Answers.Body: <p>The XL motor runs at approximately 220 RPM.  Therefore, the following gearbox from the <a href="https://www.clear.rice.edu/elec201/Book/legos.html" rel="nofollow noreferrer">ELEC 201 class LEGO Design module from Rice</a> should be sufficient:</p>
  
  <p><img src="https://i.sstatic.net/Ud1fF.gif" alt="LEGO 243:1 Gearbox"></p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-10-21T19:00:04.110Z
Answers.LastActivityDate: 2014-10-21T19:00:04.110Z
Answers.UserDisplayName: Nick2253
Answers.Body: <p>You can use a worm gear for a compact, high ratio gearbox. By putting a worm gear on the motor shaft and using it to drive a 24 tooth gear you can achieve a 24:1 reduction.</p>
  
  <p><img src="https://i.sstatic.net/YlsSN.jpg" alt="For example"></p>
  
  <p>For high torque applications you could use multiple parallel axles held together by gears or wheel hubs.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-10-22T18:18:32.073Z
Answers.Text: Sadly, a 24:1 doesn't resolve my problem. Maybe i can add some other gear using worm gear as the input.
Answers.UserDisplayName: Imlach
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-10-22T18:43:27.920Z
Answers.Text: Then by using two of these assemblies you can achieve 576:1 reduction. Or if that is too much, you can get another gear either before or after this setup for an additional 2:1 or 3:1 reduction.
Answers.UserDisplayName: zovits
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-10-22T12:11:53.063Z
Answers.LastActivityDate: 2014-10-22T14:00:15.637Z
Answers.LastEditDate: 2014-10-22T14:00:15.637Z
Answers.UserDisplayName: zovits
Body: <p>I'm looking for the best way to gear down a Power Function XL.</p>
  
  <p>I need to achieve a very slow output RPM (less than 1-2 RPM). I've tried a 625:1 gear (trough 40:8 gear). Can someone link to a well done gearbox like that? Moreover, how I can make an axle more resistant at high torque (I've tried with brick round 2x2).</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-10-21T18:50:13.943Z
Comments.Text: Do you mean less than 1-2 RPM?  As written, you're indicating greater than 1-2 RPM.
Comments.UserDisplayName: Nick2253
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-10-21T19:10:11.833Z
Comments.Text: Yeah, I mean <1-2RPM (or around).
Comments.UserDisplayName: Imlach
Tags: <building><power-functions><gears>
Title: Gearing down a PF XL
UserDisplayName: Imlach
ThreadText: # Gearing down a PF XL
  
  (Asked by: username_0 on 2014-10-21)
  
  I'm looking for the best way to gear down a Power Function XL.
  
  I need to achieve a very slow output RPM (less than 1-2 RPM). I've tried a 625:1 gear (trough 40:8 gear). Can someone link to a well done gearbox like that? Moreover, how I can make an axle more resistant at high torque (I've tried with brick round 2x2).
  
  **Tags:** building, power-functions, gears
  
  > **Comments:**
  > **username_1**: Do you mean less than 1-2 RPM?  As written, you're indicating greater than 1-2 RPM.  
  > **username_0**: Yeah, I mean <1-2RPM (or around).  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_1 on 2014-10-21. Score: 4
  
  The XL motor runs at approximately 220 RPM. Therefore, the following gearbox from the [ELEC 201 class LEGO Design module from Rice](https://www.clear.rice.edu/elec201/Book/legos.html) should be sufficient:
  
  ![LEGO 243:1 Gearbox](https://i.sstatic.net/Ud1fF.gif)
  
  
  ---
  
  ### Answer by username_2 on 2014-10-22. Score: 2
  
  You can use a worm gear for a compact, high ratio gearbox. By putting a worm gear on the motor shaft and using it to drive a 24 tooth gear you can achieve a 24:1 reduction.
  
  ![For example](https://i.sstatic.net/YlsSN.jpg)
  
  For high torque applications you could use multiple parallel axles held together by gears or wheel hubs.
  
  > **Comments:**
  > **username_0**: Sadly, a 24:1 doesn't resolve my problem. Maybe i can add some other gear using worm gear as the input.  
  > **username_2**: Then by using two of these assemblies you can achieve 576:1 reduction. Or if that is too much, you can get another gear either before or after this setup for an additional 2:1 or 3:1 reduction.  
  
  ---
  
  