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Thread: Diy 12" sct

  1. #11
    WWPierre's Avatar
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    Quote Originally Posted by DrLeoB View Post
    So.... if the optics make the scope .... is this still an LX200??
    I don't think so. It is a LEO.

    I was concerned with the stiffness of the plastic pipe. But then I saw that it was purely in compression. Elegant.
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5; Orion 127 Mak/go-to EQ5; Burgess 127f8 refractor; Sky-Watcher 5" F/5 collapsible dob; 90mm Mak/motorized EQ2; Royal Astro 76/910-GEM; Meade 60x700 refractor/alt/az; Zhumell 25x100 Coin Ops; GalilleoScope. Celestron 8mm-24mm zoom; lots of fixed EPs,some good, some..not so much. A small collection of surveying instruments; a forest of tripods; Canon Rebel Xti. Confirmed gadget junkie; Custodian of the Magnetic North Pole (Send $1.00 to Pierre each time you use a compass.)
    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

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  3. #12
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    Default Collimation successfull....

    Completed a 95% collimation on Sunday eve and checked.... through Monday ... stable. I was concerned that the wood end plates would absorb moisture from the dew and change dimensions, but not so... collimation was right where I left it Sunday. Girlfriend says I have to paint it, tho... "if you want that in the yard, paint it"..... yes, ma'am....

    Monday nite observed an awesome Jupiter, Andromeda galaxy and more of the M objects in Casseopia....

    Mount needs further work to tighten it up .... definitely on the ragged edge of what it can carry (
    C8, CPC8 w/Fastar, 2xQ3.5, 2xLX200 classics, one with 12" Homebrew hardware, Nexstar 4si,6" homebrew/ground Newt, Meade SN10 and a BUNCH of project OTA's.

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    Default Forgive the Dust ...

    Here's a quick webcam of the collimation state ... pretty close but some to go...
    sorry for the dust, as I haven't put the window back on the webcam after modding it...
    Attached Images Attached Images
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    C8, CPC8 w/Fastar, 2xQ3.5, 2xLX200 classics, one with 12" Homebrew hardware, Nexstar 4si,6" homebrew/ground Newt, Meade SN10 and a BUNCH of project OTA's.

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    Ya need some Bobs knobs there!
    Dave
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    Boy, you got that right.... this is one big scope to get around in the dark. I used the daytime colimation procedure first and now need better mount performance to get it any better. The CG5 mount has some rotational looseness that I haven't been able to find, so far. I will have to add the knobs also.
    C8, CPC8 w/Fastar, 2xQ3.5, 2xLX200 classics, one with 12" Homebrew hardware, Nexstar 4si,6" homebrew/ground Newt, Meade SN10 and a BUNCH of project OTA's.

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    Very interesting project! can you post some details about the optics and how you setup the insides
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    What is the advantage of a truss assembly here versus the original blue tube? Faster cooldown?
    Matthew Ota
    10" Meade LX250GPS SCT, 80mm
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    I used the truss support system for several reasons, primary being that I didn't have a Tube!! Second, I wanted to get something together that would at least let me work out the optics setup without too much financial outlay. And, third, I was curious whether or not common, low cost materials would be "stiff" enough in this kind of a setup. They are!!!

    Overall, the tube diameter is 17" (dictated by the available table tops), the mirror to corrector plate is approx. 20" with focus travel or 4" (turns out to be way too much travel, 1-1.5" is more like what is needed. The supports are white, sked 40 PVC and the black mirror baffle tube is ABS with appropriate fittings. Cork lamp feet disks are used to support the corrector plate, wall mirror z-brackets are used to retain the corrector plate in the front mount.

    The optics are Meade, LX200 standard SCT. The clear aperture is 12" more or less (used a sabre saw to cut the nole/not as round as it could be) and the main mirror is mounted on its normal focuser mount arm.

    I used the photographers drape to cut down scattered light, allow the tube to breathe and cool down quickly and to provide some bug defense for the optics.

    I have found the source of the mount instabilities and corrected the loose hardware causing it. I am now in the process of completing the thrust/sleeve bearing coarse focuser which does seem to work really well. Tonite should see that piece complete.

    The only real issue, now, seems to be the classic "mirror flop" problem from the original SCT design strategy. I have designed a cantilever lever/screw arrangement which may solve even that.

    Observing has been a lot of fun, with Jupiter, Moon, Andromeda Galaxy, Orion's trapizium/nebulosity providing "Eye Popping" views.

    My poor little C8...
    C8, CPC8 w/Fastar, 2xQ3.5, 2xLX200 classics, one with 12" Homebrew hardware, Nexstar 4si,6" homebrew/ground Newt, Meade SN10 and a BUNCH of project OTA's.

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    The weight of the OTA is pretty much a wash vs. the Al tube from Meade at about 35-37 lbs.

    The ABS tubing is "deadened" by painting with Rust-o-leum (NOT an endorsement, just what I had on hand) Flat Black barbeque hi-temp paint. This stuff is really flat in specular reflectance.

    This weekend will see all the pieces get painted and the final focuser (ver. 4.0) installed.

    Camera mount, next....
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  19. #20
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    Outstanding!
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5; Orion 127 Mak/go-to EQ5; Burgess 127f8 refractor; Sky-Watcher 5" F/5 collapsible dob; 90mm Mak/motorized EQ2; Royal Astro 76/910-GEM; Meade 60x700 refractor/alt/az; Zhumell 25x100 Coin Ops; GalilleoScope. Celestron 8mm-24mm zoom; lots of fixed EPs,some good, some..not so much. A small collection of surveying instruments; a forest of tripods; Canon Rebel Xti. Confirmed gadget junkie; Custodian of the Magnetic North Pole (Send $1.00 to Pierre each time you use a compass.)
    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

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