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!!!
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.
After that i toke the fan and marked it on the plastic
Then i used a sharp knife to make an incision and broke it in halve
After that i used a metal saw and made the curves
then i saw the edges were the bolb are for the primaire mirror.
So then came the problem of the inner circle, i used a small drill and made holes across the lines
Then i took a big drill and made a hole for my saw
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
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.
after that i took a look if it fitted the back of the telescope
So the i took a dc charger, looked if the power supply was good enough and made a new connection
so the last step was putting it on the scope
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
That`s all folks
wish all of u clean skies