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Chriske

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About Chriske

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  1. Gina, What I'd do with all these pictures : making a time-laps covering a year long movements of the stars. Not a minute long or so, but stretched over 10 minutes or so, even longer.
  2. Testing...on a spare tube. Mounting the brackets for the landing feet. Not 100% ok, need to redo this.
  3. Holding me back....????? I only began...
  4. Well no, I did it the easy way... Did you know btw that all printers can print bulged surfaces. All you need is the required software.
  5. I gave it away by talking about that cup of tea...dam... That is not far from the truth indeed. I used a heat-gun and the 'rocket' itself to push that part against it. If I go gently I can even bulge the centre part, as is with the real thing.
  6. View from another angle. How is this possible, what happened..? And at the same time while posting this, I notice my cuppa is getting cold...
  7. Did some printing myself too today. Question for the print-nerds.. What is the difference between these two part, beside the used nozzle diameter.? What happened..? Both parts started from the same STL file.
  8. My pal Michel is also printing parts for this project He's busy printing thrusters. 8 of those are needed.
  9. Thanks Neil..! Would you also share the source file..?
  10. I'm @ 51.8' so that is a design I could use... Do you share that file..?
  11. Hi, We did a similar thing years ago. We installed a Nema17 stepper above the secondary mirror of a CAS The stepper and mirror were surrounded by 6 very small ball bearings. Focusing was done with a M3 threaded rod. There's a problem focusing with a CAS secondary mirror. Moving that secondary mirror is very tricky. Alignment of that mirror was no problem in our case, because of these 6 ball bearings. Biggest problem is the the threaded rod itself. Most of these commercial threaded rod are not 'regular' enough at all. And that is not all : we discovered that over a certain length the threads of two different rods differ. One time we did a test with a M6 threaded rod of two different sources. Over the length of 1 meter the treads of these rods differ 1.2mm(!!!!!) What do I mean with 'not regular'. Well we tested a M3 rod for that secondary mirror focuser. We installed a dial gauge aside the unit. The test was to see if for every single and precise rotation of that rod the mirror would move each time the same distance up or down. Needles to say all was springloaded and test were done very thorough. Well, no the distance for one single rotation of that M3 threaded rod did differ sometimes 0.02/0.03 mm. So we never proceeded with that project. The only way to overcome this problem is cut your own threads. most commercial threaded rods are 'rolled'(not cut) at very high speed. For one threaded rod 1 meter long it takes about two seconds to finish. Now that I come to think of it maybe, just maybe you also have 'bad' rods -of different locations-..?
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