THE DAILY GRIND: Family-owned Tracey Gear machines parts for clients ranging from Disney to NASA

(Editor’s note: This is the 11th installment in a monthly series highlighting some of the region’s ­unsung manufacturers that make products essential to the economy and, in many cases, our way of life. See previous installments here.) Doug Tracey’s company churns out thousands of meticulously crafted gears, shafts, splines and sprockets each year, but don’t ask