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MIT Motorsports - This article is part of a series.
Part 1: This Article

Introduction #

MIT Motorsports builds a formula-one-style racecar every year to compete in FSAE. One of the big goals for MIT Motorsports this year is moving to four-wheel drive. We developed our own custom gearbox and inverter. To get the power and efficiency curves of the Hawk40 motor in combination with our custom inverter and gearbox, four new members and I are building a dynamometer.


I learned how to use NX, an industrial software that is powerful but unintuitive. Here’s a screenshot of the motor mounts I CADed:

Dyno CAD

Waterjet #

We used the waterjet to cut the plates out of 1/8" steel.

Waterjet Plates

Welding #

Then I learned how to weld. Welding is kind of like soldering, but if you accidentally let the tip touch metal, it gets stuck and you can end up with something like this:

Welding Fail

I added my name to the welding plate but as you can see I messed up the E. It’s supposed to look like dimes stacked on each other.

Welding Name

Here’s the jig we used to ensure that the mounting plate is square. This is very important because we need the two dyno motors to be as close to concentric as possible. After we had the plates secured, we welded tacks on the inside to connect the parts before doing the larger welds.

Dyno Jig

After practicing welding for a few days I was confident enough to weld the mounting plates together.


Dyno Mount

I also made for the Hawk40, which is the motor we will use for the front wheels.

Hawk40 Mount

Torque Sensor #

My pathetic attempt to exert torque on the wireless torque sensor:

Torque Sensor

We haven’t been able to run the dyno yet because of electrical roadblocks, but we should have it running sometime in March.

MIT Motorsports - This article is part of a series.
Part 1: This Article