“The level of precision we are achieving is at the limits of modern manufacturing capability. The TMT team was particularly impressed with the Coherent team’s early efforts to mitigate risks using sub-scale models. ![]() High Precision Lab Small-Scale Glass Model - Early small-scale development model to demonstrate the edge sensor pocket and precision glass cutting - Image credit: Coherent, Inc. A new machining center will perform Hex Cut operations on a total number of 231 polished roundels manufactured by Coherent. For that reason, Coherent developed a production unit dedicated to TMT at the company's plant in Richmond, California. These features are used for bonding the glass segment with its mechanical support assembly.Įxtremely precise and specialized equipment is required to meet strict TMT technical requirements. These processes include cutting the roundel outer perimeter and pocketing the back side of the mirror segment with sensor pockets and central diaphragm cavity. The multi-step Hexing process involves a series of precision material removal operations, transforming a polished roundel into a hexagonal segment. ![]() TMT full-size Primary Mirror Segment Hexagonal cutting - Each TMT segment must be cut into a hexagonal shape and carved at critical dimensions for lodging high precision support components known as the central diaphragm and two edge sensors on each side - Image credit: Nanjing Institute of Astronomical Optics and Technology (NIAOT), National Astronomical Observatories.
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