Machinists at Boeing have voted to go on strike, another setback for the giant aircraft maker whose reputation and finances have been battered and now faces a shutdown in production of its best-selling airline planes. The International Association of Machinists and Aerospace Workers says 94.6% of voting workers rejected the contract, which would have raised pay 25% over four years, and 96% approved the strike, easily surpassing a two-thirds requirement. The strike by 33,000 machinists was set to begin at one minute after midnight Pacific Time Friday morning. (3 a.m. EDT/0700GMT) Boeing says it is ready to return to the negotiating table and reach an agreement.