Recent Topics      
YMR logo

You are here:  Your Model Railway Club > Model Railway Layouts. > Members Personal Layouts. > Upper Hembury GWR Branch Line To bottom of page
                 

 Moderated by: Spurno Page:  First Page Previous Page  1  2  3  4  Next Page Last Page  
Start New Topic Reply Printer Friendly

Upper Hembury GWR Branch Line - Members Personal Layouts. - Model Railway Layouts. - Your Model Railway Club
AuthorPost
 Posted: Tue Dec 14th, 2021 09:28 pm
PMQuoteReply
link to this 41st post
Sol
A modelling Moderator.


Joined: Mon Nov 28th, 2011
Location: Evanston Gardens, South Aust, Australia
Posts: 4440
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Spider Driver - superb !!!



____________________
Ron
NCE DCC ; 00 scale UK outline.
Back To Top PMQuoteReply

 Posted: Wed Dec 15th, 2021 08:34 am
PMQuoteReply
link to this 42nd post
Petermac
Admin


Joined: Sat Oct 13th, 2007
Location: Nr Bergerac, France
Posts: 19097
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Yes Sol - me too !  I forgot all about corner joists and trains.  Great little film.   :thumbs



____________________
'Petermac
Back To Top PMQuoteReply

 Posted: Wed Dec 15th, 2021 09:41 am
PMQuoteReply
link to this 43rd post
Longchap
Full Member


Joined: Wed Mar 25th, 2015
Location:  Saumur, France
Posts: 2321
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Spider Driver. +1



____________________
At 6'4'', Bill is a tall chap, then again, when horizontal he is rather long and people often used to trip over him! . . . and so a nickname was born :)

Back To Top PMQuoteReply

 Posted: Wed Dec 15th, 2021 11:59 pm
PMQuoteReply
link to this 44th post
peterm
Full Member
 

Joined: Thu Oct 18th, 2012
Location: Bongaree, Australia
Posts: 963
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Me too.



____________________
Cheers Pete.
Back To Top PMQuoteReply

 Posted: Fri Dec 17th, 2021 10:15 pm
PMQuoteReply
link to this 45th post
Barchester
Administrator


Joined: Wed Oct 18th, 2017
Location: Linlithgow, United Kingdom
Posts: 1155
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Lol Spider driver, loved it and so did the Grandkids  :thumbs



____________________
Wasnie me, a big boy did it and ran away

"Why did you volunteer ? I didn't Sir, the other three stepped backwards"
Back To Top PMQuoteReply

 Posted: Sat Dec 18th, 2021 12:16 am
PMQuoteReply
link to this 46th post
Petermac
Admin


Joined: Sat Oct 13th, 2007
Location: Nr Bergerac, France
Posts: 19097
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

I'd give up modelling Colin and concentrate on cartoons - everyone seemed to love your latest one. :thumbs :mutley :mutley



____________________
'Petermac
Back To Top PMQuoteReply

 Posted: Sat Dec 18th, 2021 12:31 am
PMQuoteReply
link to this 47th post
Colin W
Full Member


Joined: Thu May 2nd, 2019
Location: Melbourne, Australia
Posts: 1009
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

From the responses it seems many have not discovered the delights of "Miniscule". These 4-5min shorts were played on Kids TV around 2012 - 2 series must be ~160 of them.

When all the grandkids were smaller it was standard amusement for them. While not all as good as Spider Driver, there are many great ones to enjoy. The kids always loved the aerial chases (HT to Star Wars I think) when hunted / hunter zoom at terrifying speed through low level (real) vegetation or buildings. The techniques where they marry real live footage with animation are superb.

In the spirit of Christmas, please enjoy these favourites of ours, there are many more to be found in the same place.

Down The Chimney

The Grocery Store Incident

Happy Christmas everyone. U-H has been put on hold for the coming period, W-H is back in situ for some holiday ops before work recommences on the new build in the new year.



____________________
Colin

Upper Hembury GWR BLT Westown-Heathfield
WC≺ Workbench
Back To Top PMQuoteReply

 Posted: Tue Dec 21st, 2021 04:53 am
PMQuoteReply
link to this 48th post
Marty
Enjoying the Journey


Joined: Sun Oct 14th, 2007
Location: Perth, Western Australia, Australia
Posts: 6213
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Well.... that's my Christmas holiday viewing sorted out.... another Spider Driver fan....



____________________
Marty
N Gauge, GWR West Wales
Newcastle Emlyn Layout.
Newcastle Emlyn Station is "Under construction"
Back To Top PMQuoteReply

 Posted: Tue Jan 11th, 2022 09:38 am
PMQuoteReply
link to this 49th post
Colin W
Full Member


Joined: Thu May 2nd, 2019
Location: Melbourne, Australia
Posts: 1009
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

The first of various reports on what's been going on lately: 1) Installing Turnout motors on the British Finescale kits

As I was very happy with the service given by my PECO Solenoids driven by a CDU on Westown, I decided on sticking with the known, even though it has opened up some unexpected obstacles. More of those later, as in this post I wanted to share a tip I'd been given by others over on RMWeb # about making installation under the layout easier. A clever template which gives you correct alignment of the mounting screw holes on kit built turnouts.



The first pic shows the idea, the blades are centred by inserting suitable spacers, here 0.75mm PS strip as the blade gap is a modest and impressive 2mm at the tie rod. The template is designed with a pin to pass through the tie bar centre hole and sit perpendicular to the track.

Two pilot holes mark the points for the mounting holes. The next pic has these moved further out and a squaring plate glued to the template



I'd previously used outside supports but these didn't work as well keeping it square. The Mark 2 works superbly, install was dead square first time with the motor pin sitting up vertical.

The underside of the template (the Mark 1 version) will give you the rest of the story. As you can see, an old piece of PCB was cleaned up as the core of the device.



# originally from Michael Edge via St Enodoc












____________________
Colin

Upper Hembury GWR BLT Westown-Heathfield
WC≺ Workbench
Back To Top PMQuoteReply

 Posted: Sun Jan 30th, 2022 07:12 am
PMQuoteReply
link to this 50th post
Colin W
Full Member


Joined: Thu May 2nd, 2019
Location: Melbourne, Australia
Posts: 1009
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Completion of the Traverser Drive Assembly - 1


A story best told by the photos


























As the plan shows there are two merging exit lines, designed to cut down the required travel of the traverser. Here we need just 5 stopping positions and hence a maximum move of 4 to access any of the 7 lines.

Details of the mechanism to follow



____________________
Colin

Upper Hembury GWR BLT Westown-Heathfield
WC≺ Workbench
Back To Top PMQuoteReply

 Posted: Sun Jan 30th, 2022 08:24 am
PMQuoteReply
link to this 51st post
Colin W
Full Member


Joined: Thu May 2nd, 2019
Location: Melbourne, Australia
Posts: 1009
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Completion of the Traverser Drive Assembly - 2

The Technical stuff #......

The traverser is moved by a screw driven stepper motor. The motor could be positioned by sending a fixed number of pulses to it, which is best implemented with a microprocessor. Instead, we have chosen simpler, readily available circuitry with no need for programming. The motor is driven until it reaches a position where the carriage blocks the light from a selected photo-interrupter. The photo-interrupter (BPI-3C1-03) is compatible with any that use a photo-transistor output. At that point the motor stops with no overrun, measured accuracy is within 1 motor step which equals <= 0.3mm lateral position. This is perfectly adequate for purpose.

The circuitry accomplishes this as follows;

The motor is driven by a UDN2998W dual H-bridge designed to drive bipolar stepper motors, which require the coil currents to be reversed in the correct phase. If + and – can be used to designate the direction of current flow, the first coil is driven ++--, while the second is -++-.The motor can be reversed by swapping the connections to either of the motor coils and is done by a Relay. The motor will run from 5V, however the UDN2998W will not, so the circuit is designed to run from 12V and 10 Ohm resistors are fitted to limit motor current.


# The details are all totally beyond my ken but if anyone is really interested I can check with the designer for his OK to share.

Once everything is installed, fine tuning of the Traverser plate is done by a simple adjustment to the locking plate which joins the plate to the moving section of the motor drive. With this design, screws could be conveniently positioned between the track lines, should the tray ever need removing for maintenance.



____________________
Colin

Upper Hembury GWR BLT Westown-Heathfield
WC&PR; Workbench
Back To Top PMQuoteReply

 Posted: Sun Jan 30th, 2022 08:50 am
PMQuoteReply
link to this 52nd post
peterm
Full Member
 

Joined: Thu Oct 18th, 2012
Location: Bongaree, Australia
Posts: 963
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Well I managed to miss this but kudos to you for even thinking of doing that, let alone trying to understand it. Those points look good too.



____________________
Cheers Pete.
Back To Top PMQuoteReply

 Posted: Sun Feb 6th, 2022 03:03 am
PMQuoteReply
link to this 53rd post
Colin W
Full Member


Joined: Thu May 2nd, 2019
Location: Melbourne, Australia
Posts: 1009
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

The Traverser Waltz

Inspired by Barry's fine efforts, I thought a short operation video of my traverser in action was overdue.

"Waltzing" to music which inspired Mr Pither on his Cycling Tour of Devon and N Cornwall #. Enjoy




# Ep.34 of Monty Python - one of only two full half hour episodes and one of my favourites. Michael Palin at his annoyingly inoffensive best.

 



____________________
Colin

Upper Hembury GWR BLT Westown-Heathfield
WC&PR; Workbench
Back To Top PMQuoteReply

 Posted: Sun Feb 6th, 2022 09:36 am
PMQuoteReply
link to this 54th post
Petermac
Admin


Joined: Sat Oct 13th, 2007
Location: Nr Bergerac, France
Posts: 19097
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

That's brilliant Colin.  Does it come back again..... :hmm



____________________
'Petermac
Back To Top PMQuoteReply

 Posted: Mon Feb 7th, 2022 12:04 am
PMQuoteReply
link to this 55th post
John Dew
Full Member


Joined: Tue Dec 1st, 2009
Location: North Vancouver, British Columbia Canada
Posts: 4719
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Hi Colin
The traverser looks fantastic and such an elegant solution to moving it from track to track. I am surprised its not been used more.

I have checked back through the thread but I can spot where you describe how the tracks are powered. Are the 7 traverser tracks powered with individually switches?

Best wishes



____________________
John
Granby III
Lenz DCC,RR&Co Gold V9 B4 Windows 10
Back To Top PMQuoteReply

 Posted: Sat Feb 12th, 2022 10:49 pm
PMQuoteReply
link to this 56th post
Colin W
Full Member


Joined: Thu May 2nd, 2019
Location: Melbourne, Australia
Posts: 1009
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Petermac wrote: That's brilliant Colin.  Does it come back again..... :hmm

Thanks Peter. There are three controls.
  • Forward / Reverse
  • A Lane selection rotary switch for the 5 positions
  • An over-ride reset switch.
The mechanism is simple and best explained by an example. Starting off with the traverser in position "3" you want to travel to "5".
1) select Fwd,  2) turn the dial as required

immediately, the motor is set up to run until photosensor #5 is interrupted, not before.

Should you have "Reverse" selected by mistake, the traverser will happy ramble along, much as Reginald Pither does on his bike through Devon #, oblivious to the misdirection since there is no #5 ahead.

However unlike Reg, there is an end stop beyond both end photosensors which stops the motor so disaster in the form of burn out is avoided.
To recover, chose the correct direction and then hit reset and the movement to #5 will be completed. It's an error you make a few times before autopilot cuts in and then you always check the direction option first!


# so appropriate given Upper Hembry's location and the nature of the traverser motion.

 



____________________
Colin

Upper Hembury GWR BLT Westown-Heathfield
WC&PR; Workbench
Back To Top PMQuoteReply

 Posted: Sat Feb 12th, 2022 11:02 pm
PMQuoteReply
link to this 57th post
Headmaster
Full Member


Joined: Sun Jun 2nd, 2013
Location: Faversham, United Kingdom
Posts: 2100
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Colin, I salute you!  
I shall be making a traverser one day (I would say soon, but I know it won't be) and it will be nothing as advanced as yours.  A great job.

Michael



____________________
Kent Coast Railway (formerly Faversham Creek)
Back To Top PMQuoteReply

 Posted: Sat Feb 12th, 2022 11:17 pm
PMQuoteReply
link to this 58th post
Colin W
Full Member


Joined: Thu May 2nd, 2019
Location: Melbourne, Australia
Posts: 1009
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

John Dew wrote: Hi Colin
The traverser looks fantastic and such an elegant solution to moving it from track to track. I am surprised its not been used more.

I have checked back through the thread but I can spot where you describe how the tracks are powered. Are the 7 traverser tracks powered with individually switches?

Best wishes

Thank you John,

The design which Graham came up with is very interesting. He has spent a very long time finding practical solutions to electronic and mechanical "challenges". These often arising when replacement of highly expensive lab kit was the only alternative, often not possible. He proudly tells of a 1970 vintage NMR# machine he maintained and we used in our postgrad days which was still working well some 45+years later.

I left the choice of design totally in his hands. It was only later I looked for mechanised traversers over in "the other place" that I found how little success people had had with using stepper motors. This AFAIK because they went the programming route to control which would be fine if you can get it right but clearly is not easy. It was why Graham specifically chose his route instead. He is planning to submit his design to an electronics magazine so I cannot supply more info.

Regarding powering the moving tray, here DCC comes truly into its element. No need for copper-clad, touching contacts etc.. All that will be needed is a short length of coiled 2 strand cable (e.g an electric razor power lead) extending the main power bus over to the tray. Wires from the bus to each track. I already power my removable goods extension over on Westown-Heathfield the same way.

# these days NMR is more familiar in a medical context as MRI. We used to use NMR to look at strange new chemicals we'd made to try and work out their structures, but that was a lifetime ago



____________________
Colin

Upper Hembury GWR BLT Westown-Heathfield
WC&PR; Workbench
Back To Top PMQuoteReply

 Posted: Sun Feb 20th, 2022 08:46 am
PMQuoteReply
link to this 59th post
Colin W
Full Member


Joined: Thu May 2nd, 2019
Location: Melbourne, Australia
Posts: 1009
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

Layout Design

One last time for YT around the planning "loop".

With hindsight, it's a good job I went back and sought wider opinions # on my BLT design because I'd not understood some key issues regarding operations. As a result my sidings have been thinned out and lengthened, they are now very close to typical prototypical settings.

The key points in summary:
1) shunting was by default "off the main"
2) There was a very long mileage Siding where large loads were managed; smaller lots going thru the Goods Shed

I'd used Wallingford as my reference where the "free length" siding metrics are as follows:
Goods Shed line (100m,1320mm  at scale);
Cattle Dock Siding (73m,960mm at scale)
Mileage siding (168m,2210mm at scale)

My revised plan shows what (with help) I've achieved which is something reasonably close to the Prototype.




# https://www.rmweb.co.uk/community/index.php?/topic/170320-upper-hembury-designing-a-gwr-branch-line-in-east-devon/







 



____________________
Colin

Upper Hembury GWR BLT Westown-Heathfield
WC&PR; Workbench
Back To Top PMQuoteReply

 Posted: Fri Feb 25th, 2022 12:05 pm
PMQuoteReply
link to this 60th post
Petermac
Admin


Joined: Sat Oct 13th, 2007
Location: Nr Bergerac, France
Posts: 19097
Status: 
Offline

My photos:
view photos in Gallery
view photos as slides

That looks excellent Colin - ooodles of operating potential there and a similar amount of scenic work all in a relatively small space.  Well designed Sir. :thumbs



____________________
'Petermac
Back To Top PMQuoteReply

This is topic ID = 16905     Current time is 05:26 pm Page:  First Page Previous Page  1  2  3  4  Next Page Last Page    
You are here:  Your Model Railway Club > Model Railway Layouts. > Members Personal Layouts. > Upper Hembury GWR Branch Line
You can type a quick reply to this topic here. Click in the box below to begin.

Or to reply to an individual post, or to include images, attachments and formatted text,
click the Quote or Reply buttons on each post above.

To start a new topic in this forum, click the Start New Topic button below.
To start a new topic in a different forum, click the Forum Jump drop-down list below.
Start New Topic

Back to top of page

           
15 Most Recent Topic

Problems with this web site? Please contact the Webmaster.

All material submitted to this web site is the responsibility of the respective contributor. By submitting material to this web site you acknowledge that you accept full responsibility for the material submitted.
Unless stated otherwise, all the material displayed on this web site, including all text, photographs, drawings and other images, is copyright and the property of the respective contributor. Registered members are welcome to use it for their own personal non-commercial modelmaking purposes. It must not be reproduced or re-published elsewhere in any form, or used commercially, without first obtaining the owner's express permission.
The owner of this web site may edit, modify or remove any content at any time without giving notice or reason.    © 2008

                 

Recent Topics Back to top of page

Powered by UltraBB 1.15 Copyright © 2007-2011 by Jim Hale and Data 1 Systems. Page design copyright © 2008-2013 Martin Wynne. Photo gallery copyright © 2009 David Williams.