Answers.Body: <p>The picture you have does show a <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=57518#T=C" rel="nofollow noreferrer">57518 thread link</a>, which is what you wanted to use.  For that, you can use the 1/2 and 3/4 pins to attach a liftarm.  A <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=32316" rel="nofollow noreferrer">1x5 liftarm</a> would match the width of the 57518 thread.  What's shown in the picture is a <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=32524" rel="nofollow noreferrer">1x7 liftarm</a> which allows the module to lift more balls.</p>
  <p>For the pins, you should use the <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=32002" rel="nofollow noreferrer">3/4 pins part 32002</a> to be perfectly legal, but some might also use the <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=4274" rel="nofollow noreferrer">1/2 pins part 4274</a> to add friction to the connection.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-03-25T14:38:58.403Z
Answers.Text: Thanks for the reply, it helped a lot! Do you just "know" this or is there some place to check which parts are compatible? Because we are planning on adding [3743](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3743#T=C) gear racks, but I have no idea which gears will actually fit them.
Answers.UserDisplayName: Dries
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-03-26T15:37:06.783Z
Answers.Text: Those gear racks, and most gear racks that Lego has, are compatible with the modern regular gears with small teeth.  You can drive a sprocket with one such gear (like [3649](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3649)) via an axle, like [this](https://imgur.com/a/Ww58M0l).
Answers.UserDisplayName: Pinwheel
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-05-16T02:58:59.863Z
Answers.Text: Update in early 2022 LEGO released a friction version of half pins, is canot spin freely for strong and stable connections to my models
Answers.UserDisplayName: LKBricks
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-03-12T18:51:25.417Z
Answers.LastActivityDate: 2021-03-13T07:04:02.753Z
Answers.LastEditDate: 2021-03-13T07:04:02.753Z
Answers.UserDisplayName: Pinwheel
Body: <p>For a school project I'm trying to build a conveyor belt out of LEGO. I'm currently just working on the design so I haven't ordered anything yet. I think that for my build the <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=57518#T=C&amp;C=11" rel="nofollow noreferrer">57518</a> pieces are perfect. My question is pretty simple: is there a way to mount some sort of 'shelves' onto it? I'm completely new to LEGO (and not a native English speaker) so I can't explain it any better. The picture below from the <a href="https://www.greatballcontraption.com/" rel="nofollow noreferrer">GBC Homepage</a> shows exactly what I'm talking about:</p>
  <p><img src="https://i.sstatic.net/tN7t7.jpg" alt="Snippet of picture on GBC Homepage][2]" /></p>
  <p>I believe that the pieces used in the picture are <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=3873#T=C" rel="nofollow noreferrer">3873</a> (not sure). I can also see that in each of these light grey horizontal 'bars' there are two vertical rods that mount it on the conveyor belt itself. The 3873 pieces are not useful for me because they have too many openings.</p>
  <p>I spent long times browsing <a href="http://www.bricklink.com" rel="nofollow noreferrer">Bricklink</a> trying to find fitting pieces but I just don't know where to look. It would be great if somebody could provide me with links or numbers of the pieces that I need.</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-03-12T14:38:15.157Z
Comments.Text: no, those aren't the threads in that picture. look at it [up close](https://i.sstatic.net/tN7t7.jpg), it's the 57518 threads! thus you can easliy add those black pins and connect beams to it!
Comments.UserDisplayName: mindstormsboi
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-03-12T20:05:51.633Z
Comments.Text: For GBC instructions you may want to check [Rebrickable](https://rebrickable.com/mocs/?q=gbc)
Comments.UserDisplayName: Alex
Tags: <part-identification><gbc>
Title: Mounting 'shelves' on a 57518 Lego conveyor belt
UserDisplayName: Dries
ThreadText: # Mounting 'shelves' on a 57518 Lego conveyor belt
  
  (Asked by: username_0 on 2021-03-12)
  
  For a school project I'm trying to build a conveyor belt out of LEGO. I'm currently just working on the design so I haven't ordered anything yet. I think that for my build the [57518](https://www.bricklink.com/v2/catalog/catalogitem.page?P=57518#T=C&C=11) pieces are perfect. My question is pretty simple: is there a way to mount some sort of 'shelves' onto it? I'm completely new to LEGO (and not a native English speaker) so I can't explain it any better. The picture below from the [GBC Homepage](https://www.greatballcontraption.com/) shows exactly what I'm talking about:
  
  ![Snippet of picture on GBC Homepage][2]](https://i.sstatic.net/tN7t7.jpg)
  
  I believe that the pieces used in the picture are [3873](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3873#T=C) (not sure). I can also see that in each of these light grey horizontal 'bars' there are two vertical rods that mount it on the conveyor belt itself. The 3873 pieces are not useful for me because they have too many openings.
  
  I spent long times browsing [Bricklink](http://www.bricklink.com) trying to find fitting pieces but I just don't know where to look. It would be great if somebody could provide me with links or numbers of the pieces that I need.
  
  **Tags:** part-identification, gbc
  
  > **Comments:**
  > **username_1**: no, those aren't the threads in that picture. look at it [up close](https://i.sstatic.net/tN7t7.jpg), it's the 57518 threads! thus you can easliy add those black pins and connect beams to it!  
  > **username_2**: For GBC instructions you may want to check [Rebrickable](https://rebrickable.com/mocs/?q=gbc)  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_3 on 2021-03-12. Score: 7 | Accepted answer
  
  The picture you have does show a [57518 thread link](https://www.bricklink.com/v2/catalog/catalogitem.page?P=57518#T=C), which is what you wanted to use. For that, you can use the 1/2 and 3/4 pins to attach a liftarm. A [1x5 liftarm](https://www.bricklink.com/v2/catalog/catalogitem.page?P=32316) would match the width of the 57518 thread. What's shown in the picture is a [1x7 liftarm](https://www.bricklink.com/v2/catalog/catalogitem.page?P=32524) which allows the module to lift more balls.
  
  For the pins, you should use the [3/4 pins part 32002](https://www.bricklink.com/v2/catalog/catalogitem.page?P=32002) to be perfectly legal, but some might also use the [1/2 pins part 4274](https://www.bricklink.com/v2/catalog/catalogitem.page?P=4274) to add friction to the connection.
  
  > **Comments:**
  > **username_0**: Thanks for the reply, it helped a lot! Do you just "know" this or is there some place to check which parts are compatible? Because we are planning on adding [3743](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3743#T=C) gear racks, but I have no idea which gears will actually fit them.  
  > **username_3**: Those gear racks, and most gear racks that Lego has, are compatible with the modern regular gears with small teeth.  You can drive a sprocket with one such gear (like [3649](https://www.bricklink.com/v2/catalog/catalogitem.page?P=3649)) via an axle, like [this](https://imgur.com/a/Ww58M0l).  
  > **username_4**: Update in early 2022 LEGO released a friction version of half pins, is canot spin freely for strong and stable connections to my models  
  
  ---
  
  