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Equipment Discussions >> Classic Telescopes

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terraclarke
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5671066 - 02/09/13 05:23 PM

Yes, that's a mistype. It is currently taken down to its smallest i.d. and its largest o.d.

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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5671075 - 02/09/13 05:25 PM

Since the spacer is a ring use a ring for the bottom as well.
I've made quite a few cells, never had a real problem with a stuck lens. It could happen. You develop a feel for taking the lens in and out. If you have a decent gap on the sides you need to take it up, otherwise you can get decentering of the lens.


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terraclarke
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Re: Milling tolerances for Jaegers objective cell new [Re: terraclarke]
      #5671089 - 02/09/13 05:41 PM

We are going for 0.01 inch tolerance. I think that will be perfect. If its too much a small bit of foil tape or drafting tape can take up the slack. I was thinking of using a gasket ring for the base. Have to see what I come up with. We will hopefully finish the cell one day next week. We still have quite a bit to do on the lathe, then cutting the threads, drilling the holes to mount it in (on really) the Unitron tube. (It will fit to the tube in the same way as will the original Unitron dew shield which will thread to the outside of the cell.

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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: terraclarke]
      #5671366 - 02/09/13 08:18 PM Attachment (11 downloads)

Terra, here are a couple of shots of my 83mm cell. This one is very simple did this during 3 lunch times at work.

This one is a PVC retaining ring using 4 2-56 screws with or without springs. You can use no springs and make the screws a finger tight with some locktite


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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5671370 - 02/09/13 08:19 PM Attachment (11 downloads)

Cell with lens. You will see what the big eyepiece is for.

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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5671373 - 02/09/13 08:21 PM Attachment (8 downloads)

lens removed from cell.

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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5671375 - 02/09/13 08:22 PM Attachment (9 downloads)

Cell

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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5671378 - 02/09/13 08:24 PM Attachment (11 downloads)

With the retainer.

Edited by bremms (02/09/13 08:25 PM)


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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5671383 - 02/09/13 08:29 PM

I like the idea of strips on the sides of the cell. Maybe HDPE or Teflon.
Thought you might like these pictures of my cell. It's very simple. And I didn't have to single point any threads..


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terraclarke
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Re: Milling tolerances for Jaegers objective cell [Re: bremms]
      #5672659 - 02/10/13 04:37 PM

Great pics Marc of your retaining cell. It looks similar to the one I am making. Thanks for the tips.

Mine too has the collar that slips over and bolts onto the tube, in my case a 76mm Unitron tube. Mine will have a little interior rim the same thickness as the Unitron tube wall where it will sit square and below that there will be 5 holes drilled to secure the cell to the tube. This cuts the aperture of the lens down from 83 to 78 mm. Above this the cell widens to accommodate the wider objective lens. Then the top of the cell will be threaded for the Unitron thread on dew shield. The entire cell assembly will stand 55 mm but 10 mm will be obscured by the dew she's shield when attached.
I built a cradle for the OTA last week which has two opposing Vixen dovetail bars 8 inches long, so the scope can be mounted on my Vixen StarGuy or my CG4 or my Unistar Deluxe. The bars are also drilled and tapped with 1/4 20 holes so I can also put the scope on my Vintage Professional Jr. Panhead 16mm motion picture tripod.

When this project is finished I will begin planning my Jaegers 4 inch F15.


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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: terraclarke]
      #5673561 - 02/11/13 07:16 AM

Did you go and buy a Zeiss Terra? They are really sweet. I do poke at them on occasion as some owners may stretch the truth about capabilities. Truth is, they really are very good. An old friend had an AS 80 840. It had superb optics and mechanics.

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terraclarke
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5673741 - 02/11/13 10:09 AM

Hi Marc,

I did. A good friend told that basically, when a good deal comes along, you've got to strike while the iron is hot. Not in those exact words but you get his meaning. It was way to good of a deal to pass up so I did just that. I haven't got it yet but should have it in a week or so. Its a Telementor T1 which was exactly the model I wanted, the one with the helical focusor, and its on a beautiful T2 mount, the one with all the pretty blue and red. I am very excited. I will post pictures when I receive it.

Terra


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Geo.
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Re: Milling tolerances for Jaegers objective cell new [Re: terraclarke]
      #5673862 - 02/11/13 11:21 AM

I was able to just fit an 83mm Jaegers into a Vixen 80mm cell. Not sure what that says.

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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: Geo.]
      #5674030 - 02/11/13 01:04 PM

If the TM was a good deal, yes strike while the iron is hot. I like the T1, the T2 sliding lens thing seems a bit odd. I never used a T2, maybe it works great.

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terraclarke
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5674295 - 02/11/13 03:52 PM

I would be afraid that the sliding objective could more easily get out of collimation?

Terra


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bremms
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Re: Milling tolerances for Jaegers objective cell new [Re: terraclarke]
      #5674398 - 02/11/13 04:39 PM

Exactly.. but it is German. They probably spent a lot of time engineering that properly.

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AllanDystrup
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Re: Milling tolerances for Jaegers objective cell new [Re: bremms]
      #5675251 - 02/12/13 04:39 AM

The T1 helical focuser has a travel of 35mm, while the T2 internal tube R&P has a travel of 100mm; Both have plenty of back-focus, eg for for a diagonal + bino. The helical focuser has a reputation for being very smooth (I've never tried it), but as an owner of a T2 I can testify that the internal R&P is also *very* precise and robust - I've never heard of any problems with that design.

The Telementor and T-mount is a uniquely innovative and well crafted example of astro engineering, and I'm sure you'll fall in love with that baby when you hold it in your arms...


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Astrojensen
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Re: Milling tolerances for Jaegers objective cell new [Re: AllanDystrup]
      #5675271 - 02/12/13 05:08 AM

Now of course I've loaned my Telementor 1 to a friend, so I don't have it at hand, but from what I recall, the helical focuser has a travel of 55mm. The back focus is about 140mm. I couldn't reach focus with my Baader Maxbright and T2 diagonal without corrector, but with the 1.5x (sold as 1.7x) corrector, it was fine. The Telementor 2 / Telemator has the internal focuser, which works extremely well. It has about 160mm back focus. I can reach focus with the Baader Maxbright and T2 diagonal without corrector with some eyepieces, but others require the 1.25x corrector.

The T-mount is almost without equal. The setting circles are 4.5" in diameter and highly accurate. You can use them to polar align in daylight with enough accuracy to use them to dial in stars and planets in daytime. I've used my Telemator to split Castor in the early afternoon.


Clear skies!
Thomas, Denmark


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terraclarke
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Re: Milling tolerances for Jaegers objective cell new [Re: Astrojensen]
      #5675427 - 02/12/13 09:06 AM

I am sure that both the T1 and T2 focusing mechanisms are excellent. I am just used to the eyepiece moving rather than the objective (although I do have 1 Mak, a Lomo which is related to post-war Zeiss and works wonderfully as well). I also have heard how wonderfully the helical focuser works. I can't wait to receive it. The mount too. I will start its own thread when it comes.

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Astrojensen
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Re: Milling tolerances for Jaegers objective cell new [Re: terraclarke]
      #5675983 - 02/12/13 02:44 PM

When you first see or use the Telementor 2 or Telemator with the internal focuser, your first thought is "what the heck is going on", but later you learn to value it, as it makes for a rock-solid bomb-proof attachment of heavy accesories, without having to worry about focuser slip and sag.

Very few 60mm's can take a binoviewer+diagonal+adapters+2x25mm LER Zeiss eyepieces. Or a 30mm ES82 2" eyepiece and 2" Baader diagonal.

The only negative I can say about it is that it's a little too coarse, but other than that, it works like a dream. Here Zeiss was *really* thinking outside the box and came up with something truly brilliant and elegant. An engineering masterpiece.


Clear skies!
Thomas, Denmark


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