Thin grooving knife is met sometimes in cutting process deflection, extend from fixed arbor place when them especially longer when more such. To eliminate this kind of error, the article introduced to use appropriative arbor bushing and grooving knife bearing. Thin grooving knife is met sometimes in cutting process deflection, extend from fixed arbor place when them especially longer when more such. To eliminate this kind of error, with appropriative arbor bushing and grooving knife bearing. Appropriative arbor bushing takes whorl, more largish than common bushing. The grooving knife bearing of two webbing whorl can make arbor bushing comes back to enter and carry close grooving knife on the head. Grooving knife first after feed, exit grooving knife bearing, make they stay on bracket, the each edge of bracket has adhesive plaster a few rounds to protect lever and the bearing that take whorl. When beginning to process a work, bearing bushing farewell goes carrying close grooving knife on the head. CNC MillingCNC Machining