Determine density and resistance of carbon samples.
What does a Furnace Stock Inspector do?
Determines density and resistance of carbon samples which have been graphitized and inspects graphitized stock after removal from furnace: Marks samples of green stock before graphitization to indicate their position in furnace. Receives samples from FURNACE UNLOADER before remaining charge is unloaded. Cleans samples with scraper and steel wool and weighs them. Measures samples in several places with diameter rule to obtain average diameter. Places samples on resistance-testing device, sets meter to allow specified number of amperes to pass through sample, and records readings from millivoltmeter. Calculates average density and average resistance from weight, average diameter, and millivolt reading, using slide rule and formula. When furnace is unloaded, marks pieces with resistance grade number of samples. Inspects cleaned stock for pits, cracks, burrs, and bends. Determines extent of damage from cracks and imperfections, and marks salvageable pieces for cutting to next largest possible size. Directs workers to remove inspected pieces.