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About Astrofriend

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    Star Forming

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    Astronomy, Cars, old stuff
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  1. Hi, Earlier I have made a calculator to find the telescopes depth of focus: http://www.astrofriend.eu/astronomy/astronomy-calculations/depth-of-focus/depth-of-focus.html Now I have continued with a gear ratio calculator for the motor focuser: http://www.astrofriend.eu/astronomy/astronomy-calculations/focus-gearbox-ratio/focus-gearbox-ratio.html Sometimes it could be tricky to find the correct gear ratio and maybe this could be of some help. It's important to have the stepsize about 5 times smaller then the depth of focus. Note: This is all new, I may have done some mistakes, check carefully before ordering any parts! /Lars
  2. Astrofriend

    Astroserver CPU load

    Hi, Thank you for posting your equipment. Maybe some people think that astronomers are odd people, or? /Lars
  3. Astrofriend

    Astroserver CPU load

    Hi MarsG76, Yes I'm satisfied with my computer and what it can do. But there is another issue, to power the computer I need 19 volt. As a power sourche I have a small carbattery that have constant charge, 13.7 Volt and have a DC/DC converter between, 13.7 to 19 volt. Next time I build a new astroserver I will take a PC that can be powered direct from 12 (13.7) Volt. It will reduce the power losses and need less space. I think that some of the Intel NUC mini PC models have that opportunity. It's not a big problem and no hurry to solve. As it now my system can run 4 hours during powergrid loss. /Lars
  4. Astrofriend

    Astroserver CPU load

    Maybe you have plans to build an astroserver to control your equipment. One thing to figure out is how fast computer do you need. Too fast and it take more power then necesary (my computer is battery operated), to slow and it will not work properly. I have made a table over the CPU loads on my Astroserver during different work: http://www.astrofriend.eu/astronomy/tutorials/tutorial-cpu-load/tutorial-cpu-load.html Maybe it could be to some help for you. /Lars
  5. Astrofriend

    Frustrating focuser problem

    Hi, Today I have solved a lot of problems. The problem with the wrong parking position of the focuser must have been caused by the fact that the focuser motor has too low torque now when I have increased the force on the focus axis. Not the temperature compensation which I first thought. Here you can see how I have temporarily solved it with help of a spring: http://www.astrofriend.eu/astronomy/projects/project-focus-friction/page06-project-focus-friction.html Maybe I will have a better solution to it later, but first I must test it out. /Lars
  6. Astrofriend

    Frustrating focuser problem

    Now with four clear skies in a row I could do a lot of test with the "sandpaper fix". It work better then ever, but found another problem, of course. Maybe the temperature compensation. Lars
  7. Astrofriend

    Frustrating focuser problem

    Sorry, I was not clear enough. I use this telescope only for astrophotographing. It already have motor focus. Camera and pheriphals weight about 1.5 kg. But same problem, focuser slip. Especially when doing automatic focus, then the motor move back and fort. If it slips then it will newer find the sweet spot focus. But I think I have solved the problem now. Just need a clear sky to do a test. Please give me that before the summer sets in! Lars
  8. Astrofriend

    Frustrating focuser problem

    Hi, Now I maybe have found a simple and quick fix of my slipping focuser. I have done a simple test if I can increase the friction with just sandpaper glued to the steelplate. It looks to work very well, maybe it will not last forever but then I just glue a new sandpaper on the steelplate. The sandpaper is a replacement for the diamond shape surface. I hope I can do outdoors test in the coming nights. Here is a bit more text and photos what I have done: http://www.astrofriend.eu/astronomy/projects/project-focus-friction/page05-project-focus-friction.html /Lars
  9. Astrofriend

    Astronomical Dictionary

    Hi TsRobot, Yes that astrograph is a gem. There are other instruments there too. One 40" Newton reflector, one twin refractor 20" and 24", one meridian instrument and a couple of smaller instrument. Top of the line in 1930s, Carl Zeiss. Do you have any old observatoies around? Lars
  10. Astrofriend

    DIY Observatory at Malta

    Hi Dave, I'm living at 60 degree latitude, and you? One more month and we almost have summer, but then no observations. Lars
  11. Astrofriend

    Astronomical Dictionary

    Hi Luke, Thanks for the comment. I try to use english on most of my pages, but not very skilled on it. But better now after a couple of years with my homepage when I'm forced to use english. Swedish is very limited when searching answers on internet. We are soon in the summerseason and then we can't do any observations. How about your place? Lars
  12. Astrofriend

    Frustrating focuser problem

    Hi, It's not so easy to change the axis surface. It needs to be of low friction surface because the press friction bearing acts on it at the same place as it press on the steelplate. I have thought about to instal two roller bearing on each side, but it's complicated. Lars
  13. Astrofriend

    Astronomical Dictionary

    Hi, Yes, I use it a lot myself, wikipedialinks with information that I link to is very usefull and of high quality. I have added many more astronomical words since last. Lars
  14. Astrofriend

    DIY Observatory at Malta

    I and my girlfriend has come home from a one week travel at Malta, a small island in the Medeterranien Sea. About a mount before we go I came in contact with an amateur astronomer down there, Maurice. He invited me and my girfriend to visit him and his DIY built observatory. The observatory is built on top of his house and it has a real dome. If you find it interesting to read about it I have done a small report from our visit at the Malta observatory with photos: http://www.astrofriend.eu/astronomy/observatory-sites/malta-maurice-observatory/malta-maurice-observatory.html The Raven and the Owl observatory, Malta. After this visit it's hard to understand why we stay in Sweden where we live, when it's dark it's also very cold. We often have from -20 degrees to 0 degrees Celcius temperatures. Now adays we don't have many clear nights either. /Lars
  15. Clouds and clouds and even more clouds, what is happening with our weather? Good then I have found a new part of the astronomy, scientific data. This is of course a bit outside amateur astronomy, but what to do when we never nowadays have a clear sky? This time I took a look at the Kepler spacecraft and it's data. Normally used to find exoplanets. But that data can also be used to examine variable stars. One big plus, the observatory is out in space, no clouds! One of the more exiting thing I did was to set together 44 months of data as a GIF movie. And by luck there was one very clearly seen variable star: http://www.astrofriend.eu/astronomy/science-data/science-data-kepler.html It was a bit tricky to get this to be correct because the satellite rotate 90 degrees every three months. To read these files I need two new tools which found at NASA homepage. The DS9 Fits reader and Fv reader. The other tools was the ones I normally use, AstroImageJ, Fitswork and IrfanView. In the beginning I also used a hex binary editor, but didn't need it in the end. /Lars

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