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Chriske

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About Chriske

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    Nebula

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  • Location
    BE
  1. Kutter 2" f/28.2 (finished)

    Rainy days during open door, but now and then a few large gaps in the clouds. So from time to time we could observe the sun. There were a few smaller sunspots. Two smaller errors has to be dealt with, the tracking speed was not 100% correct and there was some play in the worm/wormwheel system.
  2. Kutter 2" f/28.2 (finished)

    It does, I already observed a few sunspots with this Kutter. Collimation is done with a powerfull green laser, fine'tuning' still to be done.
  3. Kutter 2" f/28.2 (finished)

    Expect for collimation and also checking on tracking speed this little guy is completely done. For the moment there's no coating on the (3)optics. Purpose is to observe the sun during open door at our observatory. I think we'll not going to observe at all, weather forecast is not promising at all for the next few days.
  4. Kutter 2" f/28.2 (finished)

    I was a teacher in a (technical) school in Belgium. I teached my boys all about lathes, milling,....and also Inventor. My pupils made Stirling engines(working models). During open door (in our school) these Stirling engines ran on a 40 yard long track. The stirling engine locomotive in the movie is a two cylinder. To make a long storie short, Stirling engines run on hot air. So there is no combustion involved at all. I had lots of fun, it was not work at all, it was more like a hobby, loved it..!
  5. Kutter 2" f/28.2 (finished)

    I do have a lathe and a mill indeed. A specific worm/wheel combination is not something I can choose freely. Depending on the diameter of the wormwheel and the tap I get a certain amount of teeth. I do not know exactly in advance how many teeth I'll end up with. To give an example using a 50mm diameter wheel, cutting with a M8 on that diameter I get a reduction around 140:1. Using a M6 tap I get 156:1 Using again a M8 and I reduce the diameter to 45mm I get 113:1 - for diameter 40 I get 100 teeth and I also tested on a 35mm diameter disk and I got 88 teeth. There's something else, something I discussed earlier with PeterDrew and ZiggyNZ a few posts higher up. I said that there's no issue at all cutting a wormwheel. After one rotation the teeth are in sync I claimed. Well, that's not always the case I discovered a few days ago. I was testing cutting teeth on different diameters and suddenly the tap started 'eating' all teeth away. I was left with a wormwheel with something that looked like barbed wire instead of teeth. So, just to see what would happen, I continued pushing the tap toward the wheel. And yes while cutting even further, the wheel started to clean itself up and a completely new set of teeth appeared on the smaller diameter. So you see each diameter has its own number of teeth.
  6. D-Bot 3D Printer

    Did it to, good work..!
  7. DIY 1.25" Coma Corrector

    What..!!! Are they still charging for magazines that old...??
  8. Kutter 2" f/28.2 (finished)

    Electronics completely done now, 3 possible main speeds. This is all Guy's work(our electronics Guru). He always completely make it himself. And I mean all of it, even the PCB,s for the drive, for the remote. Programming the Ic's for the different speeds is done by a simple push on just one button. Maybe overkill I know, but he even added solar speed... I use three batteries in series from my Makita powerdrills. I have a bunch of these 7.2V powerpacks so why not use them for astronomical purposes to...? The holder for these batteries I designed and printed myself. Three of these Makita powerpacks in series gives me about 22V. I use this LM2596 DC-DC convertor to step down to 12V to power up Guy's stepper controller, but also to power the fan.
  9. Kutter 2" f/28.2 (finished)

    Just do it...! Using Inventor is lots of fun. There are only a few programs that can design parts and especially assemblies at this level, Inventor is one of them. I'm a lucky b*****d owning a legal version of this software(from my last employer). If you are a student you can download it from Autodesk.. Im' 100% sure you are a student..!!!... The printer I use is own design, designed in....Inventor...;-)) One of the most important features of my selfmade printers is the ability to swap hotends in a few seconds. So far I have a set of 6 hotends with nozzles starting from 0.4 to 0.9 mm. Next step is to make hotends with 1.0 and 1.2 mm nozzles. Need more info about Kutters..? These telescopes are superior instruments for observing the Moon, Sun and planets. If you're a 'deep-sky-man', forget about these.
  10. Kutter 2" f/28.2 (finished)

    Just had 'firstlight' with this little scope. I have three reflecting surfaces and no coatings yet, so I could safely observe the sun without filter. Pity I had to hand held the eyepiece. Made a very small error during drawing in Inventor so during observing I had to remove (partly) the focuser and push the eyepiece by a few mm deeper as expected. BUT..! This little guy delivers .! I just observed a few sunspots in full detail(even using a handheld eyepiece) I had the impression I could see(for a second or so) detail in the penumbra. Still no contrast yet, because of : no baffles yet, no internal blackening yet, and most of all no proper collimation. This first observingsession was just to find out whether the eyepieces were at the correct spot and there was enough travel. A few specs : Telescope type : Brachyt anastimatic (Often called Kutter telescope). Diameter primary mirror 50mm (sec -convex- mirror diam. 26mm) Telescope FL : 1440mm f/28.2 Magn. Erfle 28mm : 51x (AFOV : 65° - TFOV : 1.2°)
  11. Kutter 2" f/28.2 (finished)

    Using a diamond coringbit I drilled out a 25mm diameter secondary mirror for this scope. It took me just under 4 min to drill the full 16mm thick glass disk.(scroll down to see (short)movie link) 25mm coring bit.mpg
  12. Kutter 2" f/28.2 (finished)

    Meanwhile electronics and stepper up and running. That's all done by our electronics guru Guy. Still remote for the speed-control to be made. Connection is not wireless but through UTP. Two major tracking speeds will be involved, Moon speed and stellar speed.
  13. Printsonian 10" f/6

    Not yet Dave, still busy working on this project that absorbs all of my time. It has to be ready for our open door 9/9. No worries I will post them after our open door weekend, first thing.
  14. Kutter 2" f/28.2 (finished)

    Polishing the optics using pitch. Preliminary polishing is already done using polishing pads. This last session using pitch is just to remove the last irregularities like microrippel, small zones...
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