Grinding Roots - Advanced Manufacturing
Aug 22, 2013· Grinding of turbine blade fir-tree root-forms improves at aerospace supplier JJ Churchill. Until the middle of 2010, first-tier subcontract machinist, JJ Churchill, could produce turbine blades only if they had their fir-tree root-forms preground elsewhere, or if they were subsequently added by another subcontractor. No longer is this the case.