Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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Hello every one,
In the following thread I would like to introduce my 1st dobsonian telescope project, I have read a lot but still know a little, so I decided to mix all what I have read together and produce the upcoming telescope.
I might be correct sometimes and wrong sometimes, so any comment will be welcome, I just want to help other novice like me to get benefit from my ideas and mistakes.
I will start from the very beginning so hang on there don’t get bored too soon, also I will try to post more photos than comments as one photo worth 1000 words and maybe more especially in ATM.
Maybe my playing cards are still mixed (which thing to do 1st) but any way I’ve decided to start.
Thanks in advanced to every one who will participate in the party or even watch it out.
So lets rock and roll……. 
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
Edited by Adventurer (03/13/08 03:06 AM)
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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6.3 meters long Aluminum tubes (wall thickness is 2 mm )
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
Edited by Adventurer (03/12/08 06:54 AM)
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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What are you cooking good looking? 
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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I get some help from this guy in order to learn how to cut Aluminum without a mess.
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
Edited by Adventurer (03/13/08 07:02 AM)
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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This will be the bottom part of the tube (mirror cell holder) the diameter is 28 CM, the mirror is 25 cm, this should be 30 cm but this what I have found. 
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
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The bear
scholastic sledgehammer
Reged: 02/11/08
Posts: 824
Loc: rushville, indiana
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this looks interesting...
doc
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Longitude -85.42786 Latitude 39.59153
"current build 6 inch F6.5 "Little Toe"
"if all else fails use duct tape "works for me"
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2682
sage
Reged: 02/18/08
Posts: 210
Loc: The Heartland
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Quote:
Maybe my playing cards are still mixed (which thing to do 1st) but any way I’ve decided to start.
I suspect just about everybody here, even those playing with a full deck, has the playing cards in their deck mixed up a bit!
I'm watching with interest, that 6.3m tubing already has me wondering what the f ratio is.
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Benders 900/9 1180/9.29
Folder LB8 1219/6
"(Sigh!) I sold it for a song. But, that song was 'White Christmas.' I made millions!" - Montgomery Burns
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ken scharf
sage
Reged: 02/09/08
Posts: 393
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Quote:
Quote:
Maybe my playing cards are still mixed (which thing to do 1st) but any way I’ve decided to start.
I suspect just about everybody here, even those playing with a full deck, has the playing cards in their deck mixed up a bit!
I'm watching with interest, that 6.3m tubing already has me wondering what the f ratio is.
I'm sure that's just the raw length he had to buy to get a good price and he intends on cutting it a bit shorter.
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jayscheuerle
Post Laureate
Reged: 01/16/06
Posts: 4073
Loc: S. Philadelphia, PA
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First projects are a blast and undoubtedly a learning experience. My batting average for complete (95%) successes is 0 for 3, though I will give two of those a partial/usable success rating while the first was a complete failure except in regards to generating the will to do better. 
Each of my failures has revolved around a lack of rigidity, either wobbling, bouncing or falling apart. That's the best I can offer.
I'm looking forward to pictures of your progress! - j
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Fight indignorance!
The Green Goblin - 12" of dobsonian excellence!
The PortaBowl-a $100 4.5" f/8 ball-scope YOU can build!
Eero2-a 6" f/5 ball-scope you probably can't. 
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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2682 wrote:
that 6.3m tubing already has me wondering what the f ratio is.
****************************************************
Ken wrote:
I'm sure that's just the raw length he had to buy to get a good price and he intends on cutting it a bit shorter.
****************************************************
You are right Ken I will cut as much as I need and keep the remaining for future project.
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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Ok lets talk about mirror cell now;
Aluminum sheet 1 cm thick. dim 47 cm X 45 cm
Very dirty and full of 0.5 mm deep scratches, sorry this is what I have found for 35$ from a junkyard, and he has no better sheets from the same thickness. 
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
Edited by Adventurer (03/13/08 03:36 AM)
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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No comment 
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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Note: This is the 1st attempt for me to cut circles shape, caution must be taken when using jigsaw especially for metal cutting, it is good to have some supervision from experienced hand to give you the necessary directions, but unfortunately I have no other choice and no help from any one and I like to do things by my self but even though I am not advising any novice hands to do this without proper help.
I have used a lot of Vaseline to cool the saw and to lubricate the cutting process, and I found it works like magic, of course I have proceeded slowly.
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
Edited by Adventurer (03/13/08 07:11 AM)
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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The circles.
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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Now I will move to another part (I will get back to mirror cell again once I've finished smoothing out its rough surface).
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Below is what I will use to connect the Aluminum tubes with the 28 cm tubes.
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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I have cut this 16 mm screws (12 pieces 50 mm long will be used to connect 6 tubes) from a big one 1 meter long using angle grinder, I don't know the proper name of that big screw, but I think it is clear.
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
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The bear
scholastic sledgehammer
Reged: 02/11/08
Posts: 824
Loc: rushville, indiana
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i have many thoughts of different things i can so with these ideas not just telescopes tools in general
doc
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Longitude -85.42786 Latitude 39.59153
"current build 6 inch F6.5 "Little Toe"
"if all else fails use duct tape "works for me"
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Mark_S
newbie
Reged: 01/09/08
Posts: 2
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The big screw is just threaded rod. Tip: put a nut on the rod before cutting it, after cutting it remove the nut over the cut portion and it will rechase the threads for you.
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rmcpb
Carpal Tunnel
Reged: 11/16/04
Posts: 1606
Loc: Blue Mountains, NSW, Australia
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This is a brilliant thread!! Keep it coming 
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Rob Browne
8" & 13" Dobs
Equatorial Platform
Couple of Panoptics and a handful of BO/TMBs
9x60 binocs
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Adventurer
professor emeritus
Reged: 11/22/07
Posts: 730
Loc: Amman, Jordan
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After 2 hours of rough grinding the aluminum plates against each others (like if I am making flat) the 4 surfaces were better some how, (next time I will search for better plate.
Below I draw 120 degrees lines and prepare the bottom cell plate for initial cutting process.
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"man is not made for defeat....A man can be destroyed but not defeated"
Regards
Rasim Ramadan
Home made 10 inches reflector.
Edited by Adventurer (03/15/08 04:14 AM)
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