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'Mysterious Moose Mountain' - pt.I - 1:35n2
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 Posted: Sun May 24th, 2015 06:30 pm
   
131st Post
Si.
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Hi Michael & Dan.

Thank you both for the info & ideas on the M.M.M track.
SUPERB loco Mr.S. ! :bg:

- - - - - - -

Pleased to hear D&RGW ties are 8"x6"x72"...
...that 5x3mm Obeche, I think has got me convinced !

Nice thing with the 3mm height (I think it's an 1/8" realy)...
...is P.C.B-ties are 1.6mm high (1/16")...
...so for the switches; I can glue 2 P.C.B-ties together...
...& BINGO ! the wood-ties & soldered ones MATCH ! :brill:

- - - - - - -

" IL-115 is + 4 thou" wider on the rail head, + 3 thou" wider on the foot & same height as IL-83."

Cheers Michael; that is great info...
...I guess the rail in my Yard of HO track, must be IL-83...
...will investigate with micrometer !

" Shinohara spikes ?  Where from please ?."

Sorry to say, I bought the Shinohara HOn3 spikes about 20 years ago !...
...from Bernie 'Victors' in Islington, London.
No idea where in the U.K they could be had now. :old dude:

- - - - - - -

There REALY IS a meteorite ! :shocked:
I'll put some pictures up in a bit.
I have quite a few 'cool rocks'...
...but the meteorite is THE COOLEST by far !

( the M.M.M.M.M.&.M.Co. could cost me a MINT in dry-lettering sheets, if they ever expand !) :f:

- - - - - - -



:moose:

Si.




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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Thu May 28th, 2015 01:08 pm
   
132nd Post
Si.
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Having spent all my 'modelling time' in the DAMN garden lately !... :f:
...I collapsed in front of the tube the other evening...
...and caught Wallace & Gromit in 'The Wrong Trousers'. :)

Gromit does the FASTEST sectional-track laying EVER in this episode... :shocked:
...as he tries to save Wallace from a psychotic loco-driving penguin !

There's a ton of top plasticine railroading action in 'The Wrong Trousers'...
...highly recommended !
(especialy for exausted brain-dead gardeners) :slow:

Anyhow, my knackered-neurons came up with the idea, that since the Mysterious Moose Mountain R.O.W now stands at 1-yard (much less than Gromits !)...
...maybe I should try and run a train ! :!:

In a momment of insanity, probably induced by too much gardening, a few years back...
...I gave away THREE train power-pack/throttles ! :Crazy:
(& a bunch of other stuff; I now wish I had)

Oh well; I did keep my D.I.Y train-throttle, which I think was made when I was 14 ! :bg:



I thought I'd dusted it off a bit better before taking the pic. ! ;)

The 'accelerate button' busted, sometime during the previous millennium...
(that's the 20th, NOT 19th-century !)
...& needed replacing (bodgeing !). :dt:

Other than that, it works great; just the job for Mysterious Moose Mountain ! :s::s::s::s::s:

Time for a bit of a refurb on the handset me-thinks.
Moooooodern 21st-century electronics has a ton of cool parts available...
...some of which I already have my beady lil' eyes on, for an UPGRADE !

:cool:

Si.

:moose:



____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Fri May 29th, 2015 10:48 pm
   
133rd Post
Si.
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The original design for this throttle, is in the (now Medieval) Kalmbach Publishing Co. book ... 'Practical Electronic Projects For Model Railroaders', by Peter J. Thorne.

In the book it's simpley called 'S.C.R Throttle' (silicon controlled rectifier).

It is an amazingly simple circuit...
...but like so many amazingly simple things; it works very well.

Mr. Thorne no doubt tweaked & perfected the operation of the throttle...
...so you don't have to.
It does exactly what it says on the tin ! :s::s::s::s::s:

The 3 commercial throttles I gave away a few years back, were OK; but not great.
Two were straight 'centre-off' H&M '70s jobs...
...and 1 was a Codar-Controls, with an interesting, but poorly operating 'momentum' feature.
It was enough however, for me to realise that 'momentum throttles' were the way forward, to what I liked for running trains.

If you haven't tried a momentum-throttle; you should check one out.
No jerky starts & stops.
The loco 'feels' like it actualy has real mass & velocity.
This S.C.R throttle also has automatic voltage-feedback...
...the power to the rails increases & decreases (not that you would notice it) with changes in the load...
...which helps the train maintain a constant speed.

Nice.



It's VINTAGE baby !

Si.

:moose:



____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Sat May 30th, 2015 05:01 am
   
134th Post
Kent K
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Si,

One word of caution on this throttle design, if you are planning on using micro motors (i.e. the expensive ones that can have gearheads installed) this is not the throttle design to use. The throttle works with pulse width modulation which will destroy the micromotors by overheating them. For the more normal types of motors used in modeling, it works great.

Kent K



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 Posted: Sun May 31st, 2015 01:16 am
   
135th Post
Si.
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Hi Kent.

Thanks for mentioning the potential issue with micro-motors.

Looking at the original construction article the other day; I was quite surprised to see that a 16-20 Volt A.C. transformer was recommended for the throttle.
Going on to say, that 25 Volt 'peaks' can occur.
There is however a 'maximum-speed' preset in the design, for adjustment.

Since the typical micro-motor user, is I guess, interested in 'scale-speed' rather than 'max-speed'; I figure the average micro-motor often doesn't get cranked-up beyond 1/2-way on a typical throttle.

Here's a link to a short P.D.F that talks about this & has a schematic for a simple non-P.W.M 'current-limited' throttle.

Micro-motor control & current-limited throttle schematic.

As is pointed out, coreless micro-motors are not great at disipating HEAT. :shocked:

- - - - - - -

Here's the track-side of the throttle.
There is a P.C.B layout in the article.
I seem to have changed it about a bit; to bring all the terminals out at one end.

It's so simple though, If I were making it today, I wouldn't bother with a P.C.B; and would use a 'tag-board' instead.



I actualy remember etching the nice wooden-floor in front of the sink, with the ferric-chloride !!
I seem to also remember, that Pops was a tad peeved about this ! :f:

Cheers.

Si.

:moose:




____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Sun May 31st, 2015 04:12 am
   
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Kent K
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Si,

It is precisely that lack of a core which contributes to the issue. The core acts as a heat sink. As for the etching in a kitchen sink, I would think that you might want to clean it up with battery acid, too (LOL)!

Kent K



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 Posted: Sun May 31st, 2015 06:50 am
   
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Si.
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Hi Kent. :wave:



I never used ferric-chloride directly in the sink (the plug was a loose fit).
I had an old ice-cream tub.
It just tended to splash about a bit.
I think it might have been youthful enthusiasm as well (no danger of that now).

I had to quit the etching years ago, for health & safety reasons...
...you might as well just have gangsters pull yer fingernails out, as mess with that soup !



I did say, if I made the throttle again now, I'd use tag-board.
But this is in fact, how stuff gets made here these days.
Just a piece of Teflon with holes drilled in it !

No blunt saws & drills, cuts with a knife, no nasty fibreglass dust, good insulation, doesn't melt, pretty cheap on fleaBay.

It's a no brainer ! :brill:

Cheers.

Si.

:moose:

P.S. Yep ... No core; no heatsink.
I guess keeping the running Voltage low, is the answer for micro-motors.
I figure the Japanese bullit-train & French T.G.V modellers probably pass on them ! ;)




____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Mon Jun 1st, 2015 05:17 am
   
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Kent K
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Si,

I feel like I'm hijacking your thread on this issue, but once again the issue with micro motors isn't the high voltage, but the spikes put out by the SCR throttle. As long as you stay within the motors voltage ranges they perform well. The heating comes into play because of the waveform put out by the SCR throttle. These motors respond to electrical current very quickly and the spikes tell them to go to maximum and then shut off several times per second. They want to see a constant voltage level or one that only changes gradually. With that I'll leave this alone unless you or someone else has specific questions. I only inserted this because it really isn't common knowledge and the micro motors ARE expensive little toys.

Kent K



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 Posted: Tue Jun 2nd, 2015 12:47 pm
   
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Si.
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" I feel like I'm hijacking your thread on this issue "

Hi Kent.

ABSOLUTELY NO WAY DUDE !

All this 'hijacking' & 'off topic' bull, that you sometimes hear people go on about...
...has never made the least bit of sense to me !

I'm here on Freerails to talk about ANYTHING to do with trains, cars, buildings, figures, model-making, sound, electrical-stuff & motors !
& most importantly...
...to have FUN and LEARN and MAKE FRIENDS.
( I just don't want to talk about The World Series & GARDENING !! )

So...
...no such thing as 'hijacking' or 'off topic' here at Mysterious Moose Mountain !
I would much rather hear from people...
...than not.

Thanks VERY MUCH Kent, for drawing the micro-motor issue to my attention.

I have been looking into the situation.
Both the throttle-design & correct micro-motor use.

I have a 'Portescap RG7' which I'm keen not to turn to carbon !!

All the best.

Cheers.

Si.

:moose:



____________________

' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
Back To Top

 Posted: Tue Jun 2nd, 2015 09:51 pm
   
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Salada
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'Evening Si,

Just back from our latest music Festival & other travels in our wonderful "global warming" summer heat (???). Ever been to a summer festival where they had to install gas heaters ??. More like global winter.

Kent is 100% correct, that little box of yours will certainly b*gger up a Portescap. Looking at your old blue capacitors (1st photo) are you sure that isn't really an old delay/reverb/echo unit ?. I'd never thought of trying to use my old Roland pedals to control a model train.

Surely "Victors" disappeared years ago ?. Dan might be onto something with his S scale sleeper suggestion. Anyone here a member of the S scale org. ?.

Cheers,               Michael

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