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8" mount v1 complete!
After several days of designing, 3D printing, and experiencing the joys of my favorite telescope related activity, hacksawing through metal, I managed to assemble a complete mount! Design-wise, I had to replace 0.5" screws with 0.75" screws in a few places because the redesigned EMT tubes were too close together. The telescope uses only 0.5" screws, so it would have been nice to match, but it’s fine for an one-off.
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I did a tiny bit more parabolizing, then re-measured my mirror. Last time, my spreadsheet and measurements told me my outer zone needed to focus tiny bit farther and my lower zone needed to be a tiny bit closer. To dig the inner zone out, I did some W strokes with lots of mirror movement on the tool edge, and then used long center over center strokes with a tiny offset to dig everywhere but a tiny strip of outside.
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Unable to find image image2_1.jpeg Unable to find image image2_1.jpeg I did a tiny bit more parabolizing, then re-measured my mirror. Last time, my spreadsheet and measurements told me my outer zone needed to focus tiny bit farther and my lower zone needed to be a tiny bit closer. To dig the inner zone out, I did some W strokes with lots of mirror movement on the tool edge, and then used long center over center strokes with a tiny offset to dig everywhere but a tiny strip of outside.
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I got the news from my local glass studio in an all-caps email that said nothing but “IT WORKED!”
Look at this! My glass is now clearly curved, around 1/4" taller at the sides than at the center! That’s very close to f/4, my goal! SLUMPING DRAPING: SUCCESS
Weirdly, even though the mirror is the right shape, the cement form seems to have warped. The top face is now flat, and the bottom is now curved - which is weird because originally the bottom was flat and the top was curved.
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Introducing “Finley”, probably the jankiest and most colorful eclipse imaging setup of all time. The only telescope I have which is enclosed (and therefore safe to use on the sun) is this donated finderscope, meaning I’ll have crosshairs in all my images. I’m taking pictures using my friend’s phone which he gave to me after the screen cracked. I designed a 3D printed adapter so it fits on the sturdy 3D printed mount I designed for the far bigger Hadley telescope.
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A quick moon pic from my 3D printed telescope and phone cam. Some out of focus tree branches snuck into the top and traced some faint dark lines!
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I have many projects in mind for telescope upgrades. Since the last list I’ve completed one and added one. Here’s what I want to do this year telescope wise:
#1: Sliced Pifinder (complete!) Complete! I built a Pifinder for 1/5 of the list price by using a different cheaper camera, secondhand older pi and battery pack, and printing and soldering parts myself. It’s been very helpful when it works, and let me take pictures of M33 even without seeing it!
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I drove out to what Google maps said was a park and then saw a sign saying “state property no trespassing” and a second sign saying “don’t steal road salt or gravel from here, if we catch you you’ll be prosecuted”. I guess that’s what some silly rural fellows get up to in their free time? So I parked right in front of the entrance off the side of the road, since it was pretty dark.
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