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Lumsdonia R&D Dept Workbench

Posted: Sat May 27, 2017 12:36 am
by TimberSurf
I have lots of idea's bubbling away at the back of my mind, bursting to get out and be developed. I thought I would share some of the development of these projects for the benefit of the inquisitive, rather than just creating them and shelving the completed projects in readiness for one day when I have a huge layout to fit them all on! So I will document the research and experimentation, warts and all, for your delectation.

Working Playground Swing
Working Playground Roundabout
Bend resistant lamp base
{Reserved for links to individual projects}

Re: Lumsdonia R&D Dept Workbench

Posted: Sat May 27, 2017 12:44 am
by TimberSurf
I started some individual threads for some of the past projects, but I will try to reference all in this one
To date:-

Not my thread but ended up contributing my sound projects

Alternate smoke generator

Buffer Lights

Servo driven level crossing

Track voltage Bogie tester

NCE UTP alternative

Re: Lumsdonia R&D Dept Workbench {Working Playgroung swing}

Posted: Sat May 27, 2017 12:52 am
by TimberSurf
Latest idea, very quickly thrown together as soon as my "stock" of neo magnets turned up.

Brass tube and a little magnet lost in the bluetack (will be lost under a seat and someone sitting on it)
Playgroung swing.jpg
Playgroung swing.jpg (54.04 KiB) Viewed 2236 times

The idea is to mount the rotating magnet motor and gearbox below the baseboard, I originaly thought I would have to cut a large hole and cover with thin plastic so the magnets could be close, however, the rare earth magnets are so strong, I think it may work directly under 12mm ply!

Working Playgroung swing Video

Re: Lumsdonia R&D Dept Workbench

Posted: Wed Jul 05, 2017 11:38 pm
by TimberSurf
Next on the list is a working playground roundabout. Just running it seemed a little to simple and unrealistic, so i developed a little circuit (very simple) to allow a little acceleration and a long deceleration. I could power it with PWM from my PC lighting system, but would prefer to keep that for lights and just run animation models from a separate 5v bus. I will eventually connect to a timer (10 secs on/110 secs off) or may yet drive from the lighting supply
Roundabout test.jpg
Roundabout test.jpg (38.9 KiB) Viewed 2134 times

Roundabout Video

Re: Lumsdonia R&D Dept Workbench

Posted: Thu Jul 06, 2017 12:21 am
by End2end
Some great models there Timbersurf :)
I went to look at your Servo driven level crossing but the link points to the buffer stops. Same as the link above.

Re: Lumsdonia R&D Dept Workbench

Posted: Thu Jul 06, 2017 10:57 pm
by TimberSurf
Link now fixed

Re: Lumsdonia R&D Dept Workbench

Posted: Fri Jul 14, 2017 6:47 pm
by Atso
Wow, just wow! :o :o :o 8) 8)

Re: Lumsdonia R&D Dept Workbench

Posted: Fri Jul 14, 2017 9:16 pm
by TimberSurf
Thanks Atso, but your easily impressed! Personally, I was much more impressed with the magic swing! lol
I still have to paint/mark planks on it, maybe use brass rod and bring away from the surface. I will definitely make more and refine the detail, it was more a test of the electronics to gauge the speed and deceleration than anything else.
Further details:-
I will make a bracket to hold under board and poke the shaft that's attached to the planetary motor and gearbox, through a hole. The roundabout is cunningly made with a brass tube up the middle, so will just 'drop' onto the shaft (not fixed), This means its easy to fit and maintain.

Once fitted on the layout the roundabout will be under the control of my Computer controlled (timed cycle) layout lighting system and I can drive it with PWM and set random running/length etc.

Re: Lumsdonia R&D Dept Workbench

Posted: Sat Jul 15, 2017 5:33 pm
by Atso
TimberSurf wrote:Thanks Atso, but your easily impressed!

I'm impressed by the whole lot and not so 'easily' as there is obviously a lot of thought, work and skill gone into making those work.

Re: Lumsdonia R&D Dept Workbench

Posted: Sun Jul 16, 2017 10:46 am
by TimberSurf
Atso wrote:
I'm impressed by the whole lot and not so 'easily' as there is obviously a lot of thought, work and skill gone into making those work.

Certainly some thought, to be honest, not a lot of work and very little skill. As a professional (design) Engineer, I don't consider it hard, as it's just "what I do", the benefit of 30 years of experience, makes it seem easy to me. What impresses me, is skills that I don't have, like 3D printing and hand painting lines etc.
I would love to get into 3D printing, and know enough about it, to know I would only be happy with a £2,000 plus printer! The cost is not even the problem, it's the surefire knowledge that it would take over everything (all consuming hobby) that would totally detract from my current interests!
I have the same issue with CNC, I would love one, again probably at least £800 worth, then add the laser cutter, then the water jet would never end!

Therefor it will not start, I will leave to others and drool over their offerings......impressed by their skills.....and put in a few "wow's" of my own for their efforts.....yours and Timbologist's being ones that come to mind

Re: Lumsdonia R&D Dept Workbench

Posted: Sun Jul 16, 2017 11:58 pm
by TimberSurf
Not getting much time to do modelling, been busy buying car, fixing car, holiday, and work is manic, but managed a quick hour this evening, so had a go at a second roundabout with a bit more detail

Roundabout V2.jpg
Roundabout V2.jpg (85.88 KiB) Viewed 2001 times

Roundabout version 2


Re: Lumsdonia R&D Dept Workbench (Bung lamp base)

Posted: Thu Aug 03, 2017 10:04 pm
by TimberSurf
You buy those beautiful delicate scale lights, you spend for ever stringing them all in parallel with resistors under the layout, you stand back and admire the great job, while scrutinizing the the new pools of light, you notice some other new anomaly and dive in to fix it. What was that, that just tickled your elbow???

B%^&*cks .

You have just destroyed all your hard work, by sideswiping a new lamp that wasn't there an hour ago!!!
If they are anywhere near scale, they are incredibly delicate and just begging to get a bashing!

I have often pondered using 3.5mm jack plugs (or even better for scale, 2.5mm). Quick disconnect for maintenance on the layout (if you remember to take them out) but the jack socket will have to be glued in, making the lamp rigid and the danger of bending the lamp post or jack plug is still a risk.
So I came up with an alternative, for ease of maintenance and inbuilt rigidity, anti-vibration and bend resistance!

Basically mount the post on a spring!
Not very pleasing to the eye or prototypical, so a little lateral thinking lead to rubber.

This then jumped to a fixing system that is tapered, so fits snuggly, can rotate when required to set correct attitude and is readily removable. I will solder a connector to each lamp so that once pulled up, I can detach without going under the board, this is possible, because the hole for the bung is around 6mm in diameter!

Lampost bung in-out.jpg

The Lamp assembly
Lampost bung wires out.jpg

Assembled lamp just pushes into a pre-drilled hole a little smaller than post, leave the rubber test tube bung in the freezer to make it easier to drill and ensure drill is "square" as you drill the hole

The tools
Lampost bung bits.jpg

A taper hole cutter or a step cutter can be used, just keep trying till the bung fits tightly with the top flush with the board

Another ingenious side effect, is that your base board thickness makes no difference! This works on any depth (beyond 3/4in, just drill a 6mm hole through the rest)

Re: Lumsdonia R&D Dept Workbench

Posted: Sun Aug 13, 2017 10:13 pm
by Mountain
I like the roundabout.

Re: Lumsdonia R&D Dept Workbench

Posted: Sun Aug 13, 2017 10:19 pm
by Dad-1
I could do with a roundabout !!
Love it.

Geoff T.

Re: Lumsdonia R&D Dept Workbench

Posted: Mon Aug 14, 2017 10:46 pm
by TimberSurf
The main body of the roundabout is a cast of herculite plaster (hard as marble) with a brass rod embedded in it. Rather than being made from cardboard or plasticard, it has a bit of mass, so is less inclined to be jerky.
Cheap and cheerful and highly replicable. (I'll add it to my list of saleable items for my future ambition for a mail order shop)
Next up will be a seesaw, but I need a bit of flat brass or steel for the beam, I need to scrabble through my bits to find the right size.