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tommy_tse
週一 16 7月, 2007 20:11
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

12. Final Trimming of Telescope Body After we had tested our telescopes and we could get a clear focus via our scope, we had to cut out the extra length of the telescope tubing near the main mirror holder. Before cutting, we stuffed some cloth or newspaper inside the end of tube to avoid dust going ...
tommy_tse
週一 16 7月, 2007 20:08
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

11. Collimation and Testing

Our class tutors had helped us in collimating our newly made telescopes and we couldn't wait to test drive our scopes!
tommy_tse
週一 16 7月, 2007 20:06
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

My telescope was finally assembled! You may notice that I had made a mistake in drilling the three holes for the main mirror holder. Choi Sir had asked me a few times if I was certain about where I wanted to drill the holes. Wong Sir also saw the positions of where I wanted to drill with markings. H...
tommy_tse
週一 16 7月, 2007 20:06
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

Choi Sir made a special brush for us to clean the dust inside the tubing.
tommy_tse
週一 16 7月, 2007 20:05
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

10. Installing the Main Mirror Holder We assembled the main mirror holder and tried to put it toward the end of the PVC tube. Since all PVC tubes were not perfectly circular, Choi Sir had to use a vice to help us make the PVC tubing temporarily circular to make it easier to slide the holder inside t...
tommy_tse
週一 16 7月, 2007 20:01
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

8. More Picture of Secondary Mirror Assembly 9. Installing the Focuser We marked the line where the focuser should be installed. Choi Sir took us to the adjacent tool room in the basement of the space Museum to drill a big hole for everyone. Note that I had make one side of the hole bigger and flatt...
tommy_tse
週一 16 7月, 2007 19:57
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

8. Assembly of Telescope Parts - Spider My PVC tube (almost everyone's) was not perfectly circular. I was taught to put the focuser on the elongated side where there would be more distance to focus after assembly. We then drilled the three holes on the side to mount the spider. Wah! helped us glue t...
tommy_tse
週一 16 7月, 2007 19:51
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

7. Preparing the Length of the Telescope Body

After knowing the focal length of our mirrors, we were shown how to use old newspaper to wrap around the PVC tube to make a straight line around the tube. We were also shown how to use the saw to cut away part of the PVC tubing.
tommy_tse
週一 16 7月, 2007 19:50
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

6. The Contruction Plan

豆貓 explained to us the construction plan of our telescope.
tommy_tse
週一 16 7月, 2007 19:47
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

4. Painting the Interior of the PVC Tubing Choi Sir prepared the black paint with thinner and we use an angular brush to paint the inside of the PVC water pipe. We left the painted tubes out in the sun to let them dry. 5. Ronchi Test To Evaluate Our Mirror Quality and Measure the Focal Length Layana...
tommy_tse
週一 16 7月, 2007 19:37
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

3. More Pictures of Measuring the Focal Length Under the Sun
tommy_tse
週一 16 7月, 2007 19:36
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
回覆: 127
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

3. Estimating the Focal Length of Our Telescopes

Before knowing which PVC tubing length was right for our mirrors, Wong Sir took all of us outside the Space Museum to measure the focal length of our mirrors using the sun.
tommy_tse
週一 16 7月, 2007 19:33
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
回覆: 127
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

2. Passing Out of Telescope Parts Parts were given to every student to make a newtonian telescope. There were parts to make (a) the spider that held the secondary mirror (b) the holder of the main mirror and (c) the focuser and the eyepiece holder (d) the body of the telescope by PVC water pipe. Won...
tommy_tse
週一 16 7月, 2007 19:28
版面: 自製天文望遠鏡 Amateur Telescope Making
主題: 天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007
回覆: 127
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天文望遠鏡製作 2007 (第十三課 - 實習課6) 15 July 2007

A sample of a mirror that needed more time in 拋光。You can see a foggy center.

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