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mechanical fixtures tooling Episode 7

Tham khảo tài liệu 'mechanical fixtures tooling episode 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 760-763 764 763 769- f 770 B - It A Keeps machining from turning c Tightened by wrench c 5p f ring r ECCENTRIC This is a simplified collet in that split ring c acts as a collet. Link A enables the eccentric not only to damp the col Collet Internal Collet Internal 1 if Chucks take many forms. Actuated by gears cams springs drawbars or racks and pinions they clamp internally as well as externally. JThe jaws move horizontally on the incline or may swing out of the way. 772 3 JAWS 3 POSITIONERS 771 Chuck Chuck The three positioners are out of phase with the three jaws by 60 . The two narrow surfaces A of jaw B move along pin C to reduce friction JU4 773 spring J actuates M which ỈS fastened to sieeve bi to force N down jfifereby roTating to a vertical position via Sink o one of thẹ three fingers K that pre-position the part. The other fingers are similarly rotated. After the part Is-placed upon the three fingers the clamping operation begins. When B is pulled down expander c spreads the three equalized jaws A. As c is pulled down by 8 it in turn via Belleville washer springs 0 forces expander H to spread the three equalized jaws G. After the six jaws have clamped the part N is forced up. bl via the three links o rotates the three pre-positioning fingers K outward horizontally leaving the underside of the part free to be machined. Note how the six jaws are retracted. Also note that the screw that holds in place bases E of the retracting springs for jaws G also serves as a set screw for expander c. In the unclamping operation sleeve p strikes expander H raises it and via spring D raises c allowing the six jaws to retract. Chuck J 774 774 When D is raised the twelve pins c raise squeezer B which causes - the six jaws A to clamp the part. Six springs retract the jaws. TO CLAMP The six springs on the smaller of the two circles are offset relative to the twelve springs on the farger circle. The eighteen springs force piston Di down and it via cap screws Ẹ pulls down A which