iceman
03-05-2006, 06:41 AM
Ok, i've seen Matt's thread, I've read previous threads by DP and seen Bird's site..
Just trying to pull it all together in my brain.
The easy solution is just to mount the fan on the back of the mirror cell, but obviously that's not ideal. My eventual goal is to go to active cooling, so I want to take the steps to get me there, without doing it all at once.
So, without including Peltier's into the design right now, what's the best way to attach my fan to the bum end of my scope?
Design factors:
1) Is one big (9cm) fan enough? Would I be better with 3 small fans (as bird has (http://www.acquerra.com.au/astro/cooling/version3/))?
2) These fans (or this fan) needs to be blowing onto the mirror
3) The mounting plate should be aluminium
4) The mounting plate should close in the end of the tube (ie: the size of it should be the outer diameter of the tube?)
5) Cut a hole in the mounting plate for the fan to blow through
6) How do I attach the fan to the mounting plate? Just using 4 long screws? (my fan didn't come with any mounting screws)
7) How do I attach the mounting plate to the scope or mirror cell?
8) It needs to be able to be removed easily, for when the mirror needs to come out for cleaning
9) Need to be able to reach the collimation screws, so I guess 3 holes need to be cut in it so I can reach the collimation screws. Will this affect the desire to "close in" the end of the tube?
For active cooling (later on), it appears I need a couple of peltiers, an insulating perspex sheet (or polystyrene), another aluminium plate, some heat sinks and some more fans. Is that about right?
Thanks for any advice, and remember a picture is worth a thousand words :)
Just trying to pull it all together in my brain.
The easy solution is just to mount the fan on the back of the mirror cell, but obviously that's not ideal. My eventual goal is to go to active cooling, so I want to take the steps to get me there, without doing it all at once.
So, without including Peltier's into the design right now, what's the best way to attach my fan to the bum end of my scope?
Design factors:
1) Is one big (9cm) fan enough? Would I be better with 3 small fans (as bird has (http://www.acquerra.com.au/astro/cooling/version3/))?
2) These fans (or this fan) needs to be blowing onto the mirror
3) The mounting plate should be aluminium
4) The mounting plate should close in the end of the tube (ie: the size of it should be the outer diameter of the tube?)
5) Cut a hole in the mounting plate for the fan to blow through
6) How do I attach the fan to the mounting plate? Just using 4 long screws? (my fan didn't come with any mounting screws)
7) How do I attach the mounting plate to the scope or mirror cell?
8) It needs to be able to be removed easily, for when the mirror needs to come out for cleaning
9) Need to be able to reach the collimation screws, so I guess 3 holes need to be cut in it so I can reach the collimation screws. Will this affect the desire to "close in" the end of the tube?
For active cooling (later on), it appears I need a couple of peltiers, an insulating perspex sheet (or polystyrene), another aluminium plate, some heat sinks and some more fans. Is that about right?
Thanks for any advice, and remember a picture is worth a thousand words :)