I have rec some thermal glue thanks to Wombat (Darren)
and have stripped away the existing sticky pad and then use the thermal glue to attach to the mirror.
I then cut a 2" piece of styrofoam about 10mm wide and 10mm thick with a slot for the actual sensor. This went over the sensor and glued into place.
I have measured the fan and will now look for a 56mm holesaw to start cutting a hole for sucking the air out. A few vent holes will help as well.
But first things first, another experiment tonight to see if the sensor is more accurately recording the mirror with hopefully the effects of the surrounding air temp in the tube having been reduced!!!
Good stuff Dave...another R&D project...have you thought about mounting in a way not to have vibes interfering?...any intensions of using variable speed on the fan?
Davo, you have done 4187 alterations to your 10" Dob, motorised, electrified and computerised everything, and you are still going. What are you going to do with this highly modified Robotic 10" when you buy the new 16" in March?
Good stuff Dave...another R&D project...have you thought about mounting in a way not to have vibes interfering?...any intensions of using variable speed on the fan?
vibes as in walking near it etc???
the dob buggy has pneumatic tyres whic would dampened any vibes i would think and yes some sort of computer controlled variable resistor can vary.
not sure in this one, birds system is on or off from memory. once the temp has stabilised, and mirror needs to quickly reach ambient and switch off the exhaust fan.
tonight is very overcast and threatening thunder. it seems to have reached a steady temp, so it will be intersting to see how long it takes mirror to catch up. no fan tonight. plan is to cut holes tomorrow and then redo experiment with exhaust fan.
Nope, from the fan, I mounted my fan using 2 soft rubber grommets on each bolt to stop vibrations while the fans running, but I suppose you can turn the fans off while imaging if need be.
Guys, I turn off all fans etc before I start imaging. Maybe it's just my dodgy-brothers workmanship but I can see vibration from these fans in the image, no matter how carefully I attach the fans.
I don't get any Vibrations from my fan (even at 6.5mm) and some nights I leave it running all night whilst viewing to keep dew away from the mirrors.
Just lucky I guess.
I must say I never noticed visible vibration from my fan when I used to use it. Mounted it behind the mirror with rubber 'O' rings stretched between the fan & the 3 collimation bolts sticking out. The only thing noticable was the rotating mass of air in the OTA as it was drawn down the tube.......or up the tube, which ever way you hooked up the fan. Having it on while viewing was useless.
And that's where having a variable speed comes in handy, finding a speed where you can still view but keeps the fan ticking over to kill the dew and keep the mirror cooling.
Might be a dumb question (typical from me) but when I build my Observatory, will it make much of a difference to viewing or imaging if I have a heater on in the observatory. In winter I want to keep my fingy's & toesy's warm.
