tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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And here I've turned it over and taken the tape off.
I did it now, when the glue's only had about 45 minutes to dry, because I wanted to be able to wipe the excess off if any got between the tape and the wood. And I used a water-soluble glue so I could get it off if I needed to.
but I didn't need to!
Gosh, wood looks so good!
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Now, I've got a problem, but it's not a huge one.
I set the remaining 4 sides, with the tape holding them together, on top. And I've got about a 3/32" gap left over when I put one side against the bevel on the glued-on side.
So, I'm going to have to do what I did with my Springfield tube. And that is to put the remaining 4 sides on one at a time, and cut a new one for the last side that's just a tad wider than the rest to fill the gap. That'll be easier than trying to sand the bulkheads when they're in place. And I have enough of the plywood left over to do it.
I'm going to try to do that before I close up for tonight, so it'll be dry and ready for polyurethane tomorrow.
-Tim.
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8226
Loc: Bremerton Washington
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That is looking great and coming along very well.
I'm only assuming you will paint the inside that is finished first before you glue the other half(that has been painted beforehand) together...?
Pretty stiff tube...and I'm assuming pretty light too.
Thanks for posting/
Rob
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www.goldmtobservingcenter.com
A great place for amateur astronomers, and ATM's to come and enjoy their hobby.
http://tech.groups.yahoo.com/group/HomemadeRefractorTelescopes/ My homemade refractor group.
www.vimeo.com/6014031
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Hi Rob:
Yes, I'm painting the remaining sides as I tape them up and get ready for gluing.
Since I've decided to lay them up one at a time, I found I can file off the high corner on the bulkhead that's holding the plywood corners apart. If I'm lucky, I can get them all to fit tight. Only two more to go!
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Here's the 2nd to the last getting glued up and ready to swing into place:
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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DAVIDG
Carpal Tunnel
Reged: 12/02/04
Posts: 1962
Loc: Hockessin, De
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Tim,
Really looks great and really fast work. You'll be observing in no time. Get your 'scope finished so you can meet us back on Breezy Hill next month !
- Dave
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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schief. 60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4.5" f/16 Schupmann Medial refractor, 14 Stellafane awards 7 in optics
Engineering = Taking what you have and making what you need.
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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8226
Loc: Bremerton Washington
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Quote:
Here's the 2nd to the last getting glued up and ready to swing into place:
Well holy moly man.....You're movin out. Don't rush things just for us. Is the temp up high there and so the glue is drying fast? You're moving out for sure.
How you gonna fix the cell to the wood baffle?
Rob
--------------------
www.goldmtobservingcenter.com
A great place for amateur astronomers, and ATM's to come and enjoy their hobby.
http://tech.groups.yahoo.com/group/HomemadeRefractorTelescopes/ My homemade refractor group.
www.vimeo.com/6014031
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Quote:
Tim,
Really looks great and really fast work. You'll be observing in no time. Get your 'scope finished so you can meet us back on Breezy Hill next month !
- Dave
Boy, I'd sure love to go back to Stellafane! but unless I flew, I can't justify that much time off this year.
Do you think they'd let me carry that OTA on the plane? 
-Tim.
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Quote:
Quote:
Here's the 2nd to the last getting glued up and ready to swing into place:
Well holy moly man.....You're movin out. Don't rush things just for us. Is the temp up high there and so the glue is drying fast? You're moving out for sure.
How you gonna fix the cell to the wood baffle?
Rob
Well, the glue sets up in about a half hour or so. Won't be good and dry for a day, though.
I ended up packing it in before making that last slat. Sun went down, so it was already about 8:30.
I plan on making plywood rings to hold the cell, with thin ones on either side of it to keep it in. One of those will be removable to get the lens and cell out. And then the dewshield will live outside that.
I'm hoping I can get most of the OTA done this weekend, but fittings and stuff may take a bit longer.
One thing that'll help is that I plan to use polyurethane to finish the tube, and it dries very fast. I should be able to put about 3 coats on in an hour or two.
-Tim.
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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NHRob
Post Laureate
Reged: 08/27/04
Posts: 3131
Loc: New Hampshire
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Tim,
Awesome work! Do you plan to use water-based urethane?
Rob
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Rob
**********************
Canon 12x36 IS binos
TEC-140: #433 on CGEM
Faworski orthos (7,10,16.7mm)
stuff ...
no free time ... lots of clouds !
" Life is what happens to you while you're busy making other plans" !!
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Yep. Probably Varathane floor urethane, as I have some left over from my 12.5" Cass tube.
-Tim.
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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clintwhitman
Caveman
Reged: 01/01/07
Posts: 2404
Loc: ValVerde CA(SoEasyaCavemanCanD...
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Tim Awsome wood monster scope... Wow you should bring it to Mount Pinos on Aug 14th for the Second Anual Classic Star Party!!!!! You have to be there this time!!! (aveman
After looking at the post for a while I was wondering if you did a ray trace drawing for the light path? 
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Clint&Debbie Whitman (aveman
1960s 6"F15 Jaegers-Unipons by John Pons on a Byers 812, 1947 4" F15 TINSLEY, 1965 10" F8 CAVE, 1950 5CM & 6.5CM Nippon Kogakus (the twins), 1960s UNITRONS a 152 restored a 160 numbered green lens original mint a 114 original 50s mint, 1950s UNITRON M100 100mm F15 OTA, WO 80mm Florite, ASTROPHYSICS 155 EDFS on LOSMANDY G11, a bunch of Tascos,Sears Mayflowers The list goes on Add infinitum.
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Hi Clint:
I may try to do that August thang this time!
I didn't do any ray trace, just made sure that the light cone gets through with a 3" circle where the focuser mounts, so there's no vignetting and the drawtube has someplace to go.
-Tim.
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Here's the last slat all glued up and ready to swing into place. I did have to make a new one that's about 3/32" wider than the rest, and then had to use a power plane to shave off some where it's too tight. The adjacent sides aren't quite parallel, but the plane let me get the last slat in with a pretty decent fit.
--------------------
"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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And here it is in place. I had to really tension the tape across the last gap to pull it really tight, since I can't get the little clamps in there anymore.
--------------------
"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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While that dries, I'll scribble up something for a cell support, and then a dewshield to go over it.
I'm going to try to make the cell adjustable.
-Tim.
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8226
Loc: Bremerton Washington
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Quote:
While that dries, I'll scribble up something for a cell support, and then a dewshield to go over it.
I'm going to try to make the cell adjustable.
-Tim.
Man that looks great Tim. I luv the wood..it will be very sheak and beautiful when done.
One thing if I may add(Not to be critical or nothing).
But I always wonder why folks build their scopes with such abrupt back plates? there you have this wonderful tube going along then....Bamn! Flat back and then the focuser.
I think it would be slick if you turned on your lathe(If you have one) a nice piece that dropped down the tube size a bit..then you attached the focuser. I would think a nice hectagonal piece about 4~5" long the same shape as your tube but tapered. Then the focuser.
Now I know.. you have already built the tube with the focal legth of the objective in mind and at this point it is too late. When I built my 10"f/16 OTA..I knew.. that that 12" tube would have to come to an end and have an enormous back plate. I intentionally built up the focuser body to be 6" OD and then the collimation ring that connects the focuser to the backplate was 8"OD. With this incromental stepping...the large tube didn't look so *bulky* when it came to an end. It kinda *steps down* to the EP.
Anyway....in no way was I criticizing your project..it is awesome and very well built...and very beautiful.
I guess that's just me talking...I try to do things differently.
I can't wait to see your solution for the adjustible cell and its attachment to the OTA...... 
Rob
--------------------
www.goldmtobservingcenter.com
A great place for amateur astronomers, and ATM's to come and enjoy their hobby.
http://tech.groups.yahoo.com/group/HomemadeRefractorTelescopes/ My homemade refractor group.
www.vimeo.com/6014031
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Well, I do plan to cover that chinese plywood on the end. I may make a 9-sided backplate using the walnut plywood, or I may use solid stock. But I probably didn't leave enough backfocus to add much of a step-down to it.
My cell support so far is quite ugly! But it'll be out of sight, and painted black, so maybe it won't be so bad!
I can't find my walnut-colored wood glue. I need to fill a gap in that last corner, and the regular glue is going to look like snot when it dries!
-Tim.
-Tim.
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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Here it is, sanded and ready to poly!
--------------------
"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1390
Loc: Highland Park, CA
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And here it is, 2 coats later.
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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