天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
Here is my report from our last practice lesson.
最後由 tommy_tse 於 週二 26 6月, 2007 00:37 編輯,總共編輯了 2 次。
天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
I started the lesson to complete the polishing using Sand #600. I did 6 runs of 5 minutes each with W-Stroke method. I spent a total of 2 hours from last lesson to this lesson to complete this.
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最後由 tommy_tse 於 週二 26 6月, 2007 14:27 編輯,總共編輯了 1 次。
天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
I spent one hour right before lunch to complete 6 runs of 5 minutes each W-stroke method using Sand # 1200.
I tested the mirror via reflection angle method during 600 and 1200 stages.
I tested the mirror via reflection angle method during 600 and 1200 stages.
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最後由 tommy_tse 於 週二 26 6月, 2007 18:46 編輯,總共編輯了 8 次。
天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
Here is a pictorial record of the steps involved for making the Pitch Lap.
1. Wah! was melting the pitch over a stove.
2. Put the mirror and the tools in hot water.
3. Put paper strip around the tool.
4. Melted pitch was being poured on the convex upper face of the tool.
5. 豆豸苗 helped us to press the mirror quickly after melted pitch was poured.
6. Cut away the extra pitch around the mirror.
7. Use rules to prepare the lines for channel cutting.
8. Cut Channels in the Pitch Lap.
9. Cut in 30 degree angle around the rim of the Pitch Lap.
10. Put rouge-water mixture on the Pitch Lap before cold press.
11. Cold Pressed for almost 1 hour and 15 minutes.
12. During the cold press process, Wah! was helping us to check the degree of matching between the mirror and the Pitch Lap by 'banging" slightly the set of glasses onto the table in order to separate the two pieces of glass.
13. Finsihed when the rouge mixture is evenly distriburted on the Pitch Lap; we are ready to polish.
1. Wah! was melting the pitch over a stove.
2. Put the mirror and the tools in hot water.
3. Put paper strip around the tool.
4. Melted pitch was being poured on the convex upper face of the tool.
5. 豆豸苗 helped us to press the mirror quickly after melted pitch was poured.
6. Cut away the extra pitch around the mirror.
7. Use rules to prepare the lines for channel cutting.
8. Cut Channels in the Pitch Lap.
9. Cut in 30 degree angle around the rim of the Pitch Lap.
10. Put rouge-water mixture on the Pitch Lap before cold press.
11. Cold Pressed for almost 1 hour and 15 minutes.
12. During the cold press process, Wah! was helping us to check the degree of matching between the mirror and the Pitch Lap by 'banging" slightly the set of glasses onto the table in order to separate the two pieces of glass.
13. Finsihed when the rouge mixture is evenly distriburted on the Pitch Lap; we are ready to polish.
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最後由 tommy_tse 於 週二 26 6月, 2007 18:25 編輯,總共編輯了 3 次。
天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
Here is a pictorial record of the steps involved for making the Pitch Lap (cont'd).
6. Cut away the extra pitch around the mirror.
7. Use rules to prepare the lines for channel cutting.
8. Cut Channels in the Pitch Lap.
9. Cut in 30 degree angle around the rim of the Pitch Lap (No Photo).
6. Cut away the extra pitch around the mirror.
7. Use rules to prepare the lines for channel cutting.
8. Cut Channels in the Pitch Lap.
9. Cut in 30 degree angle around the rim of the Pitch Lap (No Photo).
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最後由 tommy_tse 於 週二 26 6月, 2007 18:48 編輯,總共編輯了 7 次。
天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
Here is a pictorial record of the steps involved for making the Pitch Lap (cont'd).
10. Put rouge-water mixture on the Pitch Lap before cold press.
11. Cold Pressed for almost 1 hour and 15 minutes.
12. During the cold press process, Wah! was helping us to check the degree of matching between the mirror and the Pitch Lap by 'banging" slightly the set of glasses onto the table in order to separate the two pieces of glass.
13. Finsihed when the rouge mixture is evenly distriburted on the Pitch Lap; we are ready to polish.
10. Put rouge-water mixture on the Pitch Lap before cold press.
11. Cold Pressed for almost 1 hour and 15 minutes.
12. During the cold press process, Wah! was helping us to check the degree of matching between the mirror and the Pitch Lap by 'banging" slightly the set of glasses onto the table in order to separate the two pieces of glass.
13. Finsihed when the rouge mixture is evenly distriburted on the Pitch Lap; we are ready to polish.
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最後由 tommy_tse 於 週二 26 6月, 2007 18:49 編輯,總共編輯了 3 次。
天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
Choi Sir was demonstrating his homemade setup with handheld controller to perform the Knife-edge Test (or Shadow Test).
Layanata added his digital camera to let us see image of the mirror (vertical lines).
Layanata added his digital camera to let us see image of the mirror (vertical lines).
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最後由 tommy_tse 於 週二 26 6月, 2007 18:58 編輯,總共編輯了 3 次。
天文望遠鏡製作 2007 (第十一課 - 實習課5) 24 June 2007
Wong Sir demonstrated to us how to use W-Stroke to do the polishing of the mirror using rouge mixture.
After one hour of polishing after cold press, the rough mixture on my Pitch Lap looks quite pleasing with chocolate color evenly distributed. I am now ready to polish the mirror for another 10 to 20 hours at home to completion. We'll see ...
After one hour of polishing after cold press, the rough mixture on my Pitch Lap looks quite pleasing with chocolate color evenly distributed. I am now ready to polish the mirror for another 10 to 20 hours at home to completion. We'll see ...
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最後由 tommy_tse 於 週二 26 6月, 2007 18:55 編輯,總共編輯了 2 次。
Because of Wongsir's "urge", I try typing English in forum. Please guide me if there is anything wrong.
I'm preparing for my final exam these weeks so I just upload photos now.
I'm preparing for my final exam these weeks so I just upload photos now.
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- who's ripping the Bitumen/Pitch Lap off?
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- towers
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- bubbles like cat claw
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最後由 natameow 於 週二 26 6月, 2007 17:36 編輯,總共編輯了 1 次。
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- the first one who'll burnish his "lens/mirror" this year. (in this case, how to mention the glass?)
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- another style of "tower"
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- "whole face" @@"
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- this mate is also shovelling his Pitch Lap
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最後由 natameow 於 週二 26 6月, 2007 17:38 編輯,總共編輯了 1 次。
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