Description: You better call Dr. Grant because we’ve got a T'Rex! If you thought our previous robot chassis were beefy and rugged then you haven’t seen this. The T'Rex Tank Chassis is a full metal all-terrain robot platform designed to handle the most extreme driving conditions possible! This chassis offers the best of two worlds: It takes almost no time to go from un-boxing to rolling chassis, but it’s also ready to be expanded on and makes great base stock for a serious ‘bot.
The T'Rex Tank Chassis is equipped with two independently driven 12V gearmotors with a typical current rating of 4A (No Load at 1.3A & Stall Current at 11A with a 5000mAh LiPo Battery). Each motor drives one tank tread that offers three lower wheels that help to improve traction and reduce shock to the main body and controller. On that note: the gears, tracks, suspension struts, and wheels are all made of die cast zinc which offers a fair amount of corrosion resistance reducing the constant need of maintenance and upkeep.
Inside the T'Rex Chassis' aluminum body you will find plenty of space for your motor controller, batteries, sensors, and anything else you could possibly need space for. Two top panels can be easily removed via four spring catches mounted in between the wheels. Additionally, the front hinged cover plate can be removed to affix any large sensor(s) to your T'Rex, you can even attach a custom plate to fit your preference (we’re waiting to see someone 3D Print a T-Rex head and attach it to one of these guys)! Since the chassis does have a full aluminum body it will block any electrical noise and radio signals so you will need to attach any receiver or transmitter to the outside of the T'Rex.
We highly recommend using the T'Rex Motor Controller (not included) with this chassis, you can find it listed in the related items below.
Dimensions: 355 x 175 x 130mm (14" x 6.8" x 5")
Weight: 3.7Kg (8 lbs)
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As a robotics platform, it’s everything you could need. Room enough for two 5000 3S LiPos, the T-Rex driver board, and maybe a Raspberry Pi. On top of all that, you can strap radios, cameras and the like to the top plate, so payload space is ample. The spring-loaded catches on the sides make accessibility a breeze, and because the access panels are split into two sections, you can just hinge open the front to change the batteries. Build quality feels good on the tracks and wheels, the suspension is a little floppy for my taste but that’s not a big issue, and the main chassis is made of solid, thick steel. However. And thats a big however. After you receive this, get rid of the worthless included gearboxes. (I’m currently waiting on the steel version of the same gearbox, see comments for details) When I got mine, I set all the electronics up and threw a half charged 2200mAh battery in it. By the time I had driven up and down the sidewalk twice, about 5 minutes of drive time, there was a wretched grinding sound coming from one of the gearboxes. By the time it limped back to base, 6 minutes after first power-on, the left tread was completely disabled - the bushings in the gearbox had worn down enough to bring the gears out of alignment and make movement impossible. This happened without a heavy payload or intense load on the treads - I was running the bare minimum weight needed to move the thing, and rolling down a smooth, flat sidewalk.
Long story short - it’s a great platform, especially for the price, but is crippled by a junk powertrain that will need replacing in the hour of operation, if you’re lucky.
I’m really sorry to hear you had issues with your gears. We have seen some other units with a similar issue. Please contact us for assistance. We’d like to help you out with this issue. https://www.sparkfun.com/returns