Friday, June 23, 2017

Bob's 16" F4.5 --- Just About Complete . . .

I always assemble my telescopes completely so as to check
for fit, finish and motion. In this case -- it's right on!!
The partially assembled OTA and ready to place in the rocker box.
It's easy to grab the top ring of the mirror box and lift the assembly
 into the rocker. A little leverage makes the job a snap.
 
Add the "intermediate" ring. Note the washers are "up:
This keeps the top-half of the struts from digging 

into the wood ring.

Add the top half of the struts, strings,
sliding counterweight and finder(s).
Finally, add the top ring. I make the struts a bit "off center".
this puts stress on the assembly as it lines up and
creates a more rigid OTA. Note the strings as well.
The mirror box, strings and mirror cover. I like to
use Lemon Oil Pledge on the bearings surfaces to
clean and lubricate the Ebonystar and Teflon.

Wednesday, June 21, 2017

14" String Strut Kit for Peter ....t

The OTA for Peter's 14" kit. This will be a  "string-strut" with
Easy Travel Telescope option. Peter lives in  Canmore, Alberta, Canada.

Saturday, June 17, 2017

Bob's 16" -- Getting Closer to Completion . . .

The Optical Tube Assembly just about complete. The
altutude bearings need varnish and the Ebony Star laminate.

The rocker box assembled with clamps to check
the "fit". It's great!!

The "strings" and intermediate ring. Works perfectly.

The "strings" tension is adjusted via a turnbuckle.

Wednesday, June 7, 2017

More on Bob's 16" String-Strut Telescope

The "mirror board", custom cover and upper ring.

Bob included a JMI focuser and Protostar spider for his telescope.

Tuesday, June 6, 2017

Bob C's 16" F4.5 String-Strut Telescope . . .

Bob's 16" is coming along. Here, the 6-point flotation mirror
cell is affixed to the mirror. I wait 24-48 hours for the silicone to cure.

Bob sent along a Protostar spider to integrate with his "remake"
I've mounted the focuser a bit to the "horizontal" so the eyepiece
is easy to access when the telescope is higher in the sky.

Note the focuser bracket to the left of the spider.

Saturday, June 3, 2017

Packaging Keith's 17.5" Telescope. . .

With "big" mirrors, like Keith's 17.5" I like to make a wood box.
The rocker box and mirror box. note that the mirror box
nests into the rocker box. Great for shipping, storing and moving.
The Upper Tube Assembly fits into a standard 28" square box. 
Keith 17.5" F4.5 truss telescope all packaged
up and ready to ship. Whew!!!

Thursday, June 1, 2017

Keith's 17.5" F4.5 Truss -- 99.9%!!

Keith's 17.5" will be completed tomorrow. I'll start packaging up
the telescope on Saturday. It's rather easy to manage when dis-
assembled -- otherwise it's a BIGGY!! Nice.

Detail of the mirror box and rocker box. The primary has
yet to be center marked with a donut. I'll do that tomorrow.

All of my telescopes include a "custom mirror cover".

Detail of the mirror box. Note the 1.25" "struts" for a nice rigid assembly.

The mirror sits on a 6-point flotation cell.

The focuser is a 2-speed 2" Moonlite with compression ring. The
spider is an Observatory-Grade 4-vane curved-vane Destiny.

My good buddy Jim dropped by and snapped this photo of yours truly and
Keith's telescope. To the left is a 12.5" for a high school astronomy club.
In the foreground is a 13.1" string-strut F4.5 (for sale).

Wednesday, May 31, 2017

And this from Australia . . .

One of my customers, from Australia, posted this on the reflector forum on Cloudy Nights. Sorry I don't have a name:

I bought this 16" Dobstuff kit ages ago for my 16" f4.5 Mark Suchting mirror. I finally got around to putting it together. I modified it a little to accept a wire sling. I used extra thick walled aluminium tubes for the struts and extra clamps. I am very pleased with just how well it all works and can highly recommend Dobstuff scopes.

Monday, May 29, 2017

A 17.5" for Kieth....

As the OTA nears completion, I can now begin work on
the rocker box. I assemble the rocker with clamps to check the fit.

In this case, the fit is just right!!

Sunday, May 28, 2017

A bit More on Keith's 17.5" .....

With Keith's mirror box complete, I should be able to complete the entire
OTa by mid-week. In this photo, note the Moonlite truss blocks.
Ten 1.25" struts make for a nice rigid assembly.
Once I add the altitude bearings,
the OTA will be complete. 

Thursday, May 25, 2017

17.5" for Keith -- OTA Nearing Completion . . .

The rear of the mirror board. Note the 'feet" which support the OTA when standing
alone. The rear of the 6-point mirror cell and larger ventilation hole.

The mirror board with custom mirror cover and UTA.

Here the mirror cover is removed. The 17.5" mirror is a beauty!!

Tuesday, May 23, 2017

Keith's UTA Complete . . .

Keith's UTA sports a Moonlite 2-speed 2" focuser with compression ring,
Destiny Observatory 4-vane curved-vane spider and Moonlite truss components.

The narrower finder board will take any base, including the Telrad.

Detail of the truss blocks and spider/secondary.

The nice ting about the Destiny spider is that it is spring-loaded
and easy to collimate. The observatory grade spider is VERY rigid.

Monday, May 22, 2017

More on Keith's Upper Tube Assembly . . .

Keith's UTA is coming along nicely. Here the focuser and finder boards
are in place. The "enclosure" is in place as well.

Sunday, May 21, 2017

Keith's 17.5" F4.5 UTA . . .

Beginnings of Keith's Upper Tube Assembly for his
17.5" F4.5 These are the focuser and finder boards.

Destiny Observatory Grade Spider. Nice and solid.

Thursday, May 18, 2017

Tuesday, May 16, 2017

John and His 7" Refractor . . .

Here's John's 7" F15  refractor on the mount head I built for him
John lives in Richmond, Virginia.
.

The original mount had undersize altitude bearings and made
it difficult to manage the telescope.

Monday, May 15, 2017

A Couple of Telescopes . . .

Regardless of the telescope, it starts out as a 30"x30" piece of Baltic birch.

On the Left are the OTA rings for Keith's 17.5" truss telescope. the truss
telescope will sport a full upper tube assembly. on the right 
are the OTA rings for Bob's 16" string-strut telescope.

Saturday, May 13, 2017

Wednesday, May 10, 2017

12.5" F4.8 for Harry, 99.9% Complete . . .

Harry'2 12.5" string-strut telescope is complete. I only need to make the travel
struts. The fit and finish and just great. Easy motions, nice balance.
 
The 12.5" primary mirror with it's custom cover to the right. Nice!


The primary mirror sits on an all aluminum 6-point flotation mirror cell.
These cells are designed and optimized with Plop.

A 12Vdc fan is installed for help in cooling the primary mirror.

Check out the Telrad mounting system. Easy to locate and use.

The focuser is a 2" 2-speed Moonlite, a Destiny 3-vane curved-vane spider and "strings"
which, themselves, add rigidity to these strut telescopes.