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  #41  
Old Yesterday, 08:57 AM
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AstroViking (Steve)
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That's a great looking dome, Anthony. I can't wait to see how the rest of your build goes.

Cheers,
V.
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  #42  
Old Yesterday, 06:31 PM
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anthony2302749
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Dome finally covered.

Today I completed the last bits to finally have the dome frame fully covered. This led me to do a bit of a clean-up and pack some tools away before I started the sanding.

Trimmed and sanded back all-over hanging plywood and lightly sand all joins. Now currently filling all joints with Builders Bog before some more sanding.

Cheers
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  #43  
Old Yesterday, 06:56 PM
Leo.G (Leo)
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That's looking very nice Anthony!
Bunnings do cut but locally none of the guys bar one I spoke to the other day understand kerf thickness, 3mm for the saw blade. I wondered for years when every job was 3mm short till I picked up on the guy reading the tape measure equally right to left and left to right. His answer was "none of the tradies complain" and I explained it wasn't their own project and what's 3mm to them or the customer but went on to explain at well over $100 for a single sheet of 12mm marine grade play I wanted it cut accurately, not 3mm short (which it was).


https://www.thehandymansdaughter.com/saw-kerf/


I guess I studied fabrication engineering along with a lot of other subjects (too much time on my hands on disability pension) and my teacher would have failed me if I failed to allow for the kerf when cutting and welding materials.


What sort of bog are you using?
Are you going to tape it first with the fibreglass tape (self adhesive) like what is used to join gyprock?
It holds the filler in much better and isn't overly expensive.
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  #44  
Old Yesterday, 07:39 PM
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anthony2302749
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Quote:
Originally Posted by AstroViking View Post
That's a great looking dome, Anthony. I can't wait to see how the rest of your build goes.

Cheers,
V.
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  #45  
Old Today, 05:24 PM
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anthony2302749
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Dome bogged and sanded

So, since yesterday the dome joints have been filled with builder's bog and allowed to set. From lunchtime today I have sanded all the joints down to a nice smooth finish ready for fiberglassing, may wait for the holidays before I start that process.

Other than the fiberglassing the shutter is the next major task. So, the plan for this stage is to cut out the appropriate quantity of plywood arcs to form the frame for the two shutters, top one rolling and the bottom one connected by a hinge, simpler to the Sirius observatory dome.

For the tracks which the top shutter will run on I plan to lay aluminium flat bar along the shutter frame opening, then a strip of timber then another layer aluminium flat to create the track for the shutter to roll on. As for the roller, I have a quantity of 20mm Flat rollers for the job.

Cheers
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  #46  
Old Today, 11:42 PM
Leo.G (Leo)
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I'm not sure if it's of any benefit to you in any way but the timber sandwiched between 2 strips of aluminium may be a little restrictive, the again it may not.
In the past with a sliding timber surface I attached the tongue out of yellow tongue particle board flooring and it gave it a nice smooth surface for the panel sliding movement up and down. It was only a sliding shelf in a complex computer table I built but with the plastic or whatever it is it made for a nice sliding finish. Bunnings sell the tongue on it's own, worth keeping in mind.
It's a polypropylene strip:
https://www.bunnings.com.au/poly-eig...eeder_p4430566



Are you going full fibreglass shell over the dome?
I don't like playing with fibreglass but have canoes and have had no choice in the past, good luck with it.
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