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About Chriske

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  1. 3D Printer Nozzle Wear

    Length 270mm(about 11") Weight : 900gr(about 2lbs) Cylinders : 31cc
  2. 3D Printer Nozzle Wear

    This one is the most powerfull I made so far. A 2-cilinder Stirling engine. In the movie it runs at about 1000rpm but after some additional tuning it got as fast as 1250rpm.
  3. 3D Printer Nozzle Wear

    What about Stirling engines Gina... Not interested...?
  4. 3D Printer Nozzle Wear

    Woow...!! steam engines...I'm drooling all over my laptop.... I myself made some Stirling Engines.(own design)
  5. 3D Printer Nozzle Wear

    As a matter of fact I haven't changed any nozzle at all during my 4 years printing adventure. And I do print lots of stuff every single day. Stub Mandrel, compared to the one on the left, the nozzle's diameter one on the right has enlarged by at least 10%, maybe more. So you could keep on printing with that enlarged one, only you have to change settings in your slicer. Try set it to 'nozzle diameter 0.5' or '0.55'(even higher) and see what happens. Your print quality should improve drastically when you set it to the 'renewed' nozzle diameter. And as mentioned before by the other posters, solve that leaking problem.
  6. 3D Printer Nozzle Wear

    yep, me to....
  7. Project : HNU-75 - Moon watcher

    Next step : hogging out three 10" mirrors. Each mirror's back serves as tool for another mirror. When all mirrors are done I have no tool left, so no waste of material. Doing so I will end up with three meniscus shaped mirrors.
  8. Project : HNU-75 - Moon watcher

    First thing to do is flatten all these old tools. I made myself a little wooden device containing an angle-grinder with a diamond disk. It takes me just a few minutes to flatten one tool. https://youtu.be/atqwnxBUOe8
  9. Kutter 2" f/28.2 (finished)

    Lots of fun...? Absolutely...! I have a few friends helping me out with a few things I would not be able to do. Especially the electronics, it is all done by my pal Guy. He's a real wizard. It's a very pleasant co-work. He's also the man behind the coatings of all our mirrors. In the pictures he's preparing to coat 2 sets of 50mm(2") Kutters and one set of 150mm(6") Kutter
  10. Kutter 2" f/28.2 (finished)

    After a few adjustments this scope performs very well indeed. Observing the Moon was really fun. This scope delivers stunning sharp images. Very high contrast to, that was to be expected because this type of telescope is known for it's very high contrast performance. At 50x(Erfle) it was a real feast for the eye. I have a 4.7 Nagler and tried it on this little scope as well(of course), and it was not that bad at all. I know, I know, enlarging 300x on a 50mm scope is way over the edge, but I was pleased with it nevertheless. Next step is to build a few larger Kutters. Just started a course for advanced ATM at our observatory. A few of the pupils will build Kutters up to 6".
  11. Every year in our local observatory Urania (Hove - Belgium) new courses starts. One of them is a 'basic astronomy' course for 12 to 15 year old. Most of these kids have no telescope(yet). So I thought why not build these kids' at the end of that course a very basic scope, say kind of a 'Moon-watcher'. If they're really interested in astronomy they can always buy a larger scope later on. They idea is to build these kids a very basic scope each and sell it at a very low price. Busy designing this HNU-75 this very moment. HNU-75 stands for Hershel-Newtonian-Urania, its primary mirrors diameter is 75mm(3"). Urania is rather obvious, Herschel : because I didn't want a secondary mirror in the lightpad, and Newtonian because there is actually a secondary mirror involved after all, but that secondary mirror is located at the opposite side of the focuser but outside the 'tube'. So during observing you have the 'Newton telescope feel' but no obstruction. Focal length 1400mm(55"), so f/18. Why that rather long FL, well I ran a Hershel-system through WinSpot(basic Raytrace) and the only acceptable combination to end up with a diffraction limited Herschelian was f/18. Advantage of this longer telescope is a somewhat larger primary image, so ideal for Moon, planets and also globular clusters. The last 35 years I've organized telescope making courses at our observatory. Every year new members made telescopes up to 300mm(12"). At the end of each course I was left with a pile of tools, nobody wanted to take it's tool at home. So I have literal tons of glass disks waiting to be used, collecting dust. The idea is to reuse these disk and make primary mirrors out of them for these little scopes. Out of 1 single 10" mirror I can core out seven 3" mirrors. Saves me lots of work. Aluminizing and coating is no problem at all because I have my own coater(up to 24"). Our observatory will pay half of the price of these scopes. So the pupils parents are left with (about) 25€ to pay for their scope. I think that's a fair price for this 'telescope on a stick'. Included are 2 Kelner eyepieces, dob mount, laser to collimate the scope and a LED-finderscope. Almost all parts will be 3D-printed, saves me LOTS of work(again). This is how these scopes will look like. Focuser and Dob-mount still to be drawn.
  12. Homemade DIY Binoviewer.

  13. Homemade DIY Binoviewer.

    This device is(was) used in a microscope, regular astronomical eyepieces will not fit in this viewer if I'm not mistaken.
  14. 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.