rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8324
Loc: Bremerton Washington
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As is.. what it is I do..... 
Here we begin the thread for the fabrication of the OTA of my 10"f/16.
It all begins with the early delivery of the 12" .090 wl 14ft of aluminum tube.
The truck used to deliver it was waaay to large for proper turn around here at GOMOC...so I drove up the road and picked it up out of the back of the 18 wheelers trailor. 
So I got to actually deliver to the site...my own tube from Hastings. Magine that.
They were prompt and the tube is well packed(well.. its in a large box...if that counts).
Here is the first pic of the monster hinding in its *box*. in the doorway of the scope shop.
Later this evening I'll bust it loose and check for damages...then begin again at fabricating the spotter mount...and begin making the baffles.
It will definately need serious sanding and removal of the welding seam.....for sure. Painting it Celery green..
Weeeeee......
Now Back plates can be made and lens cells too.....
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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mikey cee
Post Laureate
Reged: 01/18/07
Posts: 3517
Loc: bellevue ne.
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Well Rob if it's damaged it can still be used in your new irrigation system for watering your acreage if the climate drastically changes!!  Mike
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7x35 and 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, "The 8 Ball" 8" f/13.3 brandt refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957), 4.25" f/14.8 tasco 20te.
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Scott Horstman
Vendor- Backyard Observatories
Reged: 03/11/04
Posts: 8074
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So open the darned box already! 
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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8324
Loc: Bremerton Washington
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Quote:
Well Rob if it's damaged it can still be used in your new irrigation system for watering your acreage if the climate drastically changes!! Mike
Good idea...however, you need to think bigger.
I was thinking of using it as a *culvert* across the road.. to the lower 48....
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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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8324
Loc: Bremerton Washington
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Quote:
So open the darned box already!
I will......I have several more patients till that unvailing.
You think it will be silvery......  
JeffB will probably attest to its silveryness..... 
I'll sneek away in a moment and take a peek.
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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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8324
Loc: Bremerton Washington
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Sun popped out so I ran out to the scope shop and pulled the tube out of its box.......Bamn! Man is that tube buge!
First thing I noticed is a *DENT* midway on the tube.
A dent! The ends were perfect..no problems...but a dent!
Well I huffed it up onto my optical bench for a closer look and sure enough a dent that coveres about 3" of surface. I probably can knock it out with a long hammer....
Here it is on the bench.
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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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8324
Loc: Bremerton Washington
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Here is another with the dent visible.
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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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8324
Loc: Bremerton Washington
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Here I circled the dent......I hope I can get this thing out.
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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Scott Horstman
Vendor- Backyard Observatories
Reged: 03/11/04
Posts: 8074
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Might have to drill a little hole and use a dent puller. That's sure a bummer.
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oldsalt
Astro Philosopher
Reged: 02/12/05
Posts: 8669
Loc: Pa - between starparties
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If it is an Oil can type dent, don't use a hammer or drill any holes, use one of those suction cup dent pullers and it should come right out.
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There are no winners in war, only bigger losers.
Jim
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mikey cee
Post Laureate
Reged: 01/18/07
Posts: 3517
Loc: bellevue ne.
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Well if you're lucky it might just be hidden by your saddle on the bottom side!  Mike
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7x35 and 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, "The 8 Ball" 8" f/13.3 brandt refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957), 4.25" f/14.8 tasco 20te.
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neo
professor emeritus
Reged: 02/12/08
Posts: 614
Loc: Iasi, Romania
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Boy, that's one huge pipe 
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Russian 15x50 binos
Home made 8" f/5 Newton on eq mount
Home made 70mm f/6 (Rodenstock Rotelar lens) Apo refractor
www.astronomy.ro
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Pedestal
Post Laureate
Reged: 03/11/06
Posts: 3850
Loc: Smoggy Bottom, Baytown,Texas
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Make yourself a wooden wedge-type dent "pusher", similar to what they use on shotgun barrels.
Hubert
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Hubert
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www.smoggybottom.org
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actionhac
professor emeritus
Reged: 08/09/08
Posts: 732
Loc: WA
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I would use a jack to push out the dent from the inside. You may need to make a split ring with the jack inside and slide it down the tube to the dent.
That's quite a scope your building. I can't wait to see the mount.
Robert
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DAVIDG
Carpal Tunnel
Reged: 12/02/04
Posts: 1985
Loc: Hockessin, De
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In college I worked on restorting pipe organs and removing dents from pipes was a common practice. Some of the pipes I work on were over 20 feet long. The method that we used was to make up a couple of hardwood plugs that were tapered slightly. The first plug would be about 1/4" smaller in OD then ID of the pipe. It was drive down the pipe with 2" x 4". Many time we attached the plug to the end of the 2" x 4". The processes was repeated a couple of times, each time with a plug that was larger in diameter to finally one was used that had the same OD as the ID of the pipe. Many time when the processes was finished you could not tell that the pipe was ever damaged. Good Luck.
- 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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Homa
super member
Reged: 06/21/08
Posts: 103
Loc: Germany,by Hamburg
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Hi,Rob
big tube  
how many is the thick wall and weight of your tube?
you need a very high pier
you need a ladder to observing at horizon
Regards Marc
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i very like historic refractors
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Owen
professor emeritus
Reged: 06/21/07
Posts: 514
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Here's what I would do...
Chuck a bag of dry-ice (drikold, solid CO2) on it (like the 'paint free dent repai guys) - and watch it pop right out...
Alternatively, get some all-thread (10mm +), a nice big T nut a piece of 4" square timber, and some ply...
From the ply route a few disks (one fractionally less, the next, slighty smaller again, and so on.
Glue the ply together to form a crude tapered disk, drill a central (ish) hole, and insert T nut.
Drill hole in 4" timber centrally, so that the load is spread over the tube.
Using the all thread, and a spare pair of nuts, draw the disk down the pipe (will need a socket wrench at the worst of the dent...)
It will push it back out.
Have fun
Owen
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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8324
Loc: Bremerton Washington
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Quote:
Might have to drill a little hole and use a dent puller. That's sure a bummer.
Indeed...it's a bummer. Not sure I'm gonna drill any holes yet. Still planning my attack.
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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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8324
Loc: Bremerton Washington
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Quote:
If it is an Oil can type dent, don't use a hammer or drill any holes, use one of those suction cup dent pullers and it should come right out.
I've used those type of pullers..they work good on thin walled door pannels...but pulling back .090 material will be a bit tougher. That's nearly 1/8" thick.
Tough stuff.
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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rwiederrich
Goldfinger
Reged: 11/17/05
Posts: 8324
Loc: Bremerton Washington
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Quote:
Well if you're lucky it might just be hidden by your saddle on the bottom side! Mike
Mike.....that was my first thought. Just hide it. But It would bother me to complete distraction.
No matter what I do that spot will still be blemished so it will probably live close by the saddle anyway.
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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