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About kbrown

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  1. kbrown

    Cheap UV/IR cut filter for my guider scope

    Awesome. I'll drop it in the mail tomorrow. Keep us posted how it goes. Thanks, Kari
  2. kbrown

    Cheap UV/IR cut filter for my guider scope

    I modified the design slightly based on my own experiences using it. It's now slightly smaller and lighter and the threads for the locking screw are a bit beefier. The fit is pretty good anyway so using the locking screw is optional. The thread for the filter is much better fit now as well. I've made an ebay listing of this in case more people would like a copy. Hope it's ok to link here: https://www.ebay.co.uk/itm/332725135852
  3. kbrown

    Cheap UV/IR cut filter for my guider scope

    Yes it is indeed a standard SW finder. I can definitely print you a copy for a small compensation however I'd like to refine the fit a bit better before doing so. The adapter in the photo is a bit too tight fit for my liking and the cap is a little loose (I added some flocking material inside as a quick fix). If I can get these a bit better then I'm happy to print you a copy too. Sound good?
  4. kbrown

    Cheap UV/IR cut filter for my guider scope

    Interesting idea. I have an IR pass filter. Might try that too.
  5. I wanted to improve the quality of the images from my mono guider camera so I decided to add a UV/IR cut filter to the optical train. Having had a look what's available and at what price I decided to go DIY route and got myself a M52 filter meant for camera lenses and print a suitable adapter for it. The filter was a whopping £6.16 delivered from ebay. The adapter and the lens cap for the whole thing took a while to design and print but I think it was worth it.
  6. Sorry to barge into this thread (have to admit I didn't read it all). I'm curious which actual sensors are you guys using that can talk to an Arduino? I'm interested in writing an INDI driver.
  7. FreeCAD can also be programmed using python either by directly from the python panel or as a macro. You can even build your own UIs with Qt if you want. Haven't done much with it yet but I've seen some pretty clever examples.
  8. kbrown

    Where to get optics for a refractor?

    Thanks Peter. Something along the lines: doublet 70-80mm F/5-6 to keep the size and weight down.
  9. kbrown

    Where to get optics for a refractor?

    No worries. I'm enjoying it :D
  10. Hi, I'm toying around with the a idea to design and build a small simple refractor telescope. I have to admit I don't know much about them so I'd probably use commercially available optics. Where could I source these from? Preferably in the UK? Thanks, Kari
  11. I mainly use FreeCAD. I does take a couple of nights of youtubeing to get into but once you get into it, it's great. A good companion to it is LibreCAD which is an old school autocad style 2D only CAD. Sometimes it's easier to do your 2D drafts in it then take it into FreeCAD (via dxf) for further processing. Blender is another free option but personally I don't like it much. You can also get a free version of Side FX's Houdini called Houdini Apprentice. It is a very powerful package but not your typical CAD software though. It can however output STLs. All of the above run natively under Linux.
  12. kbrown

    M42 to 1.25" adapter

    Oh by the way. What are you guys using to model the threads? I did mine manually in FreeCad by sweeping a thread profile along a helix then some booleans on top. Getting the profile right proved to be slightly tricky but I guess you only have to do it once per pitch.
  13. kbrown

    M42 to 1.25" adapter

    I've just received 0.25mm and 0.15mm nozzles. Ordered them as I wasn't able to get clean prints at 0.05mm layer height with the 0.4mm nozzle. Also the hole diameters were not accurate. With the 0.25mm nozzle everything seems to click. Here's a couple of M12 internal threads. The 1.75mm pitch was printed with 0.1mm layer height and the 0.75mm pitch with 0.05mm layer height. Pleased with the results. Have not tried the 0.15mm nozzle yet.
  14. kbrown

    M42 to 1.25" adapter

    Oh wow. What layer height did you use? I'll definitely try that...
  15. kbrown

    M42 to 1.25" adapter

    I milled it afterwards on my CNC router with a thread cutting bit.

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