16 inch ultra light weight telescope - version 2.0

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
Chanlunlun
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16 inch ultra light weight telescope - version 2.0

文章 Chanlunlun » 週二 30 6月, 2015 11:51

Dear ATMers,

It has been a long waiting for the carbon fiber tubes. They finally arrived.

Immediately I upgraded my single pole 16 incher to a carbon fiber struss design. Carbon fiber is very light weight yet capable of bearing huge tension. A little bit high-tech taste is added to this final version of the 16 incher.

Each carbon fiber tube has a diameter of 6 mm and a total length of 1500 mm. In order to fit in the suitcase for air travel the carbon fiber tubes were cut to a length of 500 mm, and connected by PVC connectors when in use.

A top ring was also added to fix up the focuser, the single arm diagonal holder and the finderscope. The additional top ring and the 8 carbon fiber struss has a total weight just below that of the wooden single pole and the steel cables. So the total weight of version 2.0 is still below 15 kg but with the advantage of stability of struss structure.

Now I have two options at hand to choose from – the carbon fiber struss or the wooden single pole. I opt for carbon fiber (obviously).

Best regards
Chan Yuk Lun
30 June 2015
附加檔案
19.jpg
This is what you see when looking in to the focuser without eyepiece. The diagonal mirror is the smallest (2.6 inches minor axis) that can still cover all the light cone from the primary mirror.
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18.jpg
Connection between the carbon tubes and top ring.
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17.jpg
The top ring with everything fixed onto.
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16.jpg
The top ring, with the PVC focuser, the single arm diagonal holder and diagonal mirror, the light shield.
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15.jpg
The red dot finder, this is the lightest weight finder that I can find.
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14.jpg
The PVC connectors to join two carbon fiber tubes.
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13.jpg
The carbon fiber struss structure, version 2.0. The total weight is slightly less than the single pole but it vastly improves the stability.
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12.jpg
Version1.0, the single pole structure. It’s simple and light weight yet cannot offer the same stability a struss design have.
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11a.jpg
The 6 mm carbon fiber tubes. Long waiting time.
11a.jpg (324.06 KiB) 已瀏覽 5648 次

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Steve
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文章 Steve » 週二 30 6月, 2015 14:20

瘦身成功 [Good Job] [蔥寶恭喜樣]

AlexWong
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文章 AlexWong » 週二 30 6月, 2015 15:35

fabulous [Good Job]

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Eddy So
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文章 Eddy So » 週二 30 6月, 2015 20:47

[Good Job] 成功減磅! [Good Job]

Chanlunlun
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文章 Chanlunlun » 週四 02 7月, 2015 08:07

Eddy So 寫:[Good Job] 成功減磅! [Good Job]
Hi Eddy,

Actually the total weight just reduces by about 0.1 kg, nothing significant.

But the outlook is vastly improved. It looks more high tech and symmetrical than the single pole design. It's being much more stable, in terms of optical alignment, than the single pole design.

大黃傻貓GARFIELD
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文章 大黃傻貓GARFIELD » 週四 02 7月, 2015 18:20

Such a marvelous work of craftmanship Can't wait to see it in action. :D

Chanlunlun
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文章 Chanlunlun » 週五 03 7月, 2015 13:53

大黃傻貓GARFIELD 寫:Such a marvelous work of craftmanship Can't wait to see it in action. :D
The scope will be put to field test before departing HK. Most probably it will happen in the coming week.

Stay tuned.

Water
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文章: 401
註冊時間: 週一 23 6月, 2014 01:40
來自: H.K.

文章 Water » 週五 03 7月, 2015 15:03

鏡神 Chanlunlun 兄:

根據香港天文台天氣預報,7月4日之後開始多雲有雨,看來短期內明晚是新製 16 吋牛反帶到 PTC 進行實地測試的最後機會。

anyone
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文章 anyone » 週五 03 7月, 2015 15:27

[完美計劃]

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bingsze
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文章 bingsze » 週五 03 7月, 2015 18:56

How about the whole dons become an carbon fiber one ?

First, you can bring it to Australia.

Second, you can reduce the weight.

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wtyu21
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註冊時間: 週三 30 5月, 2007 04:18
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文章 wtyu21 » 週六 04 7月, 2015 00:35

Mirror God~Bravo~ :D :D :D

Chanlunlun
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文章 Chanlunlun » 週六 04 7月, 2015 08:02

bingsze 寫:How about the whole dons become an carbon fiber one ?

First, you can bring it to Australia.

Second, you can reduce the weight.
Carbon fiber is very expensive. It's not practical to do the total conversion.

I am now working on version 3.0 to further strengthen the structure.

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bingsze
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文章 bingsze » 週六 04 7月, 2015 13:10

唔使全部都係,揾一點eddy哥同你打印出黎就0k啦

Chanlunlun
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文章 Chanlunlun » 週日 05 7月, 2015 09:12

bingsze 寫:唔使全部都係,揾一點eddy哥同你打印出黎就0k啦
The mechanical strength of 3D printed parts may be a little bit on the low side.

Now I am wondering a hybrid design of wood + carbon fiber. Version 3.0 will soon be released, stay tuned.

syyuen168
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文章 syyuen168 » 週日 05 7月, 2015 10:23

Magnesium tubes can be a good alternative. It has a very high strength and yet more ductile than carbon fibre. But I do not know if you can easily get them in China.

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