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Equipment Discussions >> Refractors

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mgwhittle
Pooh-Bah
*****

Reged: 08/24/11

Loc: Chattanooga, TN
Re: 102mm achro for cheap new [Re: cavefrog]
      #6073668 - 09/10/13 06:07 PM

Use a miter saw with a carbide tipped blade. Using a hacksaw could be a mess and you cannot cut a perfectly square cut just by eye. A hacksaw is named that for reason....it hacks more than cuts.

If you have to, borrow a miter saw. Use a carbide tipped blade. You will get a square and very smooth cut.


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Old Dinosaur
Carpal Tunnel
*****

Reged: 05/08/07

Loc: Down there on the river
Re: 102mm achro for cheap new [Re: cavefrog]
      #6073670 - 09/10/13 06:09 PM

Place a good 4" hose clamp on the tube, carefully measure that it's square to where you want to cut, tighten that sucker down tight.
Measure again.
Make you cut just touching, but not removing any of the clamp.
A good hacksaw with a NEW fine tooth blade will work.
After the cut you'll need to carefully drawfile up to the clamp to get a good square end. Then drill your holes.
Trying to cut that thin tube on a lathe is about impossible!
All I wanted was the objective and a section of the baffled tube, all the rest of mine got chucked.


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cavefrog
Carpal Tunnel
*****

Reged: 11/11/08

Loc: loozyanna
Re: 102mm achro for cheap new [Re: Old Dinosaur]
      #6073682 - 09/10/13 06:16 PM

"All I wanted was the objective and a section of the baffled tube"

Quit baitin' us...whats it fer?


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Old Dinosaur
Carpal Tunnel
*****

Reged: 05/08/07

Loc: Down there on the river
Re: 102mm achro for cheap new [Re: cavefrog]
      #6073691 - 09/10/13 06:23 PM

A Solar scope project this forum goes ballistic if it's even mentioned.

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cavefrog
Carpal Tunnel
*****

Reged: 11/11/08

Loc: loozyanna
Re: 102mm achro for cheap new [Re: Old Dinosaur]
      #6073713 - 09/10/13 06:41 PM

haven't you been listening? that's what I wanted to cut mine down for. I still might do it. now... FESS UP!

Theo


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Ain Soph Aur
professor emeritus
*****

Reged: 08/11/11

Loc: West Tennessee
Re: 102mm achro for cheap new [Re: cavefrog]
      #6073743 - 09/10/13 07:04 PM

I have been kicking around the idea of picking up another OTA just for solar. I do want to invest in a mitre saw as I need one for multiple projects anyway.

I am thinking along the lines of triming the tube to where the Baader Herschel will focus with a binoviewer. Since this would be a rather drastic haircut, just remove the baffles or at least the rear baffle and flock the tube with protostar. Powdercoat the tube white for better solar thermal handling during hot summer days..

This should be a fantastic, light weight, white light solar scope.


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Old Dinosaur
Carpal Tunnel
*****

Reged: 05/08/07

Loc: Down there on the river
Re: 102mm achro for cheap new [Re: Ain Soph Aur]
      #6073751 - 09/10/13 07:08 PM

I kind of wish now I had bought 2 of them for the price and set one up for WL only. 4" is an ideal aperture size for most of us. I had to stop down my 6" because the seeing was never good enough to use that aperture.

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PeterR280
Pooh-Bah
*****

Reged: 05/27/13

Re: 102mm achro for cheap new [Re: Old Dinosaur]
      #6073763 - 09/10/13 07:16 PM

I bought 2 without any real purpose other than back-up but now I am thinking a 4" true bino.

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Ain Soph Aur
professor emeritus
*****

Reged: 08/11/11

Loc: West Tennessee
Re: 102mm achro for cheap new [Re: Old Dinosaur]
      #6073769 - 09/10/13 07:19 PM

Quote:

I kind of wish now I had bought 2 of them for the price and set one up for WL only. 4" is an ideal aperture size for most of us. I had to stop down my 6" because the seeing was never good enough to use that aperture.




I totally agree there, a 4" f/10 refractor is the sweet spot here also.

I was hoping to finangle a few more OTA's before the sale ended, but unfortunately blew through my astrobudget <tm> before this deal was even on my radar and lucky I could afford the one I had last month. I think even at full price this OTA is a helluva deal, so if they don't go back on sale by the time I get a mitre saw thenI'll just buy one at regular price for the solar project.

I have tried the hacksaw (then filing) method of cutting tubes and not going back there.


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Old Dinosaur
Carpal Tunnel
*****

Reged: 05/08/07

Loc: Down there on the river
Re: 102mm achro for cheap new [Re: Ain Soph Aur]
      #6073779 - 09/10/13 07:29 PM

Cutting those thin tubes is just not much fun.
I didn't know it, but a carpenter friend of mine has a big super accurate power miter saw, wish I'd known. A test cut of about half an inch would have told me if it was accurate enough. I've got one, but it's no way good enough.


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cavefrog
Carpal Tunnel
*****

Reged: 11/11/08

Loc: loozyanna
Re: 102mm achro for cheap new [Re: Ain Soph Aur]
      #6073813 - 09/10/13 07:48 PM

Quote:

I have been kicking around the idea of picking up another OTA just for solar. I do want to invest in a mitre saw as I need one for multiple projects anyway.

I am thinking along the lines of triming the tube to where the Baader Herschel will focus with a binoviewer. Since this would be a rather drastic haircut, just remove the baffles or at least the rear baffle and flock the tube with protostar. Powdercoat the tube white for better solar thermal handling during hot summer days..

This should be a fantastic, light weight, white light solar scope.




Hmmm, sounds kinda familiar.


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Sarkikos
Postmaster
*****

Reged: 12/18/07

Loc: Scotophobe Maryland, USA
Re: 102mm achro for cheap new [Re: Old Dinosaur]
      #6073938 - 09/10/13 08:59 PM

Quote:

A Solar scope project this forum goes ballistic if it's even mentioned.




A Solar scope! You've gotta be kidding me!


Mike


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Old Dinosaur
Carpal Tunnel
*****

Reged: 05/08/07

Loc: Down there on the river
Re: 102mm achro for cheap new [Re: Sarkikos]
      #6074554 - 09/11/13 08:22 AM

Quote:



A Solar scope! You've gotta be kidding me!


Mike




35 pages to this epic, what did I miss.


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Sarkikos
Postmaster
*****

Reged: 12/18/07

Loc: Scotophobe Maryland, USA
Re: 102mm achro for cheap new [Re: Old Dinosaur]
      #6074566 - 09/11/13 08:37 AM

Skim from the beginning until something catches your eye.

Mike


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REC
Post Laureate
*****

Reged: 10/20/10

Loc: NC
Re: 102mm achro for cheap new [Re: Sarkikos]
      #6074668 - 09/11/13 09:38 AM

So how much of the tube do you have to cut off the back of the scope to get a WO BV to come to focus without needing to use the 1.6x barlow?

Also, if I do this will the rest of my general EP's work in mono mode?

Thanks,

Bob


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REC
Post Laureate
*****

Reged: 10/20/10

Loc: NC
Re: 102mm achro for cheap new [Re: REC]
      #6074780 - 09/11/13 10:29 AM

I just did a test set up with my WO BV on a roof 300yds. away and it came to perfect focus. I like to use the top corner of a house so I can see fine detail on the shingles. It really look sharp! I had to use the included 1.6x barlow and put it in the front of the diagonal.

Because of the increase of power with the barlow, I went with a pair pf 26mm SP instead of the included 20mm EP. View was a little brighter.

Now the mount...that was another thing. I was overloaded with the weight and had to use a 2.5lb ankle weight wrapped around the end of the tube and it was just about balanced.
I'm going to increase the weight a little bit more on the front before I take it out tonight. It was a little shaking if I touched it lightly, so have to be careful.

Looking for hot but clear skies tonight and can't wait to see the Moon in this scope with the BV.

I had just an ok view of the moon (light haze)last night with this new scope ad it looks promising. Plan on giving it a full test of EP's tonight and maybe compare it with my 80ED next to it at the same power.


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Ain Soph Aur
professor emeritus
*****

Reged: 08/11/11

Loc: West Tennessee
Re: 102mm achro for cheap new [Re: REC]
      #6074887 - 09/11/13 11:16 AM

REC, what diagonal are you using? Are you using the stock focuser?

My WO binoviewer will be delivered tomorrow.


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JimK
Skygazer
*****

Reged: 09/18/05

Loc: Albuquerque, NM USA
Re: 102mm achro for cheap new [Re: Sarkikos]
      #6075134 - 09/11/13 01:41 PM Attachment (9 downloads)

Quote:

Quote:

A Solar scope project this forum goes ballistic if it's even mentioned.




A Solar scope! You've gotta be kidding me!


Mike



Adding fuel to the fire regarding an older 102mm achro that I got for cheap (the C-4R, which somehow is very similar), hows this for showing the versatility of this suite of scope models (CN thread reference, click here):


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cavefrog
Carpal Tunnel
*****

Reged: 11/11/08

Loc: loozyanna
Re: 102mm achro for cheap new [Re: REC]
      #6075238 - 09/11/13 02:29 PM

Quote:

So how much of the tube do you have to cut off the back of the scope to get a WO BV to come to focus without needing to use the 1.6x barlow?

Also, if I do this will the rest of my general EP's work in mono mode?

Thanks,

Bob




you need about 3" off.

you would probably need to use a 1" 0r 2" extension to use some of your EPs again.

Theo


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REC
Post Laureate
*****

Reged: 10/20/10

Loc: NC
Re: 102mm achro for cheap new [Re: Ain Soph Aur]
      #6075273 - 09/11/13 02:41 PM

I am using an Astrotech 99% dielectric and the stock focuser. It's ok and not keen on spending $150 for a new 10:1 focuser.

Hope you have good weather to try out your WO BV tomorrow. Perfect timing with the 1st. qtr. Moon!


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