鋁筒或碳纖筒

[Subaru]

請問大家有無渠道可以提供12"口徑的鋁筒或碳纖筒, 用作望遠鏡筒?

我相信國內應該有廠商做, 不過唔知邊道可以揾到.

[patlau2]

http://www.alibaba.com/product-gs/22164 ... _tube.html

I asked before and it seems they do 零售. But I am not sure if they have size for your need.

[BossKwan]

請問大家有無渠道可以提供12"口徑的鋁筒或碳纖筒, 用作望遠鏡筒?

我相信國內應該有廠商做, 不過唔知邊道可以揾到.

我都搵緊這方面資料。
依家磡反射大鏡比以前幸福，配件選擇多，又比以前平，可以大尋星鏡，雙速調焦座，就算自己唔磨鏡，買塊10至12吋既主鏡都好平，再加個2吋廣角目鏡，睇deep sky一流，真係不可同日而語......

[bingsze]

請問大家有無渠道可以提供12"口徑的鋁筒或碳纖筒, 用作望遠鏡筒?

我相信國內應該有廠商做, 不過唔知邊道可以揾到.

我都搵緊這方面資料。
依家磡反射大鏡比以前幸福，配件選擇多，又比以前平，可以大尋星鏡，雙速調焦座，就算自己唔磨鏡，買塊10至12吋既主鏡都好平，再加個2吋廣角目鏡，睇deep sky一流，真係不可同日而語......

其實可以考慮自己做，

我們以前用碳纖做水火箭，十分硬淨！

材料是混合膠加纖維布，價錢也不太貴。

[BossKwan]

請問大家有無渠道可以提供12"口徑的鋁筒或碳纖筒, 用作望遠鏡筒?

我相信國內應該有廠商做, 不過唔知邊道可以揾到.

我都搵緊這方面資料。
依家磡反射大鏡比以前幸福，配件選擇多，又比以前平，可以大尋星鏡，雙速調焦座，就算自己唔磨鏡，買塊10至12吋既主鏡都好平，再加個2吋廣角目鏡，睇deep sky一流，真係不可同日而語......

其實可以考慮自己做，

我們以前用碳纖做水火箭，十分硬淨！

材料是混合膠加纖維布，價錢也不太貴。

依! 似乎行得通....不過功夫都可能幾多.

[bingsze]

我地以前是用水喉做模的，在水喉面加一層微波爐膠紙，

然後將混合膠加纖維布加在水喉外，

待所有野乾了就十分硬和輕了。如果不是圓形，就可以自己

做個模。

[anguslau]

I remember a while ago (last year?) someone posted a source (in mainland china) of carbon fibre tubes here. Not sure if all carbon fibre tubes are suitable for telescope making...

I am also thinking about making a 10/12" astrograph myself. Though I am a novice in this area. If there are sufficient interest, I wonder if experienced people such as Subaru, Wah, Wong sir etc etc can help out in forming a small group for such an exercise?

My initial thoughts are:
1) 300mm f/3.8 parabolic mirror; purchased if possible, but can grind if necessary and there are someone who can guide me
2) carbon fibre tube for reduced weight and less sensitivity to temp changes
3) 3/4" focuser, motorised; rigid enough for astro imaging
4) using Philipp Keller 3" corrector (0.95x) gives 50mm corrected field (-> 300mm f/3.6 f.l.=1083mm); accommodates upto 16803 or similar sensor
5) using Philipp Keller 3" reducer (0.73x) gives 28mm corrected field (-> 300mm f/2.8 f.l.=832mm); accommodates upto APS-C sensors
6) weight <14kg; can be carried by EM-200; is this possible??

[anguslau]

This was the previous thread on carbon fibre tube. You probably remember as you were in those discussions...
http://www.hkastroforum.net/viewtopic.p ... sc&start=0

[Subaru]

我地以前是用水喉做模的，在水喉面加一層微波爐膠紙，

然後將混合膠加纖維布加在水喉外，

待所有野乾了就十分硬和輕了。如果不是圓形，就可以自己

做個模。

原來bingsze sir有經驗整carbon fibre筒, 可否帶領我地教我地整?

我聽講Carbon fibre筒加工比較困難, 如開focuser個口同鑽洞好似好易會鑽爆個筒.

[Subaru]

I remember a while ago (last year?) someone posted a source (in mainland china) of carbon fibre tubes here. Not sure if all carbon fibre tubes are suitable for telescope making...

I am also thinking about making a 10/12" astrograph myself. Though I am a novice in this area. If there are sufficient interest, I wonder if experienced people such as Subaru, Wah, Wong sir etc etc can help out in forming a small group for such an exercise?

My initial thoughts are:
1) 300mm f/3.8 parabolic mirror; purchased if possible, but can grind if necessary and there are someone who can guide me
2) carbon fibre tube for reduced weight and less sensitivity to temp changes
3) 3/4" focuser, motorised; rigid enough for astro imaging
4) using Philipp Keller 3" corrector (0.95x) gives 50mm corrected field (-> 300mm f/3.6 f.l.=1083mm); accommodates upto 16803 or similar sensor
5) using Philipp Keller 3" reducer (0.73x) gives 28mm corrected field (-> 300mm f/2.8 f.l.=832mm); accommodates upto APS-C sensors
6) weight <14kg; can be carried by EM-200; is this possible??

This is an interesting project.

Here are some comments to your initial thoughts:
1. 12" f/4 mirror, buy it, there are lot of choices like RF Royce, Steven, etc..... that can serve the purpose.
2. The f/4 light cone could be a bit more difficult to process, due to the inherit vignetting effect of this thick light cone. A f/5 is more easy for the flat field processing.
3. I think a 12" reflector is way too much for the EM-200. I would say the EM200 is more comfortable in handing 6-8" astrographs (light weight one, not the Takahashi tank like 8"). Even a 10" is the beyond max max for the EM-200, I think. If you would like to go ahead for a 12", a EM-400 (at least) or Paramount (preferred) is needed for the photographic requirements.

I am thinking of a short focus 10" general purpose Newtonian for the EM-200.

[Nosneb]

我地以前是用水喉做模的，在水喉面加一層微波爐膠紙，

然後將混合膠加纖維布加在水喉外，

待所有野乾了就十分硬和輕了。如果不是圓形，就可以自己

做個模。

原來bingsze sir有經驗整carbon fibre筒, 可否帶領我地教我地整?

我聽講Carbon fibre筒加工比較困難, 如開focuser個口同鑽洞好似好易會鑽爆個筒.

bingsze講緊呢種會唔會係glass fiber而唔係carbon fiber呢? 不過不論係邊種, 我都有興趣學造.

[max_kwok]

....... 如開focuser個口同鑽洞好似好易會鑽爆個筒.

分享一下少少處理碳纖經驗(切割only)
cut 碳管係唔可以用普通鋸/cutter etc.的東西，要用高速的cut碟先得
如果唔係會爆/"被"口
基本上個process係等於高速磨走個切口d碳，所以cut時要預備吸塵機吸碳粉
我估只要個鑽夠快都唔會咁易鑽爆，不過要小心唔好吸到d碳粉

[bingsze]

我地以前是用水喉做模的，在水喉面加一層微波爐膠紙，

然後將混合膠加纖維布加在水喉外，

待所有野乾了就十分硬和輕了。如果不是圓形，就可以自己

做個模。

原來bingsze sir有經驗整carbon fibre筒, 可否帶領我地教我地整?

我聽講Carbon fibre筒加工比較困難, 如開focuser個口同鑽洞好似好易會鑽爆個筒.

bingsze講緊呢種會唔會係glass fiber而唔係carbon fiber呢? 不過不論係邊種, 我都有興趣學造.

原來唔係同一樣野，不過我都想睇下碳纖點樣做，

唔知和混合膠比較那種較方便？

也不知道碳纖做出來會否輕好多，

價錢又會否貴好多，有人如果會用碳纖的就說兩句吧！

[鄧登凳]

我地以前是用水喉做模的，在水喉面加一層微波爐膠紙，

然後將混合膠加纖維布加在水喉外，

待所有野乾了就十分硬和輕了。如果不是圓形，就可以自己

做個模。

原來唔係同一樣野，不過我都想睇下碳纖點樣做，

唔知和混合膠比較那種較方便？

也不知道碳纖做出來會否輕好多，

價錢又會否貴好多，有人如果會用碳纖的就說兩句吧！

其實是一樣做法, 只不過是不用玻璃纖維布, 而用石墨纖維布(graphite fibre fabric)。

送你一個video http://www.carbonmods.co.uk/Products/Ca ... LK300.aspx

[bingsze]

我地以前是用水喉做模的，在水喉面加一層微波爐膠紙，

然後將混合膠加纖維布加在水喉外，

待所有野乾了就十分硬和輕了。如果不是圓形，就可以自己

做個模。

原來唔係同一樣野，不過我都想睇下碳纖點樣做，

唔知和混合膠比較那種較方便？

也不知道碳纖做出來會否輕好多，

價錢又會否貴好多，有人如果會用碳纖的就說兩句吧！

其實是一樣做法, 只不過是不用玻璃纖維布, 而用石墨纖維布(graphite fibre fabric)。

送你一個video http://www.carbonmods.co.uk/Products/Ca ... LK300.aspx

咁樣應該可以做到，成本可能在石墨纖維布身上，如果找到較平的布，

咁成個筒應該可以在幾舊水之內攪定，

但我不知這種布的價錢，

如果有平的，就真的可以試試大dobs diy 了！