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smallest travel 10’´ dobson in a laptop bag

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#1 laurent the french (sorry)

laurent the french (sorry)

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Posted 12 December 2018 - 02:41 AM

hello american pepple
sorry for my poor english i m french 

 

i have a disease : a neropathy and i don’t know time to live . i m in hospital now

before th beginning on my probleme , i make a travel 10’´ very very compact : it can be travel this full part ( thruss tube includes )in a laptog bag ... whith enough place for a standard laptop wink.gif

i present it only two french star party : RCE in 2014 and RAP in 2016 ( hill in 2015  , sorry )
my presentation of 30 minutes only was here  http://laurentastro....n-version-fine/
sorry it s all in french  

with a friend we will make a youtube complety different where a explain all part whith the why of them
sorry it will be in french too
if some what tanslate in english , i can send the ppt ( when i can go out of my hospital )
i have make no real plan but whith all picture , you can productuted yours

my secret , not visible on picture , in the use of neodymne magnets in th spider , the sesondary and pass-filter

i can answer ( with using google translator ) as you want via a private message with only my phone
for more pictures , wait please when i can go home please

i can explain how to do to make smaller

 

laurent

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Edited by nicknacknock, 12 December 2018 - 04:29 AM.

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#2 robertasumendi

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Posted 12 December 2018 - 03:15 AM

Welcome Laurent, beautiful scope! I love that it fits into a normal briefcase so it becomes easy to carry. Thanks for posting so many photos of its construction!

 

Robert



#3 Jason_J

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Posted 12 December 2018 - 04:32 AM

Fantastic, well done. Thank you for sharing this great idea.



#4 laurent the french (sorry)

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Posted 12 December 2018 - 04:48 AM

for explain and traduction : ask me
i answer if i can ( or use google tracdutor )

#5 Pinbout

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Posted 12 December 2018 - 06:50 AM

Nice landscape on the background of the telescope. waytogo.gif



#6 starcanoe

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Posted 12 December 2018 - 07:19 AM

Sorry to hear of your health problems.

 

Nice work there !

 

Gotta make one of those scopes myself one day...

 

take care



#7 laurent the french (sorry)

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Posted 12 December 2018 - 08:14 AM

a friend ( we make since 3 years the travel to go to THE franch star party in the same car ) made an « human makable » of my version  of the slim : https://www.webastro...k-divisé-par-3/

don t need to translate : people who never made a telescope said that he ( not me hi hi !! ) was stupid 

you have pictures of three dobson : in red a « strock » made by a young suiss of 15 years ( 15 cm of box) , the « human slim » of christophe of 8 cm and mine with a box of 5cm or 2’´ :) 

 

but with understand my concepts he make ( ok in wood  ) a 10’´ in  7,5 cm 

 

ask to him too wink.gif

 


Edited by laurent the french (sorry), 12 December 2018 - 08:23 AM.


#8 bunyon

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Posted 12 December 2018 - 09:52 AM

That's awesome. I'm working on one for a slightly larger briefcase but it will look like a giant next to yours. Very cool.

 

I hope you return to health soon. Thanks for sharing.



#9 starcanoe

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Posted 12 December 2018 - 09:56 AM

All good work !

 

I really like the way the diagonal / secondary can be adjusted.



#10 ckh

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Posted 12 December 2018 - 10:15 AM

Excellent.



#11 laurent the french (sorry)

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Posted 12 December 2018 - 11:01 AM

sorry my english is poor 

i m not at home with my dob , no computer , only sheet of paper and a black pen 

my phone is not able to manipulate picture 

 

then help me please :) 

 

each part of  my slim had special  points to be so compact  . i prepare a youtube of more than one hour to try to explain each point ( in french sorry ) 

 

can you make capture on my picture of what you don t understand and i  try to explain why and what it s work 

 

it s ok ? 



#12 bunyon

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Posted 12 December 2018 - 11:16 AM

No need to apologize for your English. I imagine it's better than most of our French. 



#13 stargazer193857

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Posted 12 December 2018 - 09:13 PM

Very good design. The portability is fantastic. I would use a faster f ratio and slightly thicker poles, even a double truss. You got me wanting to make something similar now.

#14 laurent the french (sorry)

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Posted 13 December 2018 - 12:09 AM

i use an old mirror at 4,5 ratio , i have not enough money to buy a new one

try to make plans , i help you and may be when i able to go at home i januray i ll make picture of mine

another secret : for equilibraction , i use a little bag with two drink who i attach near the mirror . no weight and no place during transport ;)

Edited by laurent the french (sorry), 13 December 2018 - 12:16 AM.


#15 laurent the french (sorry)

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Posted 13 December 2018 - 12:41 AM

make more smaller ?
analyse a little and you find thaht the tube of the kineopitcs is the limit
you can take one milimeter of free around him and if you not have fear divise the thin of the box by two for three or four milimeter more

the more important is to have a 25mm thin mirror

Edited by laurent the french (sorry), 13 December 2018 - 06:26 AM.


#16 LarsMalmgren

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Posted 14 December 2018 - 08:04 AM

Excellent work Laurent waytogo.gif bow.gif


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#17 CDLC

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Posted 14 December 2018 - 11:25 AM

Hi Guys,

 

I'm Christophe, the youtube friend Laurent talked you about.

I can confirm that Laurent's telescope is absolutely amazing.

 

I've made my own "humanly buildable" wooden version, that you'll find here (sorry it's in french):

https://www.webastro...k-divisé-par-3/

 

NB : in France, we call those "foldable telescopes" Strocks. By the name of Pierre Strock who was the first one to design one.

 

For the youtube channel, you can join me here (it's in french also), but you'll find some intresting contents, including observation videos.

https://www.youtube.com/cdlc48

 

Have a good sky, best regards!

 

Christophe - the photoStrockeur!



#18 laurent the french (sorry)

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Posted 14 December 2018 - 12:28 PM

i have a weekend of waiting :(

ask me question ! please

#19 laurent the french (sorry)

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Posted 15 December 2018 - 01:14 AM

I'm bored at the hospital
I will do some tips in the order
let's start with the barrel

to reduce the thickness, it is necessary to melt them into each other
the rod end m3 is the key
it supports 3kg and is 8mm
the aluminum plate is the same thickness, perfect
the triangle was split to make room for it but just enough so that the patella smooth body (blunder model) s slips. it blocks unwanted rotation
the rest is guessable in the photos

then you can have a barel cell of 18 points in 8+1 ( for the contacts) mm
there are different ros end , only one is good

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Edited by laurent the french (sorry), 15 December 2018 - 03:19 AM.


#20 laurent the french (sorry)

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Posted 15 December 2018 - 08:09 AM

 good morning or good evening

 

sorry , i use google translator 

 

if you look at the telescopes sold and said compact, they all have the same flaw: the spider and the secondary mirror make lose a bigger one!

pierre strock has reduced this volume with his three-armed spider. but to go further, push the concept even further: Demonstrate the secondary
it is not a revolution, others have been for a long time.

as I wanted to do everything in carbon and that it does not like small shapes at right angles, I have to trick
the carbon surrounds the main branch of the spider and then goes to collimation screws following the angle of the mirror.
nothing forward for the third screw! normal smile.gif it is replaced by a rod end
between the two collimation screws, the carbon makes a detour to touch the small branch, and I slide in this fold the spring

the bottom plate is simple: flat except for the location of the ball screw and a solid loop for the tension spring

at this stage, it is 35mm thick and if I add the mirror, it passes more.
still magnets, and plate on the back of the mirror and this one is also demountable

 

i forget : i use of neodymne magnet hiding une the carbone ;)

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Edited by laurent the french (sorry), 15 December 2018 - 08:16 AM.


#21 laurent the french (sorry)

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Posted 15 December 2018 - 09:09 AM

third tip: my secondary mirror cage (if badly translated = google fault!)

 

after removing the kineoptics, the filter pass and the secondary mirror, remains a large circle and the branches of the spider
almost impossible to reduce ... unless ... we remove the branches (magnets and screws chc m2)

we then have a large circle that we can slide around the mirror. the height is to do it in the thickness of the mirror !!
what space saving!

look at the picture: mirror stacking, mirror case, 1mm rocker and the big black circle smile.gif

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Edited by laurent the french (sorry), 15 December 2018 - 09:10 AM.


#22 laurent the french (sorry)

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Posted 15 December 2018 - 09:29 AM

mistake


Edited by laurent the french (sorry), 15 December 2018 - 09:48 AM.


#23 laurent the french (sorry)

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Posted 15 December 2018 - 09:31 AM

last big trick: the bearings
we do not really know what to do with it
an idea came to me looking at a box of cheese banned in the usa (you do not know what you lose!)

the edge is thick, ideal for the ptfe, but the thickness remains fine once in place
more ca it takes resistance materials design and alleviates everything
simple but effective

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Edited by laurent the french (sorry), 15 December 2018 - 09:47 AM.


#24 stargazer193857

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Posted 15 December 2018 - 10:33 AM

If your collimation holds at all, it makes me wonder if I'm seriously over engineering my designs.
Dennis at DobStuff makes very light weight portable dobs that I did not want to buy because I suspected they flex. But he claims his don't flex too much.

#25 stargazer193857

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Posted 15 December 2018 - 10:37 AM

I can see the flex in the picture. Doubling the tube diameter would not add much weight or space but would dramatically decrease flex. If the telescope, an in more overlap would make a difference.


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