The strike at Boeing by 33,000 members of the International Association of Machinists union, which reaches its seventh day today, has already cost the company and workers $572 million, according to an estimate from Anderson Economic Group.

A labor strike at Boeing showed no signs of ending Friday, as the walkout by 33,000 union machinists entered its eighth day and the company started rolling furloughs of nonunion employees to conserve

Around Boeing Co.’s vast aircraft manufacturing hub in Seattle, the great belt tightening has begun as the planemaker and its factory workers settle in for a labor dispute that will test the resolve of both sides.