Search found 56 matches

by bobwallison
Fri Jul 10, 2020 12:06 pm
Forum: Track and Turnouts
Topic: Plywood sleepers
Replies: 11
Views: 603

Re: Plywood sleepers

0.8mm scales at 2.5 inches, give or take. Subtract a smidgin for the thickness of glue and it is apparant that any ballast larger than a scale 2 inches will project above the top of the sleepers - hardly realistic for the vast majority of jointed track. I started off with thin slepers and fine/"...
by bobwallison
Mon Mar 09, 2020 6:06 pm
Forum: CHEAG
Topic: CHEAG January and February meetings
Replies: 1
Views: 1344

CHEAG January and February meetings

In January we were joined by Dave Barham (of Fen End Pit fame) who presented the beginnings of his station buildings and interlocked lever frame for his new layout, Clare. The lever frame has featured elsewhere in this forum and it was very nice to get our hands on it – all very tactile. Dave has us...
by bobwallison
Tue Dec 17, 2019 1:25 pm
Forum: Starting in P4
Topic: Masokits sprung wagon units
Replies: 6
Views: 860

Re: Masokits sprung wagon units

Dave Bradwell produces etched bearing holders which allow fairly easy conversion of wagon kits to springing. You use the axleguards/boxes provided in the kit. http://traders.scalefour.org/DaveBradwell/rolling-stock/spring-plates/ They come with the usual highly informative instructions/suggestions. ...
by bobwallison
Thu Dec 12, 2019 4:56 pm
Forum: North London Group
Topic: NLG Christmas 2019 meeting
Replies: 6
Views: 802

Re: NLG Christmas 2019 meeting

Hi Dave.
It felt like the sort of unusual detail that would be based on photographic evidence.
Did the Newton Heath Jubilees have any long non-stop runs? If not, then the difficult access to the fire irons while on the road wouldn't matter.
Regards,
Bob
by bobwallison
Tue Dec 10, 2019 5:04 pm
Forum: North London Group
Topic: NLG Christmas 2019 meeting
Replies: 6
Views: 802

Re: NLG Christmas 2019 meeting

I wouldn't want to be the fireman of 45701 if he has need of the fire-irons during the course of the journey. One never knows what objects may descend from the sky to pluck him off the top of the tender.

Bob
by bobwallison
Tue Dec 10, 2019 4:59 pm
Forum: CHEAG
Topic: CHEAG - November and December
Replies: 0
Views: 1596

CHEAG - November and December

Last month we were pleased to welcome Ted and Tony of CLAG to our meeting. Ted bought along the evidence of his experiments in radio control - it was rather weird to see a P4 WD 2-8-0 wandering across a pub table, with no trackwork anywhere is sight. Maybe next time I will take along a metre of P4 t...
by bobwallison
Sun Dec 08, 2019 12:14 pm
Forum: Steam Locomotives
Topic: Jig for drilling crankpin hole
Replies: 72
Views: 5098

Re: Jig for drilling crankpin hole

No one has mentioned the Unimat, which covers all the bases - precision vertical drill, small milling machine and lathe. I've had mine about 30 years - a very good investment. Except that they are now only available secondhand? Even if one could be found at a sensible price it wouldn't seem wise fo...
by bobwallison
Sat Dec 07, 2019 6:26 pm
Forum: Baseboards and Carpentry
Topic: Reduction of noise from baseboards
Replies: 12
Views: 3295

Re: Reduction of noise from baseboards

Noise bounces off hard surfaces and reverberates around the room, but is absorbed by soft materials. When my acoustic colleagues were asked to deal with excess noise in trendy restaurants, they advised cutting down the reverberated noise by replacing hard furniture and decor with soft: it worked a t...
by bobwallison
Fri Dec 06, 2019 6:56 pm
Forum: Steam Locomotives
Topic: Jig for drilling crankpin hole
Replies: 72
Views: 5098

Re: Jig for drilling crankpin hole

PS I was in Axminster's Nuneaton store yesterday, drooling over the Proxxon lathes and milling machines. They looked much better and more user friendly than Axminster's own-branded Chinese imports, but also about twice the price! What particularly caught my eye, though, was the label on one of Axmin...
by bobwallison
Fri Dec 06, 2019 6:40 pm
Forum: Steam Locomotives
Topic: Jig for drilling crankpin hole
Replies: 72
Views: 5098

Re: Jig for drilling crankpin hole

I have a few of the Proxxon tools, including the KT70 compound table. They are all well built and a pleasure to use. The KT70 is practically the same as the table on the mf70. The mf70 looks like a super little machine, perfectly at home on a typical domestic workbench (unlike some other micro mille...
by bobwallison
Fri Dec 06, 2019 4:25 pm
Forum: Track and Turnouts
Topic: Exactoscale Fastrack
Replies: 7
Views: 1021

Re: Exactoscale Fastrack

Thanks for the responses guys - a few ideas to try out now. It's interesting that nearly everyone seems to fix the track first and ballast later. Ever since I made my own OO gauge track, I have laid track and ballasted in one operation, same as Norman Solomon, but we seem to be a dying breed in this...
by bobwallison
Fri Dec 06, 2019 4:13 pm
Forum: Steam Locomotives
Topic: Jig for drilling crankpin hole
Replies: 72
Views: 5098

Re: Jig for drilling crankpin hole

Just to add to the confusion, here is my take on David Knight's solution (with thanks for the original idea). Crankpin jig.jpg It is turned from brass so that the centre spigot is a sliding fit in the Gibson axle hole and the crankpin holes were drilled (on a vertical mill) over-size to take a steel...
by bobwallison
Thu Dec 05, 2019 6:02 pm
Forum: Track and Turnouts
Topic: Exactoscale Fastrack
Replies: 7
Views: 1021

Exactoscale Fastrack

I like Exactoscale's Fastrack and have rather a lot of it, but I find the webs between the sleepers rather troublesome. Not only do they prevent the ballast flowing nicely, but the grey ribbon of plastic is highly visible against the pale cream limestone ballast. So I think the webs need to be remov...
by bobwallison
Wed Nov 27, 2019 5:34 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 64
Views: 6389

Re: Plywood disaster

At last someone who understands structural engineering. regards Alan Ermmm ... I was a chartered structural engineer for nearly thirty years before I retired! To paraphrase the Institution's own definition, structural engineering is about designing, with economy and elegance , structures that can s...
by bobwallison
Tue Nov 26, 2019 4:59 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 64
Views: 6389

Re: Plywood disaster

Unfortunately, hardly any of the trackbed I need is straight, so cutting large boards into, say, 8 x 2 would probably lead to a lot of wasteage. But I'll cut out some templates at 1:10 scale and play around with them. I'm not sure about about a cork/foam sandwich, there is nothing rigid to fix thing...
by bobwallison
Tue Nov 26, 2019 3:31 pm
Forum: Starting in P4
Topic: Making a Start - The Peak District Midland / Monsal Dale pre 1903
Replies: 1141
Views: 185503

Re: Making a Start - The Peak District Midland / Monsal Dale pre 1903

John Hayes described in an early MRJ article (I think it was called ‘Smooth Manors’) how he produced removable brake gear. It was in MRJ 81. There was a similar article by John Hayes in MRJ 55: this was a bit more comprehensive and is the one I return to time and again for information and inspirati...
by bobwallison
Tue Nov 26, 2019 3:22 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 64
Views: 6389

Re: Plywood disaster

Tim, Many thanks for sharing your technical knowledge with us, very useful. The reason why I was exploring a new method is mainly weight. After my wife had helped me heave the last 8 x 4 sheet of 12mm MDF onto the workshop trestles, she vowed 'never again'. Plus, I really like the aesthetic appeal o...
by bobwallison
Mon Nov 25, 2019 5:44 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 64
Views: 6389

Re: Plywood disaster

Well all I can say is that I would have been utterly amazed had it NOT sagged. regards Alan Except it didn't sag, it bowed upwards. That's why it was only in contact with the supports at the outer end of the board, even though supports are provided at the usual 300mm centres. I wonder if people are...
by bobwallison
Wed Nov 20, 2019 4:14 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 64
Views: 6389

Re: Plywood disaster

You are all making these comments without any details or photos of the OP work. Properly constructed 9mm ply baseboards do not warp in this manner so I would like to see some details. Benchwork.jpg Alan, Hopefully the picture above will make things clear. The L-girders are 153mm deep overall, beare...
by bobwallison
Wed Nov 20, 2019 1:11 pm
Forum: Track and Turnouts
Topic: Compatibility of Plastic chairs
Replies: 6
Views: 978

Re: Compatibility of Plastic chairs

When I tried to use 10 year-old chairs from C&L, about 50% of them fractured when I tried to thread them on the rail - the plastic had become rather brittle, even though it had been stored in a dark cupboard since I bought them. That was six or seven years ago now, so the batch probably dated fr...
by bobwallison
Tue Nov 19, 2019 12:07 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 64
Views: 6389

Re: Plywood disaster

In this instance it would appear that it is the ply rather than the MDF which has caused the issues? So investing in the more expensive option following on from advice taken seems to have caused issues not experienced before? Or maybe I have this wrong :? No Tim, you are spot on. Whilst I agree wit...
by bobwallison
Sun Nov 17, 2019 5:43 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 64
Views: 6389

Re: Plywood disaster

Well that's sorted at last. I eventually coated the bottom surface with the same glue as the top surface, together with a polythene sheet to emulate the waterproof properties of the Exactoscale underlay on top. The ply is now restored to a very small uneven-ness, which is probably more realistic for...
by bobwallison
Tue Nov 12, 2019 12:56 pm
Forum: Starting in P4
Topic: Making a Start - The Peak District Midland / Monsal Dale pre 1903
Replies: 1141
Views: 185503

Re: Making a Start - The Peak District Midland / Monsal Dale pre 1903

I am curious to canvas peoples opinion of closed cell rigid insulation as a track base? Tim, as stated by Flymo, Gordon Gravett's articles show the way but it is crucial that you use the right stuff - and it ain't Celotex! There seem to be three types of rigid insulation commonly available: Expande...
by bobwallison
Tue Nov 12, 2019 11:40 am
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 64
Views: 6389

Re: Plywood disaster

Apologies for going off topic again, but I am failing to understand why silent running is seen as something of a holy grail. Hi Tim: noise and underlay seem inextricably linked with the form of baseboard construction, so I reckon your comments are very much on-topic. I think one's perception of mod...
by bobwallison
Mon Nov 11, 2019 6:29 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 64
Views: 6389

Re: Plywood disaster

My layout, built 6 or 7 years ago, is entirely 12mm MDF, supported at 300mm centres throughout, and has shown no sign of warping, either on the bare boards, or where foam is attached to it (with spray carpet adhesive). My experience of 12mm MDF is the same as Allan's - no warping over a period of s...

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