Here is a Samsung Galaxy III pic from the other day.
Here's the Flintstone looking star tracker I made up. I made up a drive motor by coupling up two gear heads from a couple of those wimpy 'hang on the wall' Black and Decker electric screw drivers. They have a double planetary gear set inside the head. They run a little over 130 RPM as I recall.
I bought a second B&D screw driver and cut the heads off of both drivers at the proper locations using a Dremel tool and coupled them together. Now I had a screwdriver with 4 sets of planetary gear sets instead of two, and I ended up reducing the speed from 130RPM down to about 4RPM. It was so powerful at this point I could have used it to tighten lug nuts.
I was getting close, but I needed to get closer to 2 RPM to drive the other gearhead that I had mounted onto the telescope tripod.
........... this other gearhead was from another cordless B&D 1/4 inch drill that I had laying around. I kept that dead drill because I knew it would come in handy ...........some day.
OK, to get the motor speed from 4RPM to 2RPM, I needed something to reduce the battery from 6 volts down to a lower level and it had to be variable. I made up a speed controller with two potentiometers and two LEDs, an on-off switch, plus a switch to reverse the motor to reset the camera platform to it's original position once I made a photo or two.
I used a volt meter to help me maintain the motor speed.......... these motors are not very high tech and they gradually speed up or slow down. The volt meter helped my keep the speed steady.
A star tracking device needs to have a rotating mount that is aligned with or pointed at the north star. (Jon, this won't work for you)
To accurately aim the rotating shaft at the north star, I bought a used rifle scope. I drilled a hole in the center of it and installed a red LED in the hole to light up the cross hairs with a soft red glow......... Cross hairs are black, and I needed to see them so I could point the scope at the north star.
To keep the motor from vibrating the telescope tripod while taking a long time exposure, I separated the motor from the tripod with a flex shaft. I used a camera tripod to hold the motor. The other tripod you see is an old wooden telescope tripod.
This was a lengthy process to figure out how to make this contraption become usable and accurate. I wanted a good photo of the upcoming comet Hale Bopp comet and this was why I spent so much time messing with this.
It was a real PITA set up and use, but It gave me one of the most rewarding images I have ever taken............... a 16 minute long exposure of Hale Bopp using my 300mm lens.
Here's the contraption almost set up, a photo of where I did my first real test with it and my first image of the comet.
The image was a total fail, but the comet was still far away. Fortunately the comet was getting much closer over the next couple of months which gave me time to work the bugs out of the system so I could nail that sucker.
Here is a Samsung Galaxy III pic from the other day.
Me too, Rusty. It was pretty sweet looking back then...... '97. The paint was already 7 or 8 years old in that photo. While I had the engine out when I was doing a rebuild, I hit under the hood with hot water through a pressure washer and painted the firewall inner fenders an everything under the hood with acid based primer, then gloss black like the truck.I like the pictures, but I like that truck even more.
Holy cow. That's a crazy contraption.
Great photos W .
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