1/72 Working Lift-Span Bridge

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1 year 8 months ago #91 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge
Designed and built servo controllers for operationg the swing-gates.




Installed the servo motors under the display table.




And while I was at it (electronics side of the project) added (direction and speed) controllers for the two DC motors (span and boat motors).


Motor shaft drifts slightly (unloaded) after switch off. This affects the sensor positions along the pulley cable systems.


Building the motor controller circuits on a single board.


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1 year 8 months ago #92 by Gary
Replied by Gary on topic 1/72 Working Lift-Span Bridge
Nice work!! Do you etch your own PCBs?



'Yea, Though I Fly Through the Valley of the Shadow of Death, I Shall Fear No Evil. For I am at 50,000 Feet and Climbing.'
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1 year 8 months ago #93 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge

Gary wrote: Nice work!! Do you etch your own PCBs?

Yes mate

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1 year 8 months ago - 1 year 8 months ago #94 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge
Painted two groups of 1/72 scale figurines (pedestrians and council workers).

Cntre row: figures 3 and 4 are the same, but 4 has been altered by amputating the free arm and relocating it (my first altered figurine). Doing this opens up all sorts of possiblities. I feel like Dr Frankenstein.
Last edit: 1 year 8 months ago by Sparky.

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1 year 8 months ago #95 by Gary
Replied by Gary on topic 1/72 Working Lift-Span Bridge
They'll do the job fine, patience you have young Sparky.
Does your local council actually dress it's workers like that? They must feel like extras for the Wiggles lol



'Yea, Though I Fly Through the Valley of the Shadow of Death, I Shall Fear No Evil. For I am at 50,000 Feet and Climbing.'
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1 year 8 months ago #96 by Michaels Models
Replied by Michaels Models on topic 1/72 Working Lift-Span Bridge
First time reading this post & like others I am lost for words.

Cheers Michael

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1 year 8 months ago #97 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge

Gary wrote: ...
Does your local council actually dress it's workers like that? They must feel like extras for the Wiggles lol

Yeah, it's high visibility clothing for working near traffic or mobile machinery. It's part of being covered by health insurance.

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1 year 8 months ago #98 by Gary
Replied by Gary on topic 1/72 Working Lift-Span Bridge
Ah, yeah I see, that makes sense.



'Yea, Though I Fly Through the Valley of the Shadow of Death, I Shall Fear No Evil. For I am at 50,000 Feet and Climbing.'
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1 year 8 months ago #99 by yak
Replied by yak on topic 1/72 Working Lift-Span Bridge
Wow :ohmy: very impressive work.

Rob

No model left behind even if it screams all the way to the display shelf!

Currently hacking away at:
1/24 Tamiya Mazda RX-7 S4
1/25 Revell Datsun 720 Kingcab
1/24 Hasegawa Mitsubishi Galant GTO MR race car


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1 year 8 months ago #100 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge
Thank you Gary and Rob for your responses.
________________________________________
What about the boat?
The boat traverses under the bridge, up and down stream, but does not turn around to come back. To stop the appearnce of a boat reversing it needs two bow sections. A boat of symmetry - so to speak.
Bought two identical boat kits from China, which came with instruction sheets in Chinese (great help that is). Played around with an image of the boat to see what the modification will look like. Never built a model before, but I guess I'll just have to follow the pictures.


I cut in half the keels, decks, and cabin walls, and stuck similar sections together. The planks were too hard to bend and glue. I knew the glue won't hold under such stress. A planking iron was too expensive, but discovered a DIY method on the Internet. It uses a tea-candle and a tin can. It worked wonders in heating and shaping the planks to suit the hull.


Drew the waterline against each bulkhead. Planked the waterline. Then filled in between with planks.


Filleted the boat like a fish. Sanded the bottom half flat and smooth.
I had added two captains at their helm.

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1 year 8 months ago #101 by Sparky
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1 year 8 months ago #102 by Bishop
Replied by Bishop on topic 1/72 Working Lift-Span Bridge
Loving this. The only question is which captain goes down with the ship?

Amateur plastic surgeon!
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1 year 8 months ago - 1 year 8 months ago #103 by Maarten
Replied by Maarten on topic 1/72 Working Lift-Span Bridge

Sparky wrote: Thank you Gary and Rob for your responses.
________________________________________
What about the boat?
The boat traverses under the bridge, up and down stream, but does not turn around to come back. To stop the appearnce of a boat reversing it needs two bow sections. A boat of symmetry - so to speak.
Bought two identical boat kits from China, which came with instruction sheets in Chinese (great help that is). Played around with an image of the boat to see what the modification will look like. Never built a model before, but I guess I'll just have to follow the pictures.



I cut in half the keels, decks, and cabin walls, and stuck similar sections together. The planks were too hard to bend and glue. I knew the glue won't hold under such stress. A planking iron was too expensive, but discovered a DIY method on the Internet. It uses a tea-candle and a tin can. It worked wonders in heating and shaping the planks to suit the hull.


Drew the waterline against each bulkhead. Planked the waterline. Then filled in between with planks.


Filleted the boat like a fish. Sanded the bottom half flat and smooth.
I had added two captains at their helm.




Ps
I am a bit disappointed that you can't read a chinese instruction sheet ;)

'' I could sense things were about to kick off, so I got out of there !''


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Last edit: 1 year 8 months ago by Maarten.
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1 year 8 months ago - 1 year 8 months ago #104 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge

Maarten wrote: ...I am a bit disappointed that you can't read a chinese instruction sheet ;)

:( Sorry about that.

:lol:

Oh, Thanks for the huge compliment.
Last edit: 1 year 8 months ago by Sparky.

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1 year 8 months ago #105 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge

Bishop wrote: Loving this. The only question is which captain goes down with the ship?

:lol: I don't know.

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1 year 8 months ago - 1 year 8 months ago #106 by Bishop
Replied by Bishop on topic 1/72 Working Lift-Span Bridge
:lol:

Amateur plastic surgeon!
Last edit: 1 year 8 months ago by Bishop.
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1 year 8 months ago #107 by Tiger
Replied by Tiger on topic 1/72 Working Lift-Span Bridge
Cranking along there Sparky.
Looking awesome
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1 year 8 months ago #108 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge
Painted four larger life-savers to look like bumper tyres. Added bits of copper wire to doors for hinges. Stained doors and cabin roofs with coloured ink and a coat of satin enamel. Added a sitting figurine with a piece of string to look as if splicing rope.



Applied some wood putty and sanded the hull smooth, which will be painted later on.
Made some small eyelets for rigging.



Made hand-railing and attached them to cabin roof.

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1 year 8 months ago #109 by Bishop
Replied by Bishop on topic 1/72 Working Lift-Span Bridge
NICE!!

Amateur plastic surgeon!
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1 year 8 months ago #110 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge
The boat has two sets of navigational lights. Both for up and downstream indication.


Mast light.


Discovered that the front cabin wall was too thin to block the interior lighting.
A reflective blind was made to stop the light and reflect it back into the wheelhouse.
Both sets of red-green LEDs were installed.


Stern lights, nav light hoods, and a radar antenna installed.
You can see that along one side is a set of red and green lights indicating port and starboard for up and down stream travel of boat.


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1 year 8 months ago #111 by Maarten
Replied by Maarten on topic 1/72 Working Lift-Span Bridge

'' I could sense things were about to kick off, so I got out of there !''


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1 year 8 months ago #112 by Stinker
Replied by Stinker on topic 1/72 Working Lift-Span Bridge
This is awesome, especially all the electro mechanical stuff you're designing and incorporating into it.
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1 year 8 months ago #113 by Sparky
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Thank you Maarten and Stinker for your support.
____________________________________________
Added the air vents, winches, and two figurines having a chat.


Then altered a figurine to make him look as if he has tripped over (he went for a sixer).:lol:

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1 year 8 months ago #114 by Tiger
Replied by Tiger on topic 1/72 Working Lift-Span Bridge
Wow this is awesome Sparky.
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1 year 8 months ago #115 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge
The boat is to snugglty fit onto a base plate, which glides over the water surface by a millimetre or so. This plate is attached to an aluminium plate going through the table top (vane). There needs to be four wires connecting between boat and electronics under the table. Decided to use a printed circuit board (pcb) to bridge across. The tracks ought not rub against the tabletop slot. So the 1.5 mm pcb will be inbedded in the 2 mm aluminium vane.









Ordered some parts, so this portion of the project is on hold for awhile.

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1 year 8 months ago - 1 year 8 months ago #116 by Maarten
Replied by Maarten on topic 1/72 Working Lift-Span Bridge
Totally different what most of us do here on the KM,electronics,metal work and woodwork ...Fantastic stuff !!

'' I could sense things were about to kick off, so I got out of there !''


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Last edit: 1 year 8 months ago by Maarten.
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1 year 7 months ago #117 by Bishop
Replied by Bishop on topic 1/72 Working Lift-Span Bridge
What Maarten said. Really interesting to watch.

Amateur plastic surgeon!
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1 year 7 months ago - 1 year 7 months ago #118 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge

Maarten wrote: Totally different what most of us do here on the KM,electronics,metal work and woodwork ..

Thanks Maarten (and Bishop). One day I'll have to give plastics and resins a go.
_______________________________________________________________________

The boat is now completed.



Last edit: 1 year 7 months ago by Sparky.

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1 year 7 months ago #119 by Marder38
Replied by Marder38 on topic 1/72 Working Lift-Span Bridge
this is amazing Sparky totally in awe
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1 year 7 months ago #120 by Sparky
Replied by Sparky on topic 1/72 Working Lift-Span Bridge
Left hand side of the diorama is both vast and bare. It needs some attraction to bring balance to the whole.
I have a few ideas. One is to have some humourous drama happening on the bridge.
Decided to create a police scene. A tall policeman will be holding up approaching traffic from behind their broken down patrol car, as they approach the traffic lights.
Their blue car light will flash at the same time the amber traffic lights do at the start of bridge operations.



Somewhere along the riverbank will be this fisherman appearing to have caught a fish.



Really enjoyed playing Dr Frankenstein with the plastic figurines.

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