ton-force to form the body panels; the upper section applies 1400 tonnes of downward force and the lower section 130 tonnes. The blank aluminium sheet is stretched over the lower draw die and openings are cut with robots transferring the panels between processes. The workers then inspect each panel to ensure correct pressing. The parts are then stacked in frames and stored. The machines press one part every 6 seconds and create 5,000 parts per day. Drive unit installation The car is raised and the drive unit is installed into the rear axle assembly. The drive unit provides power directly to the wheels without a drive shaft. Battery pack installation The battery pack weighs almost and is delivered to the installation area and is raised into the car using a lift. Placing the battery pack under the cabin floor adds strength and rigidity to the car and lowers the vehicle's center of gravity to . A titanium plate is installed under the battery pack which protects it in the event of a high-speed collision and to protect from road debris. Safety incidents In November 2013 there was an accident when the low-pressure aluminum casting press failed, spilling molten metal on three workers and causing their clothing to catch fire. Tesla was fined 89,000 by the California Division of Occupational Safety and Health for seven safety violations, six considered serious. On April 1, 2019, Tesla reached a settlement with the United States Environmental Protection Agency (EPA) over its mishandling of hazardous waste in 2017. Tesla allowed hazardous waste to accumulate on site without a permit beyond the allowed 90 days; the EPA found Tesla failed to "promptly clean up flammable paint and or solvent mixtures", left two containers of hazardous waste open with "no gasket or locking mechanism", and violated air emission standards for three leaky transmission lines that the waste moved through. See also List of Tesla factories Tesla Gigafactories: Gigafactory Berlin-Brandenburg Gigafactory Nevada Gigafactory New York Gigafactory Shanghai Gigafactory Texas References External links The Tesla Factory: Birthplace of the Model S Tesla Motors photo tour Stamping, body, paint, automated motor production, assembly, factory upgrade (official Tesla) How Tesla Builds Electric Cars, A 3-part documentary on the Tesla Factory from Wired magazine "Brand New Tesla Factory", National Geographic video; by National Geographic Channel Megafactories NPR's This American Life's full hour story of the creation and demise of NUMMI – episode