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building a cooling fan


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#1 wouter84

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Posted 26 September 2013 - 09:51 AM

Hi there,

 

So after a month off frustating weather, the night finally get`s a little clear suddenly,

i moved my setup outside and then came the waiting time for the telescope to cool off......

after an hour i could start, but gues...... the fog came in.....

so i desided to build an cooling fan, so the next time, the telescope doens`t have a long cooling time....

I`ll try to explain the best i can what i did, what materials were used and the cost and techniques.

remember it also the first time for me!!!!

 

ill post as soon as possible!!!

 

clear skies


My setup:  Sky-Watcher 200 pds, Sky-Watcher NEQ6 PRO, Canon 40D Full Spectrum, A.P.T Software, Synguider, Photoshop CS6, Deepskystacker

 

:P That`s all folks

wish all of u clean skies :D


#2 wouter84

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Posted 26 September 2013 - 04:02 PM

 

The idea came from youtube from astronomyshed. The most cooling fans are just at the back off the telescope and only cool the primaire mirror from below.

to make a plastic container around it, you force the air to run around the mirror and just blow the air out in direction of the secundairy mirror.

this way I think the telescope cooles a lot faster.

 

I thought, hey i can make that too!!! :ph34r:

 

So i started to look for materials, first looked on the internet for a piece off plastic and a computer fan,

with transport cost it would have cost me about 34 euro`s.

 

The next i went to walk with my son in the city and found a computer hardware store and found a computer fan (120mmx120mm)

the price was 11 euro, so i bought it.

A few hundred meters further i saw a modelshop (for rc airplanes) i walked in and asked for a piece of plastic.

He had it! a piece of 250mm x 500mmx6mm. I only needed 250mmx250mm. So i asked for the price it was 8,40 euro and it was sold!!!

 

So I had enough plastic to make 2 pieces. ( in case i screwed one up)

 

I went home, put my son to bed and begin!!!

 

First I took the closingcap (don`t know the name in english) and put it on the plastic. I measured 250x250mm and made a line.

 

 

DSCN2371
 
 
 
After that i toke the fan and marked it on the plastic
 
DSCN2372
 
The result
 
DSCN2373

 

Then i used a sharp knife to make an incision and broke it in halve

 

DSCN2374

 

After that i used a metal saw and made the curves

 

DSCN2375
 
then i saw the edges were the bolb are for the primaire mirror.
 
DSCN2376

 

So then came the problem of the inner circle, i used a small drill and made holes across the lines
 
DSCN2378

 

Then i took a big drill and made a hole for my saw
 
DSCN2380
 
And then with lots of efford and time i cut out the inner circle, the problem was when you saw to fast the plastic melts back together
 
DSCN2381
 
after that i measured the holes for the fan. drilled it. take a larger drill the size off the head of the ***** and then just 1 mm at the same smaller hole
so the screws would sink in.
 
DSCN2383
DSCN2384
 
after that i took a look if it fitted the back of the telescope
 
DSCN2386
DSCN2387
DSCN2388

 

So the i took a dc charger, looked if the power supply was good enough and made a new connection

 

DSCN2398
DSCN2400

 

 

It worked!!!!

so the last step was putting it on the scope

 

DSCN2399

 

It runs smood, no sound no vibration.

now i only have to used something to secure it to the back off the telescope.

I will show u my finished cooling fan, hope u liked this!!!!

 

 

 

 


My setup:  Sky-Watcher 200 pds, Sky-Watcher NEQ6 PRO, Canon 40D Full Spectrum, A.P.T Software, Synguider, Photoshop CS6, Deepskystacker

 

:P That`s all folks

wish all of u clean skies :D


#3 Andromeda

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Posted 26 September 2013 - 08:40 PM

Wow Wouter,

That is a lot of work to build such a cooling fan!

Will

#4 astrodoc71

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Posted 27 September 2013 - 10:25 AM

Hi Wouter,

Wonderful job! Could you post this in the D.I.Y. section under "telescopes" perhaps? That would be great! Also that looks like a very big fan. Where do you get something like that and another question for the DIY experts would be how do you know how large the fan has to be or does it matter? Some of these high end scopes have what I would think are tiny fans relative to the size of the OTA and I always wondered how that spec is determined.

Thanks for posting!

Regards

Dave


daveandtelescope.wordpress.com


#5 wouter84

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Posted 27 September 2013 - 10:37 AM

Thnx

 

How do you mean where u can get this?

The materials you can buy alsmost everywhere...

 

About the fan, I saw the same thing, small fan of 92 mm,

I share the same opnion, why such a small fan for a big telescope????

 

So there was no science to it, i thought let`s use a big one of 120mm....

In my opnion the bigger the fan, the less power it needs, the less vibriation u get.

It`s a 12 volt fan, but runs in this setup at 9,5 volts.

 

Hope i made it somewhat clearer....


My setup:  Sky-Watcher 200 pds, Sky-Watcher NEQ6 PRO, Canon 40D Full Spectrum, A.P.T Software, Synguider, Photoshop CS6, Deepskystacker

 

:P That`s all folks

wish all of u clean skies :D


#6 wouter84

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Posted 27 September 2013 - 10:38 AM

another question from me, how do i place it in the D.I.Y section? or should i make a copy?


My setup:  Sky-Watcher 200 pds, Sky-Watcher NEQ6 PRO, Canon 40D Full Spectrum, A.P.T Software, Synguider, Photoshop CS6, Deepskystacker

 

:P That`s all folks

wish all of u clean skies :D


#7 astrodoc71

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Posted 28 September 2013 - 12:23 AM

Just copy it. That should be fine. Those who are looking in the DIY section for info on different projects will find it more easily

Thank you!


Edited by astrodoc71, 28 September 2013 - 12:24 AM.

daveandtelescope.wordpress.com


#8 wouter84

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Posted 28 September 2013 - 09:09 AM

The end of the story is posted in DIY under telescope building a cooling fan.


My setup:  Sky-Watcher 200 pds, Sky-Watcher NEQ6 PRO, Canon 40D Full Spectrum, A.P.T Software, Synguider, Photoshop CS6, Deepskystacker

 

:P That`s all folks

wish all of u clean skies :D





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