givemelightbike wrote:
我那顆CH-95里程...(恕刪)
多謝大大的詳細解答，貌似American classical也是清豪代工么，看著有異曲同工的地方。
怨念聚合體 wrote:
銃牙銃面與否，跟BB安裝後的角度是無關的
會影響BB角度的因素只有一個，攻牙時的角度
非也，五通的攻牙銑面工具分成左右兩半的用意就是確保兩側的軸承基準面是平行的，否則用銼刀就可以去除五通面的烤漆，不需要動用昂貴又少用的雞絲頭。
Park BTS-1攻牙銑面工具的用法是兩顆絲攻要同時旋入五通，因為兩側的刀柄是套在一起，所以可維持攻牙的同心度，並不是靠五通原本的螺紋來引導。兩顆絲攻完全轉入五通後才開始銑面，銑刀必須在刀柄和絲攻的引導下才可以切削出平行的五通面。
純銑面用的工具如Campagnolo 725(下圖)，要先裝兩顆tool guide在五通裡面(兩顆guide中間還有套筒相連，所以可維持同心度)，以便引導銑刀切出同樣角度的平面。
以下引述自Park Tool:(http://www.parktool.com/blog/repair-help/bottom-bracket-tapping-and-facing-bts-bfs)
"....Additionally, some bearing system benefit from having the faces of the shell square to improve bearing adjustment and bearing longevity. If the shell faces are deformed, and are not parallel to one another, the left and right bearing may not be concentric to one another. Machining the shell face improves concentricity."
以下是Barnett's Manual 4th edition chapter3 的部份內容:
以下摘錄自Bike Race Info
"The fixed cup and lock rings have flanges that lock up against the sides of the shell. If the sides of the shell are uneven instead of machined smooth, there isn't enough contact surface area to get the cup to lock on and stay in place. Sometimes, cups that chronically loosen in use will stay tight after facing the bottom bracket shell. Also, there is a little bit of clearance in the threads of the cups and the bottom bracket shell. If you screw a cup into the shell part way, you can wiggle the cup a little because of the space between the threads of the cup and the threads of the shell. If the shell sides aren't parallel to each other and perpendicular to the threads axis, the cups can actually be tipped a little off center as the cup's flange contacts the shell's misaligned side. When this happens, it is impossible to get the bearings to run true. Bottom brackets with spindles that get tight and loose as the spindle turns may have this problem. This is exactly like the cheap headset problem discussed in facing the head tube."
(這篇關於frame prep的文章非常棒，可惜很少有車店在組車時這麼厚工講究的
)真的非常講究的話，裝外露式頭碗的車架，頭管也要銑面和鉸孔。不過現在的車架越來越容易組，例如隱藏式頭碗、壓入式BB等規格都不需要額外處理，似乎只要會鎖螺絲就可以組車了吧...
zg0435 wrote:
多謝大大的詳細解答，貌似American classical也是清豪代工么，看著有異曲同工的地方。
兩者的構造幾乎一樣，至於AC有沒有找清豪代工，或是清豪向AC買專利，這我就不清楚了。
AC的傳動側軸承是用c形環固定，可以從bb cup中拆下，但清豪CH-95的傳動側軸承是用襯套從內側夾住，可能要破壞襯套才能取出軸承，是比較可惜的一點。
以下擷圖自AC ISIS BB的拆解說明書:
上一頁補充CH-95的分解圖:
http://www.mobile01.com/topicdetail.php?f=316&t=3424161&p=62#53258591
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