NASCAR Automotive Technology Series: Chassis inspection

NASCAR Automotive Technology Series: Chassis inspection


hey Courtney Hansen here with the latest on NASCAR automotive technology every car is built on a skeleton and steel bars and rails known as the chassis it’s the foundation that the rest of cars built around but did you know that before team can add anything from the engine to the body the chassis has to go through a detailed inspection process this happens at NASCAR’s research and development center every chassis is required to be pre certified before it goes to the racetrack every brand new chassis after it’s built is required to come through this building and go through the pre certification process which is a combination of Roemer measurements with a CMM Roemer arm and material thickness measurements in which we measure the thickness of all of the steel on the car the roamer arm is a portable CMM which is stands for coordinate measuring machine and that measures the dimensions of the chassis the XYZ coordinates of the chassis X is the fore and aft direction Y is the side-to-side direction and Z is the height off the floor there’s certain parts of the car that have to meet specific dimensions and they all have tolerances there’s about 50 or so Romer measurements and then there’s over a hundred and fifty material thickness measurements we use in ultrasonic meter which just works like an ultrasound when you have a baby it just uses sound and it when you touch the steel it bounces back and gives you a reading so with the roamer armor by largest tolerances a quarter of an inch and our smallest tolerance is about the thickness of a dime about ninety thousand in the beginning a lot of people were scared of the process because the tolerances 1/4 inch is pretty large in most worlds but when you’re working on a vehicle with steel and welding parts together it’s actually a pretty small tolerance when a car passes certification we adhere 11 RFID tags throughout the entire chassis it’s a radio frequency identification tag we program the tag so when you scan it with the scanner it retrieves the serial number every chassis is unique and has its own unique serial number and then we can then retrieve any measurements so we place the 11 RFID tags throughout the chassis and parts of the chassis that a team would typically want to change for some kind of competitive advantage so this is a deterrent to the teams doing that so once it is pretty certified then the teams go take it back to the shop and they put the bodies on and they get it ready to go to the racetrack and then once it’s at the racetrack they’ll go through to some template inspections and they inspect other various components of the car that we don’t see during the pre certification process Jimmie Johnson scores the win after the race we bring the winner in a random car back from every racetrack and we do the entire pre certification process all over again we inspect about 30 to 40 cars a week and a typical week we will reject between 3 & 5 cars when we reject a car we explain to the team what exactly was wrong we never tell the team how to fix a car we just tell them what is wrong and then they’re allowed to then take the car back to their shop and then they return try again the holes pre-certification is so that everyone’s on the even playing field before the cars make it to the track before they even begin to look like cars NASCAR makes sure that the teams are playing by the rules and keep playing by the rules all the way through the checkered flag for more on NASCAR automotive technology keep it here at NASCAR calm


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