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  #21  
Old 21-03-2018, 05:39 PM
Kunama
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Thanks Joe, regarding the Ronchi.....I was worried about that too.....
I'll look into it after the GP......
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  #22  
Old 05-04-2018, 02:37 PM
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After a week at the F1GP in Melbourne, and Easter Festivities, I managed to get a little bit more progress on this project:

The stack of aluminium bits and pieces are now welded together and the visible external welds have been ground back ready for the powder coating, including all external edges which have been rounded over by draw-filing and sanding.

The mirror support sling linear bearings are installed on M10x110 s/s cap screws and the MoonLite truss clamps are installed (only one bolt each until their exact angle is known).

The 18pt cell is yet to be dismantled fully for some TLC on the buffer and new glide pads are yet to be installed....

Next project is the UTA which will be traditional design but with carbon struts and kevlar baffle....
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  #23  
Old 05-04-2018, 02:45 PM
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LewisM
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Beautiful job Matt - great to see no half-arsed "She'll be roit" attitude here, but a thorough approach to gratifying, meticulous attention to detail.
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  #24  
Old 05-04-2018, 03:22 PM
Stefan Buda
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Looking good - I like it.
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  #25  
Old 05-04-2018, 03:47 PM
Kunama
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Quote:
Originally Posted by LewisM View Post
Beautiful job Matt - great to see no half-arsed "She'll be roit" attitude here, but a thorough approach to gratifying, meticulous attention to detail.
Thanks Lewis, lots to do still but I expect to "First Light" it before the end of June

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Looking good - I like it.
Thanks Stefan, much appreciated
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  #26  
Old 05-04-2018, 04:17 PM
croweater (Richard)
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Nice workmanship Matt. Pleasure to look at (already). Cheers, Richard.
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  #27  
Old 07-04-2018, 07:44 AM
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Nice workmanship Matt. Pleasure to look at (already). Cheers, Richard.
Thanks Richard, slow progress at the moment, hopefully I'll get more time for this project in the coming weeks...
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  #28  
Old 14-05-2018, 09:43 AM
Kunama
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Still very slow progress while waiting for parts from China, USA and Germany.....

Here is a picture of test fitting of the truss poles and UTA frame..

also a closeup of the beautiful Aurora Precision UTA Clamps which are now installed. The truss tubes are ExelComposites JTW100 full carbon and are now epoxied into the 1.25" aluminium sleeves to which the Aurora Precision clamps attach with s/s socket screws.

While waiting for Mr Postman I decided that the Telrad should match the carbon/kevlar baffle of the UTA so it now sports 0.25mm thick blue/black kevlar/carbon gloss panels attached with 3M 468MP Transfer tape.....

Next little bit will be the focuser board which will be a 6.0mm thick full carbon panel with 0.5mm kevlar/carbon sheet bonded to the outer face .....
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Last edited by Kunama; 14-05-2018 at 09:55 AM.
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  #29  
Old 14-05-2018, 12:14 PM
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There is First Class, and then there is Kunama Class
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  #30  
Old 14-05-2018, 01:06 PM
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Wonderful Job Matt ..... 1st Class Work

Col....
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  #31  
Old 24-05-2018, 06:45 PM
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Managed to sneak out into the shed for a few hours this week:

UTA now complete

Focuser board is 3mm twill weave carbon fibre panel attached to a pair of 12mm aluminium struts that have been lightened by milling out the unseen side..

Baffle is a sheet of blue kevlar/black carbon twill weave sheet 0.5mm thick (or should that be 'thin') with high gloss epoxy on the outside and kevlar fabric on the inside... (this stuff is tough !!!, went through 3 blades just to cut the focuser hole..)

Focuser is the FTF2015BCR with integrated SIPS Paracorr

Spider is the Astrosystems Heavy Duty II with matching secondary holder with Bob's Knobs and Astrosystems 1/12 4.5"

The UTA clamps from Aurora Precision now have ratchet clamp levers replacing the round knobs to make turning them a little easier...
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  #32  
Old 24-05-2018, 07:23 PM
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Doesn't look like there is far to go now
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  #33  
Old 28-05-2018, 06:24 AM
Kunama
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Hi Colin,
Just the ALT bearings to make and then it's off to the Powder Coaters for the mirror box, rocker box and AZi bearing plate.... I am also considering removable truss pole extensions of about 120mm that once taken off will allow binoviewing without any GPC in the path...
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  #34  
Old 28-05-2018, 11:19 AM
thebonz (John)
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Sir lancelot

Just do it
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  #35  
Old 28-05-2018, 02:28 PM
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Coming along nicely Matt .... very nice infact.

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  #36  
Old 02-06-2018, 04:28 PM
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Made a new set of cable slings today:

Using prestretched 2mm s/s wire and 10mm linear bearings on s/s M10x100 cap screws, I covered the bearings with heat shrink tubing, then fitted 19mm anodised clamps and s/s turnbuckles to complete the pair.

Each sling runs from the top corner to the diagonally opposed bottom corner, crossing under the mirror, they are located in place using 19mm s/a velcro tape...

Very smooth operation, any movement of the collimation screw is seen as movement of the linear bearings...

(For those asking why?..... this design keeps the mirror perfectly centred without the need for guide posts)
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  #37  
Old 14-06-2018, 03:50 PM
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With many thanks to Stefan Buda, who very generously gave up his time to assist with the design idea and then provided the DXF files, I now have the Altitude Bearing arcs ready for the next stage.

Stefan also provided advice on the mounting plates and then drew them up on CAD overnight for me

Many thanks also to John Langridge of CALM Aluminium @ Minto, for his excellent service, water-jet cutting them out of 1/2" aluminium plate. I sent the DXF files to John on Monday and had the finished parts in Canberra first thing Wednesday at a huge saving over the local people.
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Last edited by Kunama; 21-06-2018 at 06:14 AM.
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  #38  
Old 14-06-2018, 04:01 PM
croweater (Richard)
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Looking good Matt. I hope Stefan is passing his skills down to someone because some of the stuff he is doing is amazing. Cheers Richard
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  #39  
Old 14-06-2018, 08:00 PM
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Originally Posted by croweater View Post
.......I hope Stefan is passing his skills down to someone because some of the stuff he is doing is amazing. Cheers Richard
I concur Richard
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  #40  
Old 22-06-2018, 05:07 PM
Kunama
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A little more progress this week, this time on the lower half of the scope...
Mirror box, rocker box, handles, axles and alt bearings are now at ACT Powder Coating ....
Hooray !!!

The Alt Bearings are demountable, each being held on by 3 M8x20mm Stainless steel cap screws which screw into stainless steel 'pucks' that are bolted to the sides of the mirror box,
and once they are removed the mirror box and its precious cargo drop down inside the rocker box for more compact storage....

For anyone wanting a challenge, try hand tapping threads for 18 M6x1.0mm bolts into work hardened 6mm thick 316 grade stainless steel plates......... guaranteed to test your patience !!!

(that's the theory anyways...)
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Last edited by Kunama; 22-06-2018 at 05:25 PM.
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