The Reaper 4 x 4

[Doc_Brown]

Thanks timslegos, 750ACE and OleBM for the nice comments!

Nice performance in the video. I was hoping the motors would be faster though.

tim

I will be trying different gear ratios, 2:1 and 1:1. I'll see what happens,

[Boxerlego]

Nice work on the swapping the springs. Did you use ant tools to take the shocks apart or did you unwrap the springs off the shocks. Overall the crawler looks great and very tough.

[pluto7443]

Could you explain in detail how you connected the NXT motors? I have an NXT and would love to be able to use those motors with my PF battery box and IR

[z3_2drive]

Absolutely perfect. In fact, I love this so much I'll try and rebuild something similar to this if you don't mind I'm eager to see how it performs with my battery. Good thing I already have the adapter cables!

[Someonenamedjon]

Could you explain in detail how you connected the NXT motors? I have an NXT and would love to be able to use those motors with my PF battery box and IR

You would require this product, which is quite expensive, about $20 on bricklink. (lego doesn't sell it anymore)

He also stated this in the description:

The chassis utilizes NXT motors geared down 3:1, and one servo for steering the front wheels only. The NXT motors are connected using adapters that allow connection to regular PF elements.

[Doc_Brown]

Absolutely perfect. In fact, I love this so much I'll try and rebuild something similar to this if you don't mind I'm eager to see how it performs with my battery. Good thing I already have the adapter cables!

No man go for it! It has so much potential! What I came up with was just a weeks worth, i'm sure it can be refined and improved heaps. I'm wondering if it is possible to gear down again 2:1 then 3:1.

You would require this product, which is quite expensive, about $20 on bricklink. (lego doesn't sell it anymore)

He also stated this in the description:

Thanks Jon! Yes quite pricey, I totally forgot about the ones I ordered ages ago with my NXT set, SOOO clad I got them at the time!

Could you explain in detail how you connected the NXT motors? I have an NXT and would love to be able to use those motors with my PF battery box and IR

Its pretty simple, the adapter cable that Jon linked connects to the NXT motor via the phone line type connection then at the end it can be connected to a PF short cable and then that connects to the IR unit.

Thanks for the nice comments guys!

Edited May 24, 2013 by Doc_Brown

[Hopey]

Any chance of a link to where you got those tyres for $5 ea? They seem to be several times that wherever I can find them online...

[Someonenamedjon]

I saw some that were $5 a pair, look on page...i thunk 8 of the 3rd party tires post.

[Doc_Brown]

Any chance of a link to where you got those tyres for $5 ea? They seem to be several times that wherever I can find them online...

Here you go.

http://www.ebay.com.au/itm/160838773023?var=460088207523&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

Excellent seller, it doesn't say but these are Annsmans 1.9" as you will see in my pics.

I think these will become the "standard" Lego Technic 3rd Party tires!!!!

[Someonenamedjon]

Question: do your batteries run out fast, as the nxt motors require lots of power...

[Doc_Brown]

Good question Jon, umm no actually, all the testing was done on fresh batteries, everything in the video x3 and still going strong so about 1 hour run time so far.

Will let you know when they die! haha and the approx time of life.

Also I found I can virtually stall the motors and they do not suffer from the "over heating" safety switch in the battery box, unlike 2 XL that would "cut out" if you know what I mean.

[Someonenamedjon]

On the nxt when i had ran 3 motors ( one was a custom electromagnet) it wore out almost instantly

[Doc_Brown]

Hahahah, nice! Was that using the nxt block? And how did you make a custom Electromagnet????

[Someonenamedjon]

Hahahah, nice! Was that using the nxt block? And how did you make a custom Electromagnet????

It was for my Robofest exhibition project, I just wrapped a lot of copper coiling around a big bolt. You can see the video here (state competition)

My team won first and the explanation is the last part of the video

I also just used a motor block and a relay, increasing the power because my nxt did not have enough power

[Doc_Brown]

WOW Sweet! , Wish we did cool things like that when I was at school!

Great job, well done for winning.

And which one is you? haha

[Someonenamedjon]

I am on the team Metal Robots, in the video i was the last person to speak. You cannot really see the electromagnetic robot because of the stupid camera man!

[z3_2drive]

I've built it! Since I couldnt see exactly how you built your axles I improvised, and of course I also built a different chassis, here's a video:

] change quality to hd (720p) for better resolution Edited May 26, 2013 by z3_2drive

[Doc_Brown]

Sweet man! looking really good! It's great isn't it? So simple yet powerful!

How many volts are you running?

Thanks for building it and mentioning me! :thumbup:

[z3_2drive]

Sweet man! looking really good! It's great isn't it? So simple yet powerful!

How many volts are you running?

Thanks for building it and mentioning me! :thumbup:

Yeah! I might just let this survive in one piece for a while! It runs at about 10 volts the rear axle stalls on hard climbs but like you mentioned it doesnt heat up! one other thing is the lego battery I think weighs more, so yours has more weight on the front for climbs

[Doc_Brown]

Yeah! I might just let this survive in one piece for a while! It runs at about 10 volts the rear axle stalls on hard climbs but like you mentioned it doesnt heat up! one other thing is the lego battery I think weighs more, so yours has more weight on the front for climbs

Hahah, yep thats why I put it there! I built the frame around the battery box so it would be in the best place just like the real thing.

10 volts nice! Good job.