Answers.Body: <p>Here's a design I've been using, <a href="https://technabob.com/blog/2010/10/19/lego-metal-slug-tank/" rel="noreferrer">based on this model by Lambert Varias</a>:</p>
  
  <p><a href="https://i.sstatic.net/eVZcL.png" rel="noreferrer"><img src="https://i.sstatic.net/eVZcL.png" alt="enter image description here"></a></p>
  
  <p>It's not a perfect circle, but it is relatively small all things considered:</p>
  
  <p><a href="https://i.sstatic.net/LimjW.png" rel="noreferrer"><img src="https://i.sstatic.net/LimjW.png" alt="enter image description here"></a></p>
  
  <p>It's pretty simple, but here's a partial disassembled version to better show what goes into it:</p>
  
  <p><a href="https://i.sstatic.net/VEXPU.png" rel="noreferrer"><img src="https://i.sstatic.net/VEXPU.png" alt="enter image description here"></a></p>
  
  <p>Parts shown:</p>
  
  <ul>
  <li>1x <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=55013" rel="noreferrer">55013</a></li>
  <li>2x <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=4265c" rel="noreferrer">4265c</a></li>
  <li>2x <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=57585" rel="noreferrer">57585</a></li>
  <li>6x <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=32013" rel="noreferrer">32013</a></li>
  <li>6x <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=32556" rel="noreferrer">32556</a></li>
  <li>12x <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=42610" rel="noreferrer">42610</a></li>
  <li>12x <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=50945" rel="noreferrer">50945</a></li>
  </ul>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-12-12T07:20:24.623Z
Answers.LastActivityDate: 2018-12-12T07:20:24.623Z
Answers.UserDisplayName: Alexander O'Mara
Answers.Body: <p>Just stumbled across this little gem of a Lego omni wheel!</p>
  <p><a href="https://www.youtube.com/watch?v=7gIUFnRCFY4" rel="nofollow noreferrer"><img src="https://i.sstatic.net/8BL4t.jpg" alt="enter image description here" /></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-11-14T14:46:23.237Z
Answers.Text: Which is also by Isogawa Yoshihito, besides it being slightly more esthetic, I do not consider it an improvement on his previous design.
Answers.UserDisplayName: Michael Verschaeve
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-11-13T19:21:25.683Z
Answers.LastActivityDate: 2020-11-14T19:45:16.627Z
Answers.LastEditDate: 2020-11-14T19:45:16.627Z
Answers.UserDisplayName: Patrick Wood
Answers.Body: <p>I have copied a design by Isogawa Yoshihito</p>
  
  <p><a href="https://i.sstatic.net/Rsof8.jpg" rel="noreferrer"><img src="https://i.sstatic.net/Rsof8.jpg" alt="omni wheel"></a></p>
  
  <p>I prefer it over the Lambert Varias design as the wheels are positioned more radially</p>
  
  <p>More pictures in this EuroBricks thread:
  <a href="https://www.eurobricks.com/forum/index.php?/forums/topic/76297-isogawayoshihitos-lego-technic-omni-wheel-crab/" rel="noreferrer">https://www.eurobricks.com/forum/index.php?/forums/topic/76297-isogawayoshihitos-lego-technic-omni-wheel-crab/</a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-12-12T10:25:57.150Z
Answers.LastActivityDate: 2018-12-12T10:25:57.150Z
Answers.UserDisplayName: Michael Verschaeve
Body: <p>In robotics, rotacasters or omni wheels are often very useful.</p>
  
  <p>It's possible to buy LEGO-compatible ones from some third parties, here's one random example:</p>
  
  <p><a href="https://www.rotacaster.com.au/shop-product/robotic-wheels/rotacaster-35mm-double--35a--tpe-roller--abs-body--lego-or-vex-hub-adaptor" rel="noreferrer"><img src="https://i.sstatic.net/EFR9ns.png" alt="enter image description here"></a></p>
  
  <p>Unfortunately, LEGO has yet to make any themselves, which means if you are looking for a purist solution (because of robotics competition rules for example) you are out of luck.</p>
  
  <p>Or are you? It might be tough to make a small one, but surely it's possible to build one.</p>
  
  <p>What are some good rotacaster / omni wheel designs?</p>
  
Tags: <mindstorms><technic><building><design><robotic>
Title: What are some good purist rotacaster / omni wheel designs?
UserDisplayName: Alexander O'Mara
ThreadText: # What are some good purist rotacaster / omni wheel designs?
  
  (Asked by: username_0 on 2018-12-12)
  
  In robotics, rotacasters or omni wheels are often very useful.
  
  It's possible to buy LEGO-compatible ones from some third parties, here's one random example:
  
  [![enter image description here](https://i.sstatic.net/EFR9ns.png)](https://www.rotacaster.com.au/shop-product/robotic-wheels/rotacaster-35mm-double--35a--tpe-roller--abs-body--lego-or-vex-hub-adaptor)
  
  Unfortunately, LEGO has yet to make any themselves, which means if you are looking for a purist solution (because of robotics competition rules for example) you are out of luck.
  
  Or are you? It might be tough to make a small one, but surely it's possible to build one.
  
  What are some good rotacaster / omni wheel designs?
  
  **Tags:** mindstorms, technic, building, design, robotic
  
  ---
  
  ## 3 answers
  
  ### Answer by username_2 on 2018-12-12. Score: 8 | Accepted answer
  
  I have copied a design by Isogawa Yoshihito
  
  [![omni wheel](https://i.sstatic.net/Rsof8.jpg)](https://i.sstatic.net/Rsof8.jpg)
  
  I prefer it over the Lambert Varias design as the wheels are positioned more radially
  
  More pictures in this EuroBricks thread:
  <https://www.eurobricks.com/forum/index.php?/forums/topic/76297-isogawayoshihitos-lego-technic-omni-wheel-crab/>
  
  
  ---
  
  ### Answer by username_0 on 2018-12-12. Score: 9
  
  Here's a design I've been using, [based on this model by Lambert Varias](https://technabob.com/blog/2010/10/19/lego-metal-slug-tank/):
  
  [![enter image description here](https://i.sstatic.net/eVZcL.png)](https://i.sstatic.net/eVZcL.png)
  
  It's not a perfect circle, but it is relatively small all things considered:
  
  [![enter image description here](https://i.sstatic.net/LimjW.png)](https://i.sstatic.net/LimjW.png)
  
  It's pretty simple, but here's a partial disassembled version to better show what goes into it:
  
  [![enter image description here](https://i.sstatic.net/VEXPU.png)](https://i.sstatic.net/VEXPU.png)
  
  Parts shown:
  
  * 1x [55013](https://www.bricklink.com/v2/catalog/catalogitem.page?P=55013)
  * 2x [4265c](https://www.bricklink.com/v2/catalog/catalogitem.page?P=4265c)
  * 2x [57585](https://www.bricklink.com/v2/catalog/catalogitem.page?P=57585)
  * 6x [32013](https://www.bricklink.com/v2/catalog/catalogitem.page?P=32013)
  * 6x [32556](https://www.bricklink.com/v2/catalog/catalogitem.page?P=32556)
  * 12x [42610](https://www.bricklink.com/v2/catalog/catalogitem.page?P=42610)
  * 12x [50945](https://www.bricklink.com/v2/catalog/catalogitem.page?P=50945)
  
  
  ---
  
  ### Answer by username_1 on 2020-11-13. Score: 5
  
  Just stumbled across this little gem of a Lego omni wheel!
  
  [![enter image description here](https://i.sstatic.net/8BL4t.jpg)](https://www.youtube.com/watch?v=7gIUFnRCFY4)
  
  > **Comments:**
  > **username_2**: Which is also by Isogawa Yoshihito, besides it being slightly more esthetic, I do not consider it an improvement on his previous design.  
  
  ---
  
  