have any

  32. manne
    July 3rd, 2009 at 13:55 | #32

    Thanks, very useful in my snowcat.

  33. July 2nd, 2009 at 22:05 | #33

    Your little creations that you continue to create are what make your models a real thing of Beautiful Engineering.

  34. lg008823
    June 30th, 2009 at 12:17 | #34

    How true!

    This this is the Add-Sub I mentioned before, technic connectors being pushed apart by the load…


    PS: Great Truck on technicbricks!

  35. Sariel
    June 30th, 2009 at 11:55 | #35

    It looks interesting, but I think that it may come apart under a haevy load, just like the 40t gear casign I’ve shown here.

  36. lg008823
    June 30th, 2009 at 11:44 | #36


    Here´s the deep link


    I just noticed I did forget the 4x 3L axles to fix the whole thing together, good luck!

  37. Sariel
    June 30th, 2009 at 10:49 | #37

    The file you linked to is not yet public. Try adding a direct link.

  38. lg008823
    June 30th, 2009 at 10:46 | #38

    Well something like that should do the job:


  39. djtermoz
    June 29th, 2009 at 12:45 | #39

    Helpful, but those are the easiest casings to build (40z+worm, 24z+worm, 8z+worm). Try to add some ideas for 16z+worm. That would be really helpful.

  40. lg008823
    June 28th, 2009 at 20:48 | #40

    great aides! one remark to the casing with the 40-tooth gear. When the force on the wormgear gets too much, it might push the casing apart. The other two are held together with by liftarms.
    I experienced this when I build a pretty flat add/sub for the 8294, I used the same technique but unfortunately the forces pushed it apart

  41. legobuilder
    June 28th, 2009 at 13:50 | #41

    very helpful

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