Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.
Quote:That sounds pretty nice
-DannyMy warehouseMy Channel
Quote: My prototype mount used standard 1-1/4" pipe tee and 1-1/4" to 3/4" NPT, PVC adapters which are common and available at my local HomeDepot for under $2 each. The 3/4" pipe I used for the shafts is just a few thousand larger in diameter then standard 1" shaft material. Here is a link to the Stellafane website were there are pictures of the scope which should give you some idea of how it works. It's the 4" f/11.5 "Scope on a Stick" http://stellafane.org/convention/2012/2012-scopes.html - Dave
Inventor of the Herschel Wedgie. Watch your back.
Astronomy - The World's Second-Oldest Profession.
"You don't know Swift from Astrola." -C.H.-
Starsplitter 20" Dob
Celestron 11 GPS
AstroZap 152mm Achro
Sears Discovery 80mm Achro
Quote:Now that is a nice looking DIY GEM! I like your belt sander. I'm going to get one some day. What model/make & table size is your band saw?
George RoffeKingwood, TX
Quote:Instead of producing new legs, why not drill a series of holes along the length? Maintain much of the strength and rigidity but still shedding mass.
Quote:Excellent build! A very steady mount for that refractor. I would recommend putting some self adhesive green felt on the OTA clamps to protect the OTA finish. Has always worked for me.Drilling the holes into the legs to lighten the weight is a good idea. I have seen that done in other builds here in ATM as well as in Richard Berry's books.I enjoyed reading your web page blogs, though I nearly cried reading about the iron skillet restoration. The rust must go but Ooooo, the removable of the seasoning layer. It would be like erasing my grandmothers memory (I have her cast iron skillets); all those biscuits, ham, bacon and pinapple up side down cake. I think I'm hunger now.
KJ6RGY Richard Trost
Working on a 12" f4.25 single pole hybrid dob.
Quote:Nice intricate triple lap joint there! What tools did you use to make these?This is one of my favourite threads. Full of ideas to borrow. Thank you for documenting and everyone for piping in on the pipe part.
Quote:I made the new legs for the tripod this morning. They’re the same shape as before but lack the large webs of the solid legs. The previous legs weigh 4lb 2oz while the new ones weigh 2lb 12oz a piece. Total, the tripod is now 4lb 2oz lighter. It still feels very rigid when the spreader is used. I hope to give it a try tonight.
Quote:Do you think the equatorial axis would move freely enough to be motor-driveable? I'm looking at building a mount for my 102 and it would be great if I could do some rudimentary astrophotography experiments with it while I save up for something good. My current designs involve ball bearings but I get the feeling PTFE will probably end up being better on both the cost and workability fronts.
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FWIW, I have used wood and pipe mounts since the 1960's and my primary mount is still the wood and pipe mount that I have iterated since then. I have tried every sensible type of bushing and bushing material in the attempt to get a clock drive to work. Yes, even the PVC and teflon and ebony star etc. I was not successful getting a clock drive to track well until I put a ball bearing on the North polar shaft end. At one point I did get the mount to track before I added the ball bearing, but with the clutch very tight which was a strain on the gears. For best results, the polar shaft must be absolutely frictionless.
Now, I was using a worm and gear type drive with a synchronous motor. Don't know about steppers etc.
Celestron 8SE Dobstuff 13.1": Swayze refigured Coulter mirror, 6 pt mirror cell (2 pt edge support) and CF focuser board made by me StarBlast 4.5 ST80/PortaMount II Zhumell 20x80/Oberwerk 15x70 on a Seronik-style tripod boom mount Hubble Optics 18 inch F/4 mirror.
Quote:Do you think that 3/4" wide, 1/8" thick UHMWhttp://www.mcmaster.com/#8702k22/=oq84z1or 3/4" wide. 1/4" UHMW might serve in place of the Teflon?http://www.mcmaster.com/#8702k62/=oq84ifI ask for two reasons, this material is quite cheap (about 1/10 the cost of the PTFE), convenient (already cut to width), and it has superior wear resistance (about 8 times that of PTFE). It would be nifty if this could be used instead of 3/16" PTFE.
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