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Pull-back rat
When Roxie first joined our family about 2 months ago, we thought she was mostly a rat terrier. So I made her a rat.
About this creation
Please feel free to look over the images and skip the verbiage.

Being the manly bro that I am, I can't just go around posting cute dog videos on YouTube. Heck, I don't even say "cute".



Nosiree! But a guy can't be held responsible for posting LEGOŽ videos with dogs who happen to be considered cute in some circles.



All I can say is, good thing that rat's made of LEGOŽ!

On this page:


Overview

I had a ton of #1 and #2 Technic panels left over from another project and was determined to use them up on the rat.



Looks more like an armadillo from the front if you ask me.









While at it with Roxie, I taught the rat to roll over, too.



The 6x5x3 pull-back motor (12787c01) sitting right in front of the tail is TLG's latest and most powerful. It's an excellent power source.

The pull-back motor has more than enough torque to spin most LEGOŽ wheels on hard flooring. These small ZR wheels offered the best combination of rear-wheel traction and rotation rate. The latter sets the limb rhythm.





So what's wrong with this picture?



Yep, it's a dog's tail -- too high and too short.



Lowering the tail was a snap, but I need more of those bricks with hinges to lengthen it.

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Rat specifications

Mass:0.369 kg
Overall dimensions:366x160x120 mm (LxWxH)
Platform:Rear-wheel drive (4x2x0)
Propulsion:Pull-back motor (12787c01)
Steering:None
Power supply:Spring tension
Construction:Mostly studless
Modified LEGOŽ parts:None
Non-LEGOŽ parts:None
Credits:Original MOC
See also:[]





Roxie's specifications

Mass:7.7 kg
Overall dimensions:Too wiggly to measure
Platform:4x4x4
Propulsion:Full-time all-paw drive
Steering:All 4 paws
Power supply:Kibble
Modified LEGOŽ parts:None
Non-LEGOŽ parts:100%
Credits:Doggie-style reproduction



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Comments

 I made it 
  July 7, 2016
Quoting Topsy Creatori Fun toy! And Roxie... is... cute! :)
Thanks, Topsy! I'll tell her you said so.
 I like it 
  July 7, 2016
Fun toy! And Roxie... is... cute! :)
 I made it 
  June 20, 2016
Quoting Stephan Niehoff Really cool Jeremy
Many thanks, Stephan!
  June 20, 2016
Really cool Jeremy
 I made it 
  June 19, 2016
Quoting Henrik Jensen Even though your pull-back rat is quite amazing, I think Roxie is telling you: Don`t play with that stupid rat, play with me! Nice post Jeremy, always entertaining to see what`s going on!
Thanks, Henrik! You're probably right, but she does seem to enjoy the rat now and then.
 I made it 
  June 19, 2016
Quoting Nick Barrett The rat's great fun, Roxie is gorgeous!
Thanks, Nick!
 I like it 
  June 19, 2016
The rat's great fun, Roxie is gorgeous!
 I made it 
  June 18, 2016
Quoting Oran Cruzen Well, well, well, what do we have here? Jeremy, oh come on, a yellow rat? Just kidding! Nice little rat you have there. How many of Roxie teeth marks are on it? LOL I am glad you are now providing the specifications for Roxie since she has a major part in this rat race!
Thanks, Oran! The tail has a few bite marks, but so far, the ears have been spared.
 I like it 
  June 18, 2016
Well, well, well, what do we have here? Jeremy, oh come on, a yellow rat? Just kidding! Nice little rat you have there. How many of Roxie teeth marks are on it? LOL I am glad you are now providing the specifications for Roxie since she has a major part in this rat race!
 I like it 
  June 17, 2016
Even though your pull-back rat is quite amazing, I think Roxie is telling you: Don`t play with that stupid rat, play with me! Nice post Jeremy, always entertaining to see what`s going on!
 I like it 
  June 16, 2016
Thanks! IDK, It might be a homeschool thing. :)
 I made it 
  June 15, 2016
Quoting jds 7777 Yes, electronic music (or EDM, as it is now called [Electronic Dance Music]) has a tendency to get stuck in your head. As a high-schooler, I can tell you its quite popular right now. I have a friend who is a DJ and he played (or is it "DJ"ed? I don't know) for us for about 2 hours once. Considering the size of the speaker he had, I'll leave to imagine the condition of our hearing for the rest of the night. :)
Thanks, JDS -- now I have the lingo. At one point, I thought that this EDM track might resonate somehow with the way Roxie thinks, but there's not enough chaos. BTW, you write pretty darned well for a high-schooler.
 I like it 
  June 15, 2016
Yes, electronic music (or EDM, as it is now called [Electronic Dance Music]) has a tendency to get stuck in your head. As a high-schooler, I can tell you its quite popular right now. I have a friend who is a DJ and he played (or is it "DJ"ed? I don't know) for us for about 2 hours once. Considering the size of the speaker he had, I'll leave to imagine the condition of our hearing for the rest of the night. :)
 I made it 
  June 15, 2016
Quoting jds 7777 Forgot to mention; That music though! I really wasn't expecting that based on your previous videos! :)
Thanks, JDS! Searched the YouTube audio database on "mouse" and filtered for clips that would end at about the right time. That piece of electronica popped up, and I couldn't get it out of my head.
 I made it 
  June 15, 2016
Quoting gene 3S Nice idea! Great anticipation by your dog.
Thanks, Gene! At 9 months, her enthusiasm still has a life of its own.
 I like it 
  June 15, 2016
Forgot to mention; That music though! I really wasn't expecting that based on your previous videos! :)
 I made it 
  June 15, 2016
Quoting jds 7777 Here's the link to the Bricklink catalog: http://www.bricklink.com/v2/catalog/catalogitem.page?P=61100c01#T=C
Thanks, that's the one! I'll test it next.
  June 15, 2016
 I like it 
  June 15, 2016
Nice idea! Great anticipation by your dog.
 I like it 
  June 15, 2016
Haha, you have no option as to do so and I've expected nothing else but this... ;) Tomorrow I've to show this video my youngest boy, so much fun! And what about a "Rat Pack" on wheels...? There would be some nice background music for... Greets, my friend!
 I made it 
  June 15, 2016
Quoting jds 7777 Ha Ha! Very nice, Jeremy! I used that motor to power a 4wd car with one motor (RWD is more effective). Lego makes an even better wind-up motor in my opinion, though. The grey brick based one with the orange push-button. You wind it up, then push the orange button to release the energy. The benefit of this is you can store energy in it. However, if you stack some bricks in front of the button, it functions like a normal wind-up motor. Why is this a better motor? Because it has a nearly flat torque curve through its whole spin time. It spins quite slowly compared to the new style wind-up motors, but it is super easy to gear it up for more speed. Torque is actually really good. (I'd slat it a little below the current motors) When geared up it can a small pile of Legos into an unlikely speed demon with great speed, range, and torque. The gearing can even be adjusted for micro-scale crawlers and the like.
Thanks, JDS! That motor sounds like a winner. I may even have one waiting to be tested. What's the number, just to be sure? The ability to store and release elastic energy without having to supply an external mechanical control system is pretty appealing. Pull-backs have certainly changed over the years, in both performance and form factor. I'm just starting to explore them.
 I made it 
  June 15, 2016
Quoting Lo var Lachland That is awesome. 5/5
Many thanks, Lo var!
 I made it 
  June 15, 2016
Quoting Oliver Becker Hahaha, wonderful stuff, Jeremy! Pulling my cheeks and lips apart to a BIG smile! This one should get the "BHM" this month! (Best Humorously MOC)! Btw.: Roxies expression could melt the Arctic, beware to walk her there because of climate protection! ;)
Too kind, my friend, but OMG! You mean that my dog could be driving global warming all by her tiny self?! OMG, OMG, this is the worst news ever! OMG, what'll we do, what ever shall we do?? Well, just for starters, we're keepin' the dog.
 I made it 
  June 15, 2016
Quoting Geology Joe A great mixture of technical jargon and humor and always! Very entertaining, and excellent model. I especially enjoyed the specifications of the Canis lupus familiaris!
Thanks, Joe! As you can see, the rat doesn't stand a chance, but we still have fun. The dog is a force of nature in a deceptively small package.
 I like it 
  June 15, 2016
Ha Ha! Very nice, Jeremy! I used that motor to power a 4wd car with one motor (RWD is more effective). Lego makes an even better wind-up motor in my opinion, though. The grey brick based one with the orange push-button. You wind it up, then push the orange button to release the energy. The benefit of this is you can store energy in it. However, if you stack some bricks in front of the button, it functions like a normal wind-up motor. Why is this a better motor? Because it has a nearly flat torque curve through its whole spin time. It spins quite slowly compared to the new style wind-up motors, but it is super easy to gear it up for more speed. Torque is actually really good. (I'd slat it a little below the current motors) When geared up it can a small pile of Legos into an unlikely speed demon with great speed, range, and torque. The gearing can even be adjusted for micro-scale crawlers and the like.
 I like it 
  June 15, 2016
That is awesome. 5/5
 I like it 
  June 15, 2016
Hahaha, wonderful stuff, Jeremy! Pulling my cheeks and lips apart to a BIG smile! This one should get the "BHM" this month! (Best Humorously MOC)! Btw.: Roxies expression could melt the Arctic, beware to walk her there because of climate protection! ;)
 I like it 
  June 15, 2016
A great mixture of technical jargon and humor and always! Very entertaining, and excellent model. I especially enjoyed the specifications of the Canis lupus familiaris!
 I made it 
  June 15, 2016
Quoting David Roberts I bought a couple of sets with the pull-back motors (heavily discounted end of lines!) in the hope of making some clockwork toys. I was hoping to go battery free. Unfortunately I found that they were very hard to wind up, unless they were attached to wheels. Any sort of gear train definitely didn't help. They also produce high revs and low torque for a short time and then they're spent. Great for pull back cars but that's it. A disappointment really. Excellent to see that somebody has found a creative way to use these motors. Nicely done.
Thanks, David! Couldn't agree more: The pull-back motor has its frustrations, and they've beaten me into submission. I now think of building with the pull-back as like trying to find a good use for F# in the key of C major: The odds aren't promising, but good uses exist, and some can really pay. (Jazz manages to find a lot of good uses for F# in C, as you know.) I'm surprised to hear that you're disappointed with the torque. I see plenty of torque there -- sometimes more than the structure or traction of an MOC can handle. Unfortunately, that torque comes at the expense of being hard to wind. I'm also resigned to the pain of building with the RC Race Buggy motor, but that one really does have some torque issues with a nasty electrical twist.
 I like it 
  June 15, 2016
I bought a couple of sets with the pull-back motors (heavily discounted end of lines!) in the hope of making some clockwork toys. I was hoping to go battery free. Unfortunately I found that they were very hard to wind up, unless they were attached to wheels. Any sort of gear train definitely didn't help. They also produce high revs and low torque for a short time and then they're spent. Great for pull back cars but that's it. A disappointment really. Excellent to see that somebody has found a creative way to use these motors. Nicely done.
 I made it 
  June 15, 2016
Quoting Gabor Pauler I hope Jeremy, that no Lego bricks were harmed by this mighty extraterrastrial, alien-lowrider, plastic-eating monster!
I can neither confirm nor deny brick carnage, Gabor, but I will point out that rat terriers were not bred to play nicely with rats.
 I made it 
  June 15, 2016
Quoting Walter Lee I enjoyed the very cute dog video.
Rats! You saw right through my macho smokescreen.
 I like it 
  June 15, 2016
I hope Jeremy, that no Lego bricks were harmed by this mighty extraterrastrial, alien-lowrider, plastic-eating monster!
 I like it 
  June 15, 2016
I enjoyed the very cute dog video.
 
By Jeremy McCreary
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