The KASINICS (Korea Astronomy and Space science Institute Near Infrared Camera System) is a ground-based near-infrared (NIR) imaging instrument. KASINICS has offner relay optics to reduce unwanted infrared light. For the offner optics, we adopted an ultra precision machining process which is installed at KBSI (Korea Basics Science research Institute). Since the offner relay optics is made of aluminum 6061 metal material, we did several tests to reach the specification. We found that a 0.497mm radius nose bite and 220m/min machining speed are best tool and condition to make this offner optics with the precision machine. In this paper, we report the technical method of ultra precision machining and results of the KASINICS offner optics.

• 김건희(한국기초과학지원연구원) | GEON HEE KIM (Korea Basic Science Institute (KBSI))
• 진호(한국천문연구원) | HO JIN (Korea Astronomy and Space Science Institute (KASI))
• 양순철(한국기초과학지원연구원) | SUN CHOL YANG (Korea Basic Science Institute (KBSI))
• 김명상(한국기초과학지원연구원) | MYUNG SANG KIM (Korea Basic Science Institute (KBSI))
• 국명호(한국기초과학지원연구원) | MYUNGHO KOOK (Korea Basic Science Institute (KBSI))
• 이성호(한국천문연구원) | SUNGHO LEE (Korea Astronomy and Space Science Institute (KASI))
• 육인수(한국천문연구원) | IN-SOO YUK (Korea Astronomy and Space Science Institute (KASI))