Beginners scratch-build 1/72 scale working model diorama.
Peter Hausamann | 08/01/2018 09:35:01 |
![]() 48 forum posts 84 photos | Added 3 mm Masonite sheets for road base, kerbing, and footpath to span plate.
The underside has red and green navigational beacons, plus 8 contacts (shown later). To hide the wires, I decided to carve out trench to route the wires to far side of span where the framework will be. Then the wires can be attached to the framework and routed to the span hut without being too noticeable.
Then I drew up a template for the framework and started making the span frame. Used 2.5 mm bamboo skewer sticks for doweling wherever I could.
While building the frame a solution anchoring the span cables to the frame came to mind. I used half a fishing swivel attached to a bolt head.
Then I placed the span on the bridge to get an idea of how the rest of the bridge may present itself.
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I.M. OUTAHERE | 08/01/2018 17:51:39 |
1468 forum posts 3 photos | WOW! that's some nice work there Peter ! I would never have thought a swivel could be used for model making ! Have you done any other model making work ? Possibly model planes ? You seem to be very good at it ! I'm looking forward to more of your project ! Must get back up to Ballina one day for a fish also to check out the museum and your model ! ian. |
Jeff Dayman | 08/01/2018 18:29:37 |
2356 forum posts 47 photos | Hi Peter, you are doing a great job on the bridge model project and are moving right along. Thanks for sharing the pics too. JD |
Peter Hausamann | 08/01/2018 20:00:58 |
![]() 48 forum posts 84 photos | Posted by XD 351 on 08/01/2018 17:51:39:
WOW! that's some nice work there Peter ! I would never have thought a swivel could be used for model making ! Have you done any other model making work ? Possibly model planes ? You seem to be very good at it ! I'm looking forward to more of your project ! Must get back up to Ballina one day for a fish also to check out the museum and your model ! ian. Hi Ian. Another Aussie, Great! Sorry mate, no other models. This is my first. Though I have been in the RAAF, I cannot bring myself (yet) to model planes. It's not the same as the real thing. Oh, by the way. The bridge won't be in the museum for quite a few months yet. Edited By Peter Hausamann on 08/01/2018 20:02:33 |
Peter Hausamann | 08/01/2018 20:06:09 |
![]() 48 forum posts 84 photos | Posted by Jeff Dayman on 08/01/2018 18:29:37:
Hi Peter, you are doing a great job on the bridge model project and are moving right along. Thanks for sharing the pics too. JD Thanks Jeff Dayman. At the moment, I am posting photos at piecemeal rate until the progress catches up to where I am at. Then things will slow down. I came to this forum late in the project. |
Peter Hausamann | 09/01/2018 09:57:26 |
![]() 48 forum posts 84 photos | I found some springy shim metal and cut out eight contact plates. Installed the contacts, LED navigational lights, and wiring. The wires are routed to where the frame vertical beams are, so to guide the wires to the span hut.
I filled the trench work with wood putty (after I checked for electrical continuity). Then sanded and painted the span with white acrylic undercoat.
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Peter Hausamann | 10/01/2018 09:36:33 |
![]() 48 forum posts 84 photos | Luckily I came across a few photographs of Wardell Bridge via a Company that uses drones for aerial photography. Form these photos I was able to draw a plan for the span hut.
The base plan:
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Peter Hausamann | 10/01/2018 09:37:27 |
![]() 48 forum posts 84 photos | Used 3 mm MDF board for hut and gangways, and matchsticks for rail posts.
The extra board you see is the hut floor. I am going to used its edge for gluing the hut walls to. The rectangular hole is where the wiring will come up from under the span.
You can see the cable anchoring points have been inserted. I used microswitch actuator arms (the roller type) for bumper rollers. These ones are for longitudinal movements of the span. They are to stop the span from getting caught onto the towers when the span raises and lowers. On one corner is also an opto-couple used for triggering the vessel traffic lights from red to green once the span reaches its upper limit.
Edited By Peter Hausamann on 10/01/2018 09:38:46 |
Peter Hausamann | 10/01/2018 09:39:52 |
![]() 48 forum posts 84 photos | The wires got routed to the hut. Glued the wires against the framework for concealment.
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Peter Hausamann | 11/01/2018 09:29:20 |
![]() 48 forum posts 84 photos | Photograph of the bridge's bumper rollers.
Built another set of four bumper rollers but for lateral movement this time. Only used the rollers from the microswitch actuators this time.
Added the vessel traffic lights to the centre of the span.
There are several containers on the balconies. These are made from block timber and painted. Here they are drying on my window sill.
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Peter Hausamann | 12/01/2018 09:29:16 |
![]() 48 forum posts 84 photos | Used 3 mm MDF board, 2 mm clear Perspex, and white card to build the hut walls. I was surprised how well the Perspex can give that glass window effect (slight reflection and parallax error). The four tabs at top of walls is for positioning the roof. Added split bamboo skewers for railings, and fly screen for mesh. Started to paint the span with a home mixed, Bridge Grey oil enamel. Found some washers that fit over the LED nav; lights. Now they look more like beacons. To be honest, at this point of model making I felt really good on how the span turned out. |
I.M. OUTAHERE | 12/01/2018 19:48:46 |
1468 forum posts 3 photos | Peter that looks fantastic ! It's amazing how a coat of paint can bring a model to life ! Ian.
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Neil Wyatt | 12/01/2018 20:36:17 |
![]() 19226 forum posts 749 photos 86 articles | That last photo is knockout. |
Peter Hausamann | 14/01/2018 00:06:51 |
![]() 48 forum posts 84 photos | Thanks Ian and Neil for supporting comments. Added blown fuse indicators for the DC voltages. Also replaced terminal numbers with new printed ones. |
Peter Hausamann | 15/01/2018 20:19:10 |
![]() 48 forum posts 84 photos |
Doweling the framework Unbelievably, there is over 11 metres of framing put into the towers. Edited By Peter Hausamann on 15/01/2018 20:20:29 Edited By Peter Hausamann on 15/01/2018 20:20:45 |
Peter Hausamann | 16/01/2018 19:47:30 |
![]() 48 forum posts 84 photos | The pulley wheels I wanted were too expensive (to buy ten of them). So I came up with an alternative by solder-sweating different sized washers together. |
SillyOldDuffer | 16/01/2018 20:35:34 |
10668 forum posts 2415 photos | Most impressive Peter. Have you thought that your construction photos could be part of the museum display? The original bridge is interesting, your model bridge will be interesting and so is how you made it. Dave |
Peter Hausamann | 17/01/2018 19:19:48 |
![]() 48 forum posts 84 photos | Posted by SillyOldDuffer on 16/01/2018 20:35:34:
Most impressive Peter. Have you thought that your construction photos could be part of the museum display? The original bridge is interesting, your model bridge will be interesting and so is how you made it. Dave Thanks Dave for response. I don't think there will be any call or room for that at the display. There will be a background painting to this display as well (no wall space for pictures). Besides, not many modellers, who are interested in such things, are amongst the visitors to the museum. I am recording my design drawings, construction notes, troubleshooting and repair notes for a ring binder (Operating and Service Manual) as I go along. All photos are being stored on a memory stick. It will be stored in the museum library. However, any person can become a museum member ($2 annual fee) and have access to its extensive library, including the Bridge Manual (when completed). |
Peter Hausamann | 17/01/2018 19:22:41 |
![]() 48 forum posts 84 photos | Designing and constructing the pulley wheel brackets.
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Peter Hausamann | 19/01/2018 02:28:28 |
![]() 48 forum posts 84 photos | The towers are not actually in place in these photographs. They are just positioned to see how it will look, and how close the span bumpers would get to the towers.
The towers have to be installed at the same time as the road surface.
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