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Everything posted by starman345

  1. This is interesting. I'm not sure I understand completely, maybe a picture of the unit with the threaded rod installed will be more clear. I hope you will show your build progress here.
  2. Looks great Jim, lots of progress. I wish I had your woodworking skills.
  3. Wow, looks great Francois. Lots of cutout work to save weight, did you do all that by hand with router or on a CNC machine? Can't wait to see the finished product.
  4. Quite if a bit of chatter about night vision goggles and night vision monoculars on another forum. They are pricey but according to some an excellent way to observe. Lots of Night vision videos on YouTube.....search "night vision astronomy".
  5. Hi John, I've enjoyed your journey through the build, and appreciate you documenting it here, lots to learn for all of us. Just a note to try and save you some headaches...I too built a scope using the K&B book as a guide and also found my secondary was too low according to their method. After much cursing, and head scratching I posted here for help and well, you can read it yourself. There is also another thread here that might be of some interest. Sorry to hear about your mirror mishap, that is discouraging but hopefully the views won't be affected.
  6. Thanks for the video and update Pete, I enjoyed watching and reading.
  7. Beautiful telescope coming together there! Thanks for all those pictures, it looks like you have a lot of experience judging from the workmanship. I am envious of your workshop and all those neat tools.
  8. Great stuff Simon! I'm envious of that John Nichol mirror, did you settle on a secondary mirror size yet?
  9. Rick, I can't imagine pushing that 20" lap, I find my 10" hard enough. Just curious, you didn't mention warm pressing after the lap was channeled, I found I had to do that to get in good contact, maybe my pitch is harder or my work room is cooler. If I ever do another mirror (if i ever get done with this one) I think I might try those polishing pads, it sounds like it gives you quite a head start on polishing.
  10. Crash, don't let it get you down, I'm doing a 10" and I've made and re-made my lap at least 10 times probably closer to 15. I learn something each time I do it. I used a cheap short hand saw to cut channels, I tried with my longer hand saw but it seemed to flex too easily, each time it flexed I would get pitch chip-out. The short saw seems to work much better. I can only make two or three strokes then have to stop, clean the teeth and let the saw cool down or it will clog up and start chipping. Gordon Waite has a great YouTube channel with lots of mirror making videos. This one: shows how he channels his laps. I think he's doing a 15" in that video. You certainly have your hands full with that 22" chunk of glass but I'm sure you can do it. You mentioned John Nichol, he has also helped me, its great you have him to guide you when the going gets tough.
  11. It looks really nice Dave, I like those spider end connectors you built. It looks like you have a natural talent as a builder. Keep the pictures coming, I'll be watching this thread with interest.
  12. Right you are, I was comparing my 3.1 rather than your 3.5", still, I think your holder would suffice, maybe someone with a similar setup will chime in.
  13. I can't help with any measurements but I do have a Protostar 3.1" mirror, holder and spider, I'm assuming you are using the shroud? I just siliconed my 3.1 to the holder, wouldn't that be a cheaper route for you to take? Even with the smaller 2.6" holder I don't think that would be any problem, maybe 1/4" or so of the mirror would be protruding beyond the holder.
  14. Hi David, You can look here https://www.willbell.com/TM/dobtel.htm I do know they ship pretty much worldwide but not sure about cost, something you could check out on their site.
  15. Nigel, I think you hit the nail squarely on the head with that sentence. I am doing my first mirror at the moment, its a 10" pyrex that I would like to finish out to a f 6.4. I haven't seen a mirror made, just going by videos on YouTube( and they can be confusing, everyone seems to have their own particular stroke that they like) I have bought several books on mirror making, including Texereau, Ingalls and a couple of lesser known books. The are full of great information but it seems they all have their own way of doing the job. I read on another forum it might be best to just pick one book and go by that method and forget the rest. I envy you guys who have attended a mirror making seminar, or class
  16. Nice job MIke, a lot of thought went into that I'm sure. Is the spider something you built? Using LP record pieces for base bearings is something I hadn't heard of before, I learn something new every day here! Does the scope balance well?
  17. Hi John, I'm grinding my first mirror, a 10" pyrex mirror, it's about 1.6" thick and I'm going for an f6.5..or so. From what I'm reading it should be simpler to do than a faster mirror. Its a great challenge and I'm having a lot of fun.
  18. I'm pretty sure that would be the Greek letter for micron, does the U have a long tail? I ordered some grit recently and found it confusing as some places have different names for the same thing. Gotgrit has a grit table in their links section that helped me figure it out.
  19. Video would be great Rick, I'd love to see that 47 lb piece of glass. Thanks Nigel for that edge bevel advice, I didn't know that and will be doing it on my grind.
  20. I'm following along with every post Rick, Happy New Year to you and yours!
  21. Hi Rick, Interesting about the Pyrex-glass comparison as far as grinding, I've never tried Pyrex but I may in the near future. You spoke about your wets drying out quickly, I wonder if it is the cold we've had and the low humidity. I fired up the humidifier here this morning for the first time in a few years(-22 C here this morning), the wood stove has been humming along steady for about a week and it really dries things out quickly. Maybe your glass sticking to the newspapers is related too...I use carpet but if you are using wet papers it might be drying out. At 47 lbs that is one big chunk of glass to move around. Good luck on your project, I've already learned quite a few things about grinding from reading your thread. It's really interesting with the pictures and explanations.
  22. Hi Rick, glad to see your project is underway. Sounds like you are having fun. I'll be following along with interest.
  23. Welcome to the forum Tim!
  24. I installed it a few days ago, all went smoothly except Mediaportal no longer worked, they released a patched version yesterday and now it's working again. I like it, it boots to desktop now, but you have to set that yourself. I find it fast and very stable.
  25. Hi Nick, welcome to the forum. That is a nice scope you have on order!
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