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Sears(Towa) #4-6340 Enhancements & Upgrades

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#51 Sky Muse

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Posted 17 October 2018 - 12:44 AM

finder15.jpg

 

finder14.jpg

 

I will need to surf the web for others of its age, and older, and so to better gauge where to place it exactly.  I can't locate it forward to the point where it would interfere with the rings, and the balancing.  It will be directly in line where the original once was.  


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#52 tony_spina

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Posted 17 October 2018 - 12:08 PM

bow.gif  great work


Edited by tony_spina, 17 October 2018 - 12:08 PM.

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#53 Sky Muse

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Posted 18 October 2018 - 03:10 AM

Yesterday, I went out for some things.  I had these #4 round-head screws already, but I wanted the #4 flat-heads instead.  I also replenished my supply of #6 lock-washers...

 

riser hardware.jpg

 

riser.jpg

 

The screws will need be cut down, once I insert that assembly into the new holes that I'll need to drill into the optical-tube.

 

Instead of the clear spar-satin varnish, I got a can of clear-satin enamel for the tube-rings...

 

clear satin.jpg

 

It's been 24 hours since I blackened the rings.  I had sprayed on the equivalent of four to five thin coats, and two in sprayings, so I'm going to wait until during the day today to seal them.  I want the paint to be thoroughly dry.  Here they are hung up, and with a little paper roof to keep the dust off of them...

 

blackening3.jpg  

 

I saw the hammered-finish black in a rattle-can, but then they would appear as modern clamps.  They're already textured somewhat, and they sold that type of finish, too.  They also had clear semi-gloss, but I was afraid that that would appear too new as well.  The stainless-steel thumbscrews are scheduled to arrive tomorrow.  I had also picked up three #10 stainless-steel flat-washers, and a snap-ring kit...

 

snap-rings.jpg

 

It turns out that the 10-24 thumbscrews will need this size to make them captive...

 

snap-rings2.jpg

 

I do hope it works out.  I have no idea if I'll ever have a need for the rest of those.

 

Now you know why it took me two years to get around to getting this achromat ship-shape.  I knew it was going to be involved.  It was the mounting solution that held me back, and other aspects to a lesser extent.

 

If I had a furnace nearby, I'd chuck the original mount into it without hesitation.


Edited by Sky Muse, 18 October 2018 - 03:13 AM.


#54 Sky Muse

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Posted 18 October 2018 - 03:39 AM

This is where the finder will be positioned, lengthwise, and as far back as possible so as not to interfere with the tube-rings and the balancing.  Gads, that red-dot is relatively enormous...

 

finder16.jpg

 

I've got to find a smaller red-dot.



#55 Garyth64

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Posted 18 October 2018 - 08:01 AM

Just a thought . . .

 

You got rings to hold the scope to the mount.  Why not have used a second set of rings to mount the finder to? 

 

Like on a Sears 6339a:

Sears finder.jpg

 

That way you wouldn't have had to drill any more holes in the tube.


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#56 Sky Muse

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Posted 18 October 2018 - 04:44 PM

Just a thought . . .

 

You got rings to hold the scope to the mount.  Why not have used a second set of rings to mount the finder to? 

 

Like on a Sears 6339a:

attachicon.gif Sears finder.jpg

 

That way you wouldn't have had to drill any more holes in the tube.

On a much smaller scale, it would certainly be possible, and requiring nothing larger than a 5x24; mustn't compete with the main aperture.

 

At this point, I haven't drilled any holes yet; yet.

 

Incidentally, those slow-motion cables are a lost gem, and art.


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#57 tony_spina

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Posted 18 October 2018 - 05:30 PM

How about something like this. It is shorter than the one you are thinking of using 

 

https://www.amazon.c...s=red dot sight



#58 Sky Muse

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Posted 18 October 2018 - 05:31 PM

I was toying with the diagonal yesterday, and as I twirled it round in the indoor lighting I saw a reflection of the white-paper backing for the prism that I had installed.  It's now history, and with a black-paper backing, flocked, in its stead...

 

flocked.jpg


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#59 Sky Muse

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Posted 18 October 2018 - 05:40 PM

How about something like this. It is shorter than the one you are thinking of using 

 

https://www.amazon.c...s=red dot sight

I had looked at that very style, the Agena Astro model.  Orion used to offer it as their "EZ  Finder Deluxe II".  The brightness looks to be adjustable, for astronomy.  Sounds like the winner.  Thanks.



#60 Garyth64

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Posted 18 October 2018 - 05:55 PM

I was toying with the diagonal yesterday, and as I twirled it round in the indoor lighting I saw a reflection of the white-paper backing for the prism that I had installed.  It's now history, and with a black-paper backing, flocked, in its stead...

 

attachicon.gif flocked.jpg

 flocked, in its stead . . .      . . .      . . .  what?  smile.gif

 

Did you drop it?



#61 Sky Muse

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Posted 18 October 2018 - 06:13 PM

The tube-rings have now been sealed with the clear-satin enamel...

 

sealed.jpg

 

sealed2.jpg

 

No, they're not attached to the bar, not quite yet.

 

Incidentally, had I used Krylon's "Satin Crystal Clear", an acrylic, the finish could've easily turned milky.  I had recently got a new can of that, but not for the rings. 


Edited by Sky Muse, 18 October 2018 - 06:34 PM.


#62 Sky Muse

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Posted 18 October 2018 - 06:15 PM

 flocked, in its stead . . .      . . .      . . .  what?  smile.gif

 

Did you drop it?

No, it was not dropped.  I replaced the white-paper with flocked black-paper, is all.


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#63 Garyth64

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Posted 18 October 2018 - 06:41 PM

In that last picture you show about your brackets.  You could have the same set up to hold your red dot finder, or similar.   It would also be adjustable on the tube so you wouldn't have to worry too much about balance.

I think you know what I initially meant, but I just want to be certain.


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#64 Sky Muse

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Posted 18 October 2018 - 07:15 PM

The reducers have been installed, reduced from 3/8 to 10-24, and with J-B Weld™ epoxy; I can't have them coming loose...

 

reducers.jpg

 

reducers2.jpg


Edited by Sky Muse, 18 October 2018 - 07:21 PM.

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#65 Sky Muse

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Posted 18 October 2018 - 07:50 PM

In that last picture you show about your brackets.  You could have the same set up to hold your red dot finder, or similar.   It would also be adjustable on the tube so you wouldn't have to worry too much about balance.

I think you know what I initially meant, but I just want to be certain.

I understand precisely what you mean.  I could do something along the lines of this...

 

cable ties.jpg

 

...not those exactly, mind you.  I'll need to brainstorm that.idea.gif

 

I'm not gung-ho about adding non-factory holes.



#66 Garyth64

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Posted 18 October 2018 - 09:30 PM

I made these brackets for a 40mm finder to fit on a standard 60mm tube.

 

finder brackets for 60mm.jpg

 

I used ½" aluminum, cut them out on a bandsaw. 

 

My inspiration was the brackets on the Sears scopes.


Edited by Garyth64, 18 October 2018 - 09:31 PM.

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#67 Sky Muse

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Posted 18 October 2018 - 09:38 PM

I made these brackets for a 40mm finder to fit on a standard 60mm tube.

 

attachicon.gif finder brackets for 60mm.jpg

 

I used ½" aluminum, cut them out on a bandsaw. 

 

My inspiration was the brackets on the Sears scopes.

I wouldn't need the red-dot to rise above the tube to that extent.  Two single rings would serve.



#68 Sky Muse

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Posted 18 October 2018 - 09:52 PM

mounting solution3.jpg

 

I have some thin aluminum sheet, which would serve given that a red-dot is pretty much all plastic.



#69 Sky Muse

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Posted 19 October 2018 - 02:25 AM

The Preac table-saw comes in handy, and for things in miniature, like this telescope...

 

finder17.jpg



#70 Sky Muse

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Posted 19 October 2018 - 03:38 AM

finder18.jpg


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#71 Sky Muse

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Posted 19 October 2018 - 04:30 AM

finder19.jpg


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#72 Sky Muse

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Posted 19 October 2018 - 05:02 AM

finder20.jpg


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#73 Sky Muse

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Posted 19 October 2018 - 04:18 PM

The ringlets for the finder-base have now been sealed...

 

finder21.jpg

 

They will be lined with green felt, but I will need some #4 stainless-steel screws and nuts to fasten them.  The holes at the tops were extruded to accommodate the screw-heads when mounting the base.


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#74 Sky Muse

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Posted 19 October 2018 - 05:31 PM

finder22.jpg

 

The felt is in place, but still with its backing-paper.  The base is not attached to the ringlets, only perched atop.  The two screws and nuts are temporary, as they are of zinc-plated steel.  I'm wanting the paint to cure in that final position, and whilst the paint is still elastic.

 

My personal thanks to Gary, for his prudent suggestions, and in preventing my having to drill holes into the optical-tube, as it certainly has enough already.  Also, the ringlets can be slid back and forth, and rotated as well; those and the finder itself. 


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#75 Sky Muse

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Posted 19 October 2018 - 05:50 PM

The stainless-steel thumbscrews arrived today.  I had already picked up the stainless-steel washers for them the day before.  Here, the rings are attached to the dovetail-bar, but only for a test-fitting, and a glamour shot...

 

tube rings.jpg

 

I do not like that anodised-blue, at all; not with this telescope.  I suppose bare aluminum would be the lesser of the two evils.

 

All of this, and for an itty-bitty, teeny-tiny, liddle-widdle telescope.


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