The making of 30 in telescope - 38, altitude motor drive

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
回覆文章
Chanlunlun
夸克星
文章: 3847
註冊時間: 週四 09 10月, 2003 21:06

The making of 30 in telescope - 38, altitude motor drive

文章 Chanlunlun » 週三 08 3月, 2006 23:59

Dear ATMs,

The altitude axis motor drive has just been finished and tested OK.

The drive consists of a motor and a gear to slow down the speed by four times. It is then coupled to a belt which drive a big pulley fixed onto the altitude bearing.

In order for the telescope to be movable by hand, a released mechanism is included in the drive. A wing –nut will engage the motor drive onto the altitude axis while tightening and upon loosening the same nut the motor drive be disengaged, making hand slewing of telescope possible.

The mechanical part of the slow motion drive has been finished. The next step will be the installation of the electronic control system for the two motors ( azimuth and altitude ).

Best regards
Chan Yuk Lun
8-3-2006
附加檔案
30_65.jpg
The altitude axis after installation of the motor drive.
30_65.jpg (52.5 KiB) 已瀏覽 10255 次
30_57.jpg
The altitude bearing before the installation of the motor drive.
30_57.jpg (137.39 KiB) 已瀏覽 10255 次
30_64.jpg
The altitude motor drive. It consists of a motor assembly and a big pulley. The big pulley is driven by a timing belt through a tooth-wheel driven by the motor.
30_64.jpg (50.31 KiB) 已瀏覽 10255 次

頭像
simonii
白矮星
文章: 647
註冊時間: 週五 19 12月, 2003 18:20

文章 simonii » 週四 09 3月, 2006 01:37

Dear Chanlunlun,
Why don't you think about an EQ platform? Az-Alt is surely much easier to make compared with EQ platform, but it is much desirable to have EQ tracing in such a large and long focal length telescope.
cheers,
Simon

Chanlunlun
夸克星
文章: 3847
註冊時間: 週四 09 10月, 2003 21:06

文章 Chanlunlun » 週四 09 3月, 2006 07:06

simonii 寫:Dear Chanlunlun,
Why don't you think about an EQ platform? Az-Alt is surely much easier to make compared with EQ platform, but it is much desirable to have EQ tracing in such a large and long focal length telescope.
cheers,
Simon
Dear Mr. Simonii,

The volume and weight of an equatorial platform that could support a 30 inch telescope is too big. The platform is prohibitively too massive to be taken out to field. In addition an equatorial platform could only track for a short time, 45 minutes maximum.

Actually we'd made one equatorial platform for our 14 inch Newtonian, but seldom be used for its prohibitive volume. If we scale up the EQ platform to carry a 30 inch scope, It is unthinkable.

Alt-Az motors, on the other hand, are very tiny and add only one to two lbs to the total weight of the telescope, fully compactable with our "outdoor" policy. Last but not least they could track for unlimited time, all you need to do is just pressing some buttons, adding some fun to the long observation night.

Best regards
Chan Yuk Lun

頭像
hunter_大祭司
紅巨星
文章: 416
註冊時間: 週二 01 3月, 2005 18:30
來自: 神的國度

Re: The making of 30 in telescope - 38, altitude motor drive

文章 hunter_大祭司 » 週四 09 3月, 2006 16:43

乜皮帶靠得住麼!? :roll:

Chanlunlun
夸克星
文章: 3847
註冊時間: 週四 09 10月, 2003 21:06

Re: The making of 30 in telescope - 38, altitude motor drive

文章 Chanlunlun » 週四 09 3月, 2006 17:55

hunter_大祭司 寫:乜皮帶靠得住麼!? :roll:
Dear Mr. Hunter,

This is not ordinary belt but what we call a "timing belt". It is a kind of belt used in precision machines such as exhaust valve timing in car engine, printer head in ink jet printer......etc.

It is very reliable. We tested it last night. The slow motion is functioning good, at least we enjoyed it in high power lunar observation. The telescope will go and stop to anywhere on the lunar surface we like, with just a press of button.

Best regards
Chan Yuk Lun

頭像
hunter_大祭司
紅巨星
文章: 416
註冊時間: 週二 01 3月, 2005 18:30
來自: 神的國度

文章 hunter_大祭司 » 週二 14 3月, 2006 19:28

Chanlunlun 寫:
simonii 寫:Dear Chanlunlun,
Why don't you think about an EQ platform? Az-Alt is surely much easier to make compared with EQ platform, but it is much desirable to have EQ tracing in such a large and long focal length telescope.
cheers,
Simon
Dear Mr. Simonii,

The volume and weight of an equatorial platform that could support a 30 inch telescope is too big. The platform is prohibitively too massive to be taken out to field. In addition an equatorial platform could only track for a short time, 45 minutes maximum.

Actually we'd made one equatorial platform for our 14 inch Newtonian, but seldom be used for its prohibitive volume. If we scale up the EQ platform to carry a 30 inch scope, It is unthinkable.

Alt-Az motors, on the other hand, are very tiny and add only one to two lbs to the total weight of the telescope, fully compactable with our "outdoor" policy. Last but not least they could track for unlimited time, all you need to do is just pressing some buttons, adding some fun to the long observation night.

Best regards
Chan Yuk Lun
那麼假極的現像你們如何解決哦? :wink:

頭像
Subaru
夸克星
文章: 6693
註冊時間: 週三 02 7月, 2003 19:27

文章 Subaru » 週二 14 3月, 2006 23:42

hunter_大祭司 寫:那麼假極的現像你們如何解決哦? :wink:
陳sir支鏡係目視用, 唔洗理假極問題嫁.

頭像
hunter_大祭司
紅巨星
文章: 416
註冊時間: 週二 01 3月, 2005 18:30
來自: 神的國度

文章 hunter_大祭司 » 週三 15 3月, 2006 12:43

Subaru 寫:
hunter_大祭司 寫:那麼假極的現像你們如何解決哦? :wink:
陳sir支鏡係目視用, 唔洗理假極問題嫁.
唔影相?!有點兒浪費哦! :cry: :cry: :cry: :cry: :cry:

Chanlunlun
夸克星
文章: 3847
註冊時間: 週四 09 10月, 2003 21:06

文章 Chanlunlun » 週三 15 3月, 2006 13:47

hunter_大祭司 寫:唔影相?!有點兒浪費哦! :cry: :cry: :cry: :cry: :cry:
Dear Mr. Hunter,

To me, under a real starry sky, with real extreme transperancy, the only value for a real big telescope is to LOOK THROUGH it.

It's a big pity that you just let the photons from the nebula, galaxies and distant stars not reaching your retina but onto the a lifeless surface of CCD.

I firmly belief that the glory of Heaven should be seen by our own eyes, directly.

Best regards
Chan Yuk Lun

頭像
hunter_大祭司
紅巨星
文章: 416
註冊時間: 週二 01 3月, 2005 18:30
來自: 神的國度

文章 hunter_大祭司 » 週三 15 3月, 2006 17:56

Chanlunlun 寫:
hunter_大祭司 寫:唔影相?!有點兒浪費哦! :cry: :cry: :cry: :cry: :cry:
Dear Mr. Hunter,

To me, under a real starry sky, with real extreme transperancy, the only value for a real big telescope is to LOOK THROUGH it.

It's a big pity that you just let the photons from the nebula, galaxies and distant stars not reaching your retina but onto the a lifeless surface of CCD.

I firmly belief that the glory of Heaven should be seen by our own eyes, directly.

Best regards
Chan Yuk Lun
哦......! :o :wink:和興刀模29044322,可以幫你用氣體激光射出很完美的木樣(包括你所造的鏡台每一部分)收費很平... 8) :D

頭像
Subaru
夸克星
文章: 6693
註冊時間: 週三 02 7月, 2003 19:27

文章 Subaru » 週三 15 3月, 2006 23:51

Chanlunlun 寫:To me, under a real starry sky, with real extreme transperancy, the only value for a real big telescope is to LOOK THROUGH it.

I firmly belief that the glory of Heaven should be seen by our own eyes, directly.

Best regards
Chan Yuk Lun
Too true too true!

回覆文章

回到「自製天文望遠鏡 Amateur Telescope Making 」

誰在線上

正在瀏覽這個版面的使用者:沒有註冊會員 和 6 位訪客