Fixturing

Clamp work-pieces for maximum rigidity Work-piece clamping and alignment are next to consider when setting up a machine for HPT. As the ability to accurately rotate the work-piece is vital for achieving close dimensional tolerances, work-piece clamping has an important role to play in machine set-up. Thin-walled components especially place very stringent requirements on clamping. Make sure that you employ wide clamping jaws – they offer many benefi ts compared to ordinary three-point jaws. Ordinary three-point jaws can distort the roundness of your work-piece due to local excessive clamping forces Wide jaws distribute clamping forces over a larger area for better HPT and narrower dimensional tolerances. Properly aligned headstock and tailstock promote rigidity. Some work-pieces tolerate clamping via the headstock only, but if they are long and slender, tailstock clamping is also required. As a guideline, a length-to-diameter ratio of up to 2:1 is normally acceptable for work-pieces supported on one end only. With additional tailstock support, this ratio can be extended. Aligning headstock and tailstock properly also promotes maximum rigidity and good conical point contact, both of which contribute to a firstclass finished product. Note that a thermally symmetric headstock and tailstock design will add extra dimensional stability.

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