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Sears(Towa) #4-6340 Enhancements & Upgrades

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#101 Sky Muse

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Posted 21 October 2018 - 10:02 PM

The Meade nosepiece is the same way. Not sure if it made any difference but I did bore it out just in case.

I could certainly grind it out, instead.  I may just do that very thing.



#102 AstroKerr

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Posted 22 October 2018 - 12:11 AM

this is very good stuff - i am picking up a lot of good information - thank you!



#103 Sky Muse

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Posted 22 October 2018 - 01:04 AM

I could certainly grind it out, instead.  I may just do that very thing.

8b.jpg

 

There it is, and for the good it will do.



#104 Sky Muse

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Posted 22 October 2018 - 01:52 AM

The prism-facing and objective-facing rims of the nosepiece were also blackened...

 

8d.jpg



#105 Sky Muse

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Posted 22 October 2018 - 05:06 AM

Turning back the decades; the inside of the housing and the eyepiece-holder were prepared for blackening...

 

10.jpg

 

Here, the clear-satin has been applied to the eyepiece-holder only...

 

12.jpg

 

The cotton ball was to keep the clear spray out of the interior of the holder and housing.

 

Satin-black on this side, and chalkboard-black on the other...

 

14.jpg

 

11.jpg

 

As with my other diagonals, I blacken halfway up the holder...

 

15.jpg


Edited by Sky Muse, 22 October 2018 - 07:02 AM.

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#106 Sky Muse

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Posted 22 October 2018 - 06:12 AM

17.jpg

 

16.jpg


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#107 Sky Muse

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Posted 22 October 2018 - 07:18 AM

18.jpg

 

The masking-off and spray-painting resulted in a near-perfect coverage; near-perfect, that is.  I will be going over select areas by hand later on today.


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#108 Sky Muse

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Posted 22 October 2018 - 06:30 PM

These are areas that a can cannot touch; the stoned edges of the glass here and there...

 

19.jpg


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#109 Sky Muse

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Posted 22 October 2018 - 07:26 PM

20.jpg

 

21.jpg

 

Two coats were applied, and with a blow-drying after each.  I use a blow-dryer for my "oven".  You don't have to be Rembrandt to do this.  In a moment, I'll scrape off the excess with toothpicks.  If I unintentionally scrape any paint off a critical area or two, I'll then go back over those with an even finer-tipped brush.

 

22.jpg


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#110 Sky Muse

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Posted 22 October 2018 - 08:05 PM

At present, I'm not seeing any touch-ups required after scraping away the excess paint.  I'll need to pop it into the housing to know for certain.

 

An all-white background was placed behind the smaller faces.  They seem to be MgF2-coated...

 

24.jpg

 

The long side, and a glamour shot...

 

23.jpg

 

I'm seeing a little something over there on the left.  I'll find out later.


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#111 Sky Muse

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Posted 22 October 2018 - 09:22 PM

The black-paper backing for the prism may or may not be original.  If I had replaced it, it was many years ago, and I have no recollection of having done so.  In any event, it's now flocked...

 

28.jpg

 

The spring there was cleaned of its rust.

 

I had neglected to show the blackened interior of the housing...

 

26.jpg

 

The set-screw for the prism is immovable.  It doesn't, however, jut inward so far as to prevent a proper centering.  I will need to immobilise the prism using shims, and that's going to take a bit of thought...

 

27.jpg


Edited by Sky Muse, 22 October 2018 - 11:42 PM.

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#112 Sky Muse

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Posted 22 October 2018 - 11:40 PM

The shim: a piece of red felt, cut to fit the substrate...

 

30.jpg

 

The prism required a slight push downward afterwards; just right.

 

The prism, completed...

 

25.jpg

 

29.jpg

 

I "fondly" remember that narrowing of the circle on the eyepiece side.  It's always been like that, but by the time an image reaches that point, the beam is almost at its narrowest.

 

Before and after...

 

31.jpg

 

This diagonal, and the 20mm Kellner adjacent to it, were the two components on the other end of my Sears 60mm f/11 achromat, and with which I saw my very first astronomical object, Saturn, at 35x.  That was about 45 years ago...

 

32.jpg

 

I'm 54 now.


Edited by Sky Muse, 22 October 2018 - 11:43 PM.

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#113 Sky Muse

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Posted 23 October 2018 - 12:34 AM

Now knowing that I don't need to drill any holes, I can now treat the inside of this wee achromat...

 

optical tube.jpg

 

There're a lot of bumps inside the tube, which would make flocking more difficult.  It turns out that the most beneficial location of the flocking begins right behind the objective.  But if I run it all the way up to same, it may reduce the diameter of the aperture, albeit slightly.  But in refractorland every single millimeter counts.


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#114 Sky Muse

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Posted 23 October 2018 - 08:46 PM

optical tube6.jpg

 

In that the dew-shield was flocked, I can't imagine any stray light entering the optical-tube itself, given its rather small diameter.  Before and after three coats, one of ultra-flat black, and sandwiched in between two of chalkboard-black...

 

optical tube3.jpg

 

The forward-facing rim of the tube that faces the objective, and that can be seen through the doublet, was also blackened...

 

optical tube5.jpg

 

After a day or so, the achromat can be reassembled.


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#115 Sky Muse

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Posted 24 October 2018 - 06:44 AM

Waiting on the li'l darlin' to air out...

 

optical tube7.jpg

 

But I haven't been idle, as the mount for it has already been taken apart, and assessed for replacement parts.


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#116 Sky Muse

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Posted 24 October 2018 - 07:19 AM

I've got this coming for the improvised tube-rings...

 

https://www.ebay.com...872.m2749.l2649

 

Nice 'n' cushiony for the li'l darlin'.


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#117 AstroKerr

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Posted 21 December 2018 - 06:36 AM

Nearly able to follow in your dark, dark footsteps Alan - Rosco Super Saturated Velour Black 'The Shaft' mentioned elsewhere nearly hear, as well as the ultra and chalkboard paints used here. Crushed walnuts arrived today (they're for reflector tubes), and realized I haven't ordered the flocking (Protostar or ScopeStuff - might be a subconscious block there) now that I'm sitting still, but the Chicken Door upgrade is working, and new 15w LEDs are in the Inflato-Xmas-tree.

 

I think I have some black fluff in my model RR tubs that would make nice flocking - have to look. Someone posted about using fiberglass window screen, and I have some, so that'll get a try. 3M Spray on parchment paper and then RR fluff (or grit - I might be thinking of the black track ballast stuff) 

 

Been following the blackening / flocking threads because the prisms in the Empire Prismatic and two others need attention, and I have an Edu-Science (and a few others) desperately in need of contrast. side note: do not, as I have, discount Edu-Science and the like as cheap pieces of mumphurumph out-of-hand - the mounts, focusers and generally the finders bite, but the objectives seem decent enough compared to the classics I have - I am / was surprised -  the $16 throwaway will be a keeper after the "SkyMuse et al" treatments are complete.

 

I'm waiting for Safeway to open up because Sybil put in a last minute request @ midnight for Xmas Chili nlt 8 a.m.for a shindig at her parents' and I only have a large but solitary Serrano at the moment. Give me a chance to pick up my own cider vinegar and ponds...

 

Thank you, all, for these wonderfully instructive, detailed, and well considered posts - I have great need of your knowledges and ingenuities for the herd of strays here - my thanks & Merry Holiseasons to all!!


Edited by AstroKerr, 22 December 2018 - 12:27 AM.

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#118 deepwoods1

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Posted 21 December 2018 - 09:38 AM

Just came across this thread. Wonderful work!


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#119 tony_spina

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Posted 27 December 2018 - 12:15 PM

Alan,

Any progress on this scope?


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#120 Russell Smith

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Posted 30 December 2018 - 10:29 AM

popcorn.gif


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#121 Sky Muse

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Posted 30 December 2018 - 11:48 AM

Gentlemen,

 

As I was plodding along with this, I found these, and which suddenly took precedent...

 

https://www.cloudyni...7886-happy-day/

 

...and understandably I trust.

 

Those tripod-legs however will be of no consequence in relation to this achromat.  Instead, the achromat will require a mounting, and the hyper-tuning of my Celestron Deluxe CG-2(EQ-1).  I had a delay in that, too, which Celestron graciously rectified under warranty, and in a most timely manner, the details of which I will share when the time comes, as I do like to share my faults when they occur; most of them anyway.

 

Incidentally, I really don't want to use that anodised-blue dovetail-bar with this achromat, therefore I'm still mulling that over in addition.


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#122 Sky Muse

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Posted 30 December 2018 - 11:52 AM

popcorn.gif

rofl2.gif

 

I adore your animation.



#123 silodweller

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Posted 08 January 2019 - 03:22 AM

The surprise...

 

attachicon.gif mounting solution.jpg

 

I had forgotten that the anodised-orange bar was already spoken for, and for the Celestron 70mm f/13 achromat...

 

attachicon.gif 4.jpg

 

But I did have the Meade-blue one, and from the Meade 90mm f/10 achromat...

 

attachicon.gif kit.jpg

 

All's well that ends well.

 

The copper-plated "malleable"-iron rings are slightly chunky for the scale of this 50mm, specifically where the clamps close, but overall diminutive nonetheless.

I see you've replaced the annoying little "red dot finder" that comes standard with the Celestron Astromaster 70.  I wish, oh how I wish Celestron had fitted a standard finderscope.   




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