Archive for April 2018

Primary Mirror Linear Bearings

There has been progress with the second round of focuser prints, but I’m going to take a moment to sidetrack to the primary mirror linear bearings. This is for adjustment of primary mirrors to make sure the images merge into one stereo picture rather than two side-by-side. Up to this point, I’ve been planning to…

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Custom 1.25″ Parfocal Ring Prototype

It’s hard to wait for 3d prints in the mail, so in the meantime, I designed two different parfocal rings. The first is a fixed-height ring that uses grub screws the same as the existing products on the market. 3d printing these is still cheaper than purchasing retail. The second is a little more radical:…

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Focuser Modifications

I was able to brute force the screws through the too-small holes in the drive plate, so the focuser came together for testing. Looks like we’ll call this one v0.1 as 0.5 was a little optimistic: So far, it only works with a gravity assist, which I believe means the drive plate in standard Onyx…

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Almost Forgot – 1.25″ Eyepiece Adapter

Ok, this isn’t strictly a case of “forgetting” to design somethign–I’d planned to just buy 2″ to 1.25″ eyepiece adapters ready-made. But since I’m becoming more comfortable with rolling my own parts, I thought let’s design it and see how much it costs to print. Turns out these will cost less than $8 to print.…

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Focuser Updates

Updates have been made to the focuser based on the 3d prints. One unexpected change is the possibility of doing away with the bearing axles entirely. I placed the bearings in their slots on the drive block print, and even with tight tolerances they spin very freely when placed directly against the Onyx surface. I…

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