Jul 9, 2008

Super Car

Hello All,

I am going to make a series of blog posts about a LEGO NXT car that I am building. This is the first of several. As the car progresses I will blog about its progresses.


The car has several requirements:

rear wheel drive

front and rear double wishbone suspensions

front wheel steering

2 gear transmission

“cool” looking

FAST


At Brickworld, I purchased two Ferrari F1 racer sets. These sets has a lot of really great car parts. The extra wide tires and suspension links are ideal for making a super car. In fact, a motorized F1 set would work really well. It is very will built, and has room for motors and maybe a well placed NXT. But I want to do more than just motorize an already built set. I want to build something from the ground up that can achieve higher performance.

For power I plan on using 4 Extra Large Power Function motors (XL PF). The XL PF motor has lots of torque. It is also easy to integrate into a design because of the placement of the Technic holes. To control the motors, I will use a HiTechnic, www.hitechnic.com, infrared link. The infrared link allows the NXT to control the Power Function infrared receiver, which intern will controls the motors.

4 PF XL motors will produce a lot of torque, and this toque needs to be managed properly. For this, I will need to install a transmission. This will allow the car to shift when the motors reach their maximum RPM, and maintain acceleration. I designed a transmission for this purpose. You can download the Lego Digital Designer file from my website: http://www.rose-hulman.edu/~KINZIEJH/lego/. Click the link “High Torque 2 Gear Transmission” to download the file.

More To follow soon!


-Jay Kinzie

8 comments:

Brian Whippo said...
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Dave Parker said...

Before you design the whole car for 4 XL motors, you might want to run some simple experiments with 2 XL motors vs. 4 XL motors. Depending on what kind of batteries you are using, given that the 6 AA batteries in the NXT can only put out so much current at a time, 2 XL motors may already max out the batteries under high load, so 4 XL motors might not help (but just add extra weight).

As an example experiment, design a simple frame for the NXT, motors, and simple wheels (without regard for how it looks), gear up the motors for speed, then try timing the thing in a drag race or top speed run using just 2 motors then 4 motors. Try different gear ratios to find out what the best you can do in each configuration is. Let us know what you find out if you try this!

Brian Whippo said...
This comment has been removed by the author.
Dave Parker said...

Right, I actually meant to say NXT or PF battery box. The PF battery box also has only 6 AA batteries, so there is a similar issue there. Maybe 2 battery boxes??! Plus the NXT, that is a lot of weight... It will be interesting to see what you guys come up with!

Steve said...

I'll be interested to see what exactly these will do. Assuming it goes FAST, where will it go? Directly into a wall?

At best, you may be able to get it to go FAST for about 3 seconds, before running out of space and hitting a wall.

While I love the idea of making an NXT controlled Super Car, simply making it a remote-controlled car seems like a waste.

Steve

Brian Whippo said...
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louiskart said...
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