Search found 251 matches

by andrewnummelin
Mon Jan 18, 2021 7:55 pm
Forum: Coaches and NPCS
Topic: Challenges - lamp irons and footboard supports
Replies: 8
Views: 448

Re: Challenges - lamp irons and footboard supports

Gents, Thanks for the comments and suggestions: I've now got some ideas to work on. For the lamp irons I've two options - fold-up etch (to be included in a future etching project) or casting (I'll be posting questions in a different part of the Forum). This is the rough design sketch for a lamp iron...
by andrewnummelin
Sat Jan 16, 2021 1:37 pm
Forum: Coaches and NPCS
Topic: Challenges - lamp irons and footboard supports
Replies: 8
Views: 448

Challenges - lamp irons and footboard supports

I'm (after decades) progressing with building some TVR coaches using Trevor Charlton etched sides and I'm coming up to two difficult items. Firstly the lamp irons shown in the following photo and drawing: these will be vulnerable as they project out from both side and end. Does anyone supply this ty...
by andrewnummelin
Thu Dec 10, 2020 11:18 am
Forum: Tools and Techniques
Topic: 00/EM wheels turned down to 18.83 standards
Replies: 19
Views: 1930

Re: 00/EM wheels turned down to 18.83 standards

It looks to me as though the wheel is a single piece of metal with a plastic bush between it and the axel. If so, I think the best approach may be - make a mandrel to hold a wheel, rather like little and large 003.JPG - thin down the back of the flange - finish the flange by eye if you can't get hol...
by andrewnummelin
Thu Dec 03, 2020 10:22 am
Forum: Painting and Weathering
Topic: Recommend a Primer
Replies: 22
Views: 6028

Re: Recommend a Primer

For extra security I often chemically blacken metals before any painting. Do others think this a good approach or not?
by andrewnummelin
Sat Nov 21, 2020 4:24 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7125

Re: Little & Large 11 - The Socially-Distanced Challenge

The challenge is "complete". Little Now lettered (imagined, but Thomas Powell did have this type of wagon), weathered and lead sheet added, so there's nothing more to be done for the time being other than retiring to the armchair and wondering if I should plan to make a rake of similar wag...
by andrewnummelin
Sat Nov 21, 2020 4:21 pm
Forum: On My Workbench
Topic: The Socially-Distanced Challenge - Registration Thread
Replies: 47
Views: 9657

Re: The Socially-Distanced Challenge - Registration Thread - A Completion!

Perhaps not really complete, but nothing more can be done until the end of social distancing when I'll be able to take these somewhere to see if they actually stay on the track and go round corners. The little one has 7 spoke wheels with tyres way below the P4 standards of width, is very light (but ...
by andrewnummelin
Sat Nov 21, 2020 2:54 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7125

Re: Little & Large - The Socially-Distanced Challenge

Full marks for having a go at making fancy wheels but it's troubling that the design of the form tool seems to waste 3 times as much material as you use - can't you grind off the LH side, possibly at an angle just to be more economical. I hope the new Society tools won't repeat this problem......or...
by andrewnummelin
Sat Nov 21, 2020 2:49 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7125

Re: Little & Large - The Socially-Distanced Challenge

Andrew, I think Devcon is thin enough to be able to just have a smear on each segment of your centres and then to push the rims on. I normally push the rims on whilst the centre is still in the lathe so I can check that it doesn't wobble. If any glue did stray I think it would be simple to pick it ...
by andrewnummelin
Wed Nov 18, 2020 8:48 am
Forum: garethashenden
Topic: A Broad Gauge Buffalo
Replies: 7
Views: 1692

Re: A Broad Gauge Buffalo

....So I 3d printed some. Using the tires from the Gibson wheels, I designed new centers. I started with just the spokes, boss, and rim, then saved this into two files, one for the center axle and one for the outer axles. Then I added the balance weights and printed them. I had to do a revision or ...
by andrewnummelin
Tue Nov 17, 2020 12:24 pm
Forum: garethashenden
Topic: A Broad Gauge Buffalo
Replies: 7
Views: 1692

Re: A Broad Gauge Buffalo

....So I 3d printed some. Using the tires from the Gibson wheels, I designed new centers. I started with just the spokes, boss, and rim, then saved this into two files, one for the center axle and one for the outer axles. Then I added the balance weights and printed them. I had to do a revision or ...
by andrewnummelin
Thu Nov 12, 2020 8:38 am
Forum: Tools and Techniques
Topic: Scale Length Conversions
Replies: 34
Views: 1903

Re: Scale Length Conversions

Favicion now added 8-) As a go at handling fractions of an inch, I've started with a simple imperial to metric converter so you enter a length in feet, inches and fractions of an inch and get it converted to millimetres or meters... http://leyburnsolutions.com/scaleconverter/imperialtometric.php Fe...
by andrewnummelin
Wed Nov 11, 2020 10:54 am
Forum: Tools and Techniques
Topic: Scale Length Conversions
Replies: 34
Views: 1903

Re: Scale Length Conversions

May I make a few suggestions that may cause some coding "fun"? The two projects I've been working on of late have involved the use of old general arrangement drawings that are dimensioned in good old fashioned units so I ended up with a spreadsheet to take things in feet, inches and fracti...
by andrewnummelin
Wed Nov 11, 2020 10:30 am
Forum: Track and Turnouts
Topic: common crossing vee angles
Replies: 33
Views: 2450

Re: common crossing vee angles

Thank you Paul, I now have the track components in my Templot box file. If I can assemble them on your background, is it possible to send the whole plan somewhere to be printed on a roll (I have heard rumours of this)? Hi Ben, I've never done this - I use my trusty A4 laser printer and a lot of sel...
by andrewnummelin
Sat Nov 07, 2020 9:08 am
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7125

Re: Little & Large - The Socially-Distanced Challenge

Andrew, .. I don’t think any kind of superglue is strong enough for gluing tyres on. A while back I thought I’d try and save time by using Hafixs to glue tyres back on some trued up centres. It just didn’t last and there was no time for adjustment. So I went back to my usual Devcon 5 minute epoxy w...
by andrewnummelin
Fri Nov 06, 2020 12:55 pm
Forum: New Products
Topic: Who would want a form tool for re-profiling wheels?
Replies: 70
Views: 6446

Re: Who would want a form tool for re-profiling wheels?

In case it helps anyone considering this, I've included a bit on the use of a form tool in a post about my socially distanced challenge. https://www.scalefour.org/forum/viewtopic.php?f=100&t=6884#p80027 Any suggestions for improving on my approach would be more than welcome, especially as I am c...
by andrewnummelin
Fri Nov 06, 2020 12:49 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7125

Little & Large 10 - The Socially-Distanced Challenge

Is half of my challenge complete? Little All that's left to do now is the lettering, weathering and testing! little and large 036.jpg I prevaricated a long time about wheels as I hardly ever use my lathe, and am really a poor novice. In the end I decided it would be easiest to try in brass - I was p...
by andrewnummelin
Wed Nov 04, 2020 7:40 am
Forum: Lathe Work
Topic: Unimat SL spares
Replies: 11
Views: 1641

Re: Unimat SL spares

Many moons ago I was after belts for a Unimat 3 and was informed that they were just standard sized “O” rings and hence easy to source. I suspect the same may be true for the SL.
by andrewnummelin
Mon Oct 26, 2020 12:30 pm
Forum: Wagons
Topic: How can a chain securing link be made?
Replies: 11
Views: 1481

Re: How can a chain securing link be made?

I think work hardening must have happened because every attempt resulted in a fracture somewhere. One way to avoid this is to anneal the brass. This involves heating the metal to to a fairly bright red in a gas flame (a gas cooker will do for small things) and allowing it to cool slowly in air. I f...
by andrewnummelin
Mon Oct 26, 2020 12:25 pm
Forum: Wagons
Topic: How can a chain securing link be made?
Replies: 11
Views: 1481

Re: How can a chain securing link be made?

smardale wrote:I make them out of fuse wire, easy to form, easy the flatten, easy to drill....

Thanks, I'd forgotten this option - I ran out of my stock many, many years ago and can't remember when I last saw any in our local shops. I'll probably have to go on-line.
by andrewnummelin
Wed Oct 14, 2020 8:05 am
Forum: Chassis and Suspensions
Topic: CSB for a Single Driver
Replies: 50
Views: 5356

Re: CSB for a Single Driver

Will L wrote:Clearly agrees with Julian's view that you need to ensure plenty of weight on the front axle.

Most locos don’t spend all their time going in one direction...
Moveable c-of-g???????????
by andrewnummelin
Tue Oct 13, 2020 6:49 pm
Forum: Chassis and Suspensions
Topic: CSB for a Single Driver
Replies: 50
Views: 5356

Re: CSB for a Single Driver

I came across this whilst looking for something totally different but I thought it might be of some interest or amusement. It's not about CSBs but on the stability of single wheelers and is from Clark's "Railway Machinery" of 1855. His discussion may well give modellers some things to thin...
by andrewnummelin
Mon Oct 12, 2020 6:44 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7125

Little & Large 9 - The Socially-Distanced Challenge

Going forward - and preparing to pause Here's how far I've got with the large wagon. little and large 024.JPG The stanchion supports have been added as I thought these would be difficult to do with the bogies in place. For the same reason buffers and couplings have been added - a piece of spring wi...
by andrewnummelin
Mon Oct 12, 2020 5:41 pm
Forum: Wagons
Topic: How can a chain securing link be made?
Replies: 11
Views: 1481

Re: How can a chain securing link be made?

Gents, Apologies for not posting a reply earlier. I had drafted one and thought it had been uploaded but it seems to have joined the bits sacrificed to the carpet god... Thanks for the suggestions - more or less the way I have made things in the past that were much simpler (like axelguard tie rods)....
by andrewnummelin
Tue Sep 29, 2020 7:12 pm
Forum: Wagons
Topic: How can a chain securing link be made?
Replies: 11
Views: 1481

How can a chain securing link be made?

One of the things I have to sort out in my lockdown challenge is how to make the link at the base of the stanchions on a bogie bolster wagon - the load securing chains would be attached to this link. From the drawing I have I estimate that the link is one and a quarter to one and a half inches in di...
by andrewnummelin
Tue Sep 29, 2020 7:43 am
Forum: Layouts
Topic: De Graafstroom - OntraXS!
Replies: 25
Views: 1885

Re: De Graafstroom - OntraXS!

Vincent,

Thanks for the extra background - adds even more life to the layout.

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