Ex Oriente, astrum ---------------------- From the day you are born 'til you ride in a hearse, There's nothing so bad that it couldn't be worse!
8" Criterion Dynamax 6" Homebuilt F/10 Newt 6" F/8 Jaegers 127mm F/5.5 SS Assembly Various 60 mm scopes in many states of repair 8' Dome Observitory
Quote:I appreciate that you have been working on this for a while now and I'm a Johnny-Come-Lately to the conversation but, any chance you could dig down a couple of feet below grade to install the lower part of the observatory? You would have a structure that was almost full height but still below the fence.
Quote:That will work! I was just concerned that perhaps you hadn't thought to the next step It's looking good!
Quote:So the gores are only held down at three points along their length? (top bottom and central bolt)
Quote:thanks, then you could I assume have done away with the ribs. I am skinning mine with aluminium sheeting which gets nailed/screwed down onto 1 inch thick ribs.
I lost count of my scopes. Now I just want mobility. I came, I saw, I bought some interesting accessories, and put names to faces: NEAF 2012, ASAE 2012, SWAP 2013, ASAE 2013.
Quote:I am using a PWM output to allow the dome power to be applied and removed smoothly.
Quote:The other thing is that I an using an electronic compass module to get the dome position, a Sparkfun breakout board. This is bolted to the dome. It should be easy to fit this to your dome Arduino running it off the 3V3 supply and the I2C data lines.
Quote:The MOSFET was OK for a while but once I got more ambitious about PWM motor speed control it failed within an hour or two. No idea why.
Quote:One thing you will find with PWM control is that you will have a singing dome. The B flat two octaves above middle C I think
DreamCatcher Dobservatory/AstroTech 16" dob.
Quote:I got the high power motor driver, this onehttp://www.pololu.com/catalog/product/758it may be overkill but I was fed up with killing mosfets.
Quote:I didn't need the USB input as I was connecting to the existing Arduino using the existing code and ports.
Quote:It will be interesting if the XBee can be connected to through the serial port on the board.
Quote:Well done ! I have divided my slit into 5 portions. 1 part fold down flap, 2 parts sliding shutter, 2 parts fixed at the back.
Quote:How strong did you find working with the pocket hole jigs? I notice pocket holes in the ribs to bottom ring joints. Did you use the same idea to fix the ribs to the two main central arches forming the slit?
Quote:What do you estimate the cost of the dome to be?How much does it weigh?
Quote:Was considering doing something similar but a smaller dome and came across this maker of Plastic Domes .