The making of 30 in telescope - 13, #600 fine grinding over

自製天文望遠鏡 牛頓望遠鏡 杜蘇式 卡式 設計和磨鏡方法<br>
佛科試鏡法 佛科刀片儀 光柵試鏡法 光柵片
回覆文章
Chanlunlun
夸克星
文章: 3847
註冊時間: 週四 09 10月, 2003 21:06

The making of 30 in telescope - 13, #600 fine grinding over

文章 Chanlunlun » 週四 28 4月, 2005 00:01

Dear ATMs,

After 3 hours of continuous working we finished the #600 fine grinding today. Upon completion of the fine grinding the mirror surface was inspected thoroughly for pits and imperfections. This time no scars, sleeks or pits were observed. The mirror is just as smooth as silk surface.

Fine grinding a big mirror is to be carried out with extreme care for two reasons – in the first stage of fine grinding there will be no friction between the mirror and the tool. The mirror will slip out from the tool very easily and jeopardize to wreckage. Furthermore on prolong grinding when water start to evaporate the between mirror and tool glass surfaces tend to seize together. We have to remove the mirror in time otherwise it is extremely difficult to separate the seized glass disks again. Normally one 「wet」 will last for about 15 minutes, for #600 grit.

It is lovely to feel the silky smooth mirror surface after washing clean and dried. The mirror surface even start to reflect at shallow angle.

Best regards
Chan Yuk Lun
27-4-2005
附加檔案
30_21.jpg
After #600 fine grinding the mirror surface starts to reflect at shallow angle.
30_21.jpg (61.65 KiB) 已瀏覽 6407 次

回覆文章

回到「自製天文望遠鏡 Amateur Telescope Making 」

誰在線上

正在瀏覽這個版面的使用者:沒有註冊會員 和 5 位訪客