Search found 261 matches

by andrewnummelin
Fri Nov 06, 2020 12:49 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7766

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: 1814

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: 1648

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: 1648

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: 6093

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: 6093

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: 7766

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: 1648

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: 1648

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: 2214

Re: De Graafstroom - OntraXS!

Vincent,

Thanks for the extra background - adds even more life to the layout.
by andrewnummelin
Sun Sep 27, 2020 6:55 pm
Forum: Virtual Scaleforum
Topic: VIRTUAL SCALEFORUM & SCALEFOUR NORTH
Replies: 135
Views: 14536

Re: VIRTUAL SCALEFORUM & SCALEFOUR NORTH

A huge vote of thanks to all the people involved with creating a very special event. Also I'm sure that many people used presentation techniques that they would not have considered doing in the past - hats off to those who dared do something new. I've had a couple of very enjoyable days and, like at...
by andrewnummelin
Sat Sep 26, 2020 4:05 pm
Forum: Layouts
Topic: De Graafstroom - OntraXS!
Replies: 25
Views: 2214

Re: De Graafstroom - OntraXS!

Uitstekend! Perhaps an additional award should go on this page https://www.degraafstroom.com/nl/nieuws . I'm curious - what's the origin of the name? Google Translate's "digging stream" seems very unlikely to me! Just shown the video to my wife who commented: "Netjes, wat leuk. But wh...
by andrewnummelin
Sat Sep 26, 2020 3:12 pm
Forum: Demonstrations and Talks
Topic: Resistance soldering
Replies: 27
Views: 2333

Re: Resistance soldering

I've been using an Exactoscale RSU for many years but found your excellent presentation very useful in showing techniques that I have not employed. I'm sure I'm going to do better in future. I do have, and sometimes use, the Exactoscale base but I think David's approach is somewhat better. I find it...
by andrewnummelin
Tue Sep 22, 2020 1:17 pm
Forum: Lathe Work
Topic: Toyo ML1: any use?
Replies: 6
Views: 895

Re: Toyo ML1: any use?

Guy,
I’ve no personal experience with this but found the following link to be rather interesting:
http://www.lathes.co.uk/toyo/page3.html
The odd Morse taper suggests that finding accessories may prove to be a challenge.
At the current bid price it might be worth a gamble.
by andrewnummelin
Sun Sep 20, 2020 7:08 am
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7766

Re: Little & Large - The Socially-Distanced Challenge

Guy Rixon wrote:

This video, around 8:00, shows making a spring from scratch.

Guy,

That’s useful - very many thanks.
by andrewnummelin
Fri Sep 18, 2020 5:57 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7766

Little & Large 8 - The Socially-Distanced Challenge

Progress and a spring problem. To start to assemble the underframe I made a jig from a spare bit of steel, drilling holes to correspond to the positions of the bogie centres and the centres of the suspension rods. This was then used to hold the suspension skirts in the correct locations while solde...
by andrewnummelin
Thu Sep 10, 2020 1:28 pm
Forum: Trains: Model and Prototype
Topic: New book from the RCHS
Replies: 0
Views: 1752

New book from the RCHS

My copy of this arrived this morning and although not directly relevant to our common modelling activities I thought it would be of particular interest to at least one well known member... and anyone looking for applications for spur gears. Michael Lewis has written what I expect to be an excellent ...
by andrewnummelin
Mon Sep 07, 2020 6:29 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7766

Little & Large 7 - The Socially-Distanced Challenge

Time for an update, especially as we approach the very different end of the month special event. Little The drawing for the wheel spokes went off to Shapeways and passed the initial checks, however it turned out that the spokes were, in places, thinner that Shapeways thought would be acceptable for ...
by andrewnummelin
Sun Aug 16, 2020 6:20 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7766

Re: Little & Large - The Socially-Distanced Challenge

Following on from Guy's suggestion I've now managed to draw the spokes and centres for the coal tub wagon. The initial submission to Shapeways indicated that I have two options. Capture.JPG 1. Use polyamide (PA11) and loctite to axels and tyres. 2. Remove the centre boss and use brass, then solder t...
by andrewnummelin
Sun Aug 16, 2020 12:39 pm
Forum: Couplings
Topic: Which 3-link coupling? Please show your favourites
Replies: 21
Views: 4075

Re: Which 3-link coupling? Please show your favourites

Over the decades I've used hooks from many sources, including home made, and have come to prefer the Exactoscale stamped ones because of their superior appearance. However, as others have mentioned, etched hooks can have advantages. I thought some observations I've made may help your decisions: 1. P...
by andrewnummelin
Fri Jun 26, 2020 3:02 pm
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7766

Re: Little & Large - The Socially-Distanced Challenge

Guy, Many thanks for the very interesting and useful information. PA12 does indeed appear to be a good candidate material for this sort of application but it may be touch and go for minimum thickness - I’ll do a drawing and submit it to see how it is rated. I’ve been thinking through how to make the...
by andrewnummelin
Thu Jun 25, 2020 10:36 am
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7766

Little & Large 6 - The Socially-Distanced Challenge

Only just realised that part 5 had not been posted when it should have been and this one should have appeared yesterday. Little & Large Today is a bad day! I'm missing some bolts and will have to go out shopping, now that it's allowed. It's not just the missing bolts as some new tools have arri...
by andrewnummelin
Thu Jun 25, 2020 10:29 am
Forum: andrewnummelin
Topic: Little & Large - The Socially-Distanced Challenge
Replies: 33
Views: 7766

Little & Large 5 - The Socially-Distanced Challenge

This should have been posted on 11 th June but for some reason, probably my carelessness, it did not appear. Little The first coal box has been made - quite fiddly. The basic box was made from 2thou brass shim, being the nearest in thickness to the scale size of the prototype's 3/16". I wonder...
by andrewnummelin
Thu Jun 25, 2020 7:47 am
Forum: Track and Turnouts
Topic: A4 points out of 6 chain curves
Replies: 9
Views: 1513

Re: A4 points out of 6 chain curves

A good initiative, well done.

Based on a problem I recently had with a printer not doing exactly what it should have done, may I suggest that, if possible, you add a scale rule in both x and y directions so the accuracy of the final print can be checked.
by andrewnummelin
Sun Jun 14, 2020 11:38 am
Forum: Other Workshop Practice
Topic: A machining question.
Replies: 9
Views: 1873

Re: A machining question.

Gents, Thanks for the advice and questions that have made me think... Accuracy needed? Visually irrelevant, good enough to work - I've no idea what that means numerically! Number needed? Three (so six suspension links), so no need to think of "mass production" unless the carpet god gets ve...

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