Search found 77 matches

by Dave Holt
Thu Apr 18, 2019 2:16 pm
Forum: Jeremy Suter
Topic: Turning a chimney
Replies: 16
Views: 889

Re: Turning a chimney

Presumably, one could use the ball cutter to remove the bulk of the material and then use a smaller cutter, file, or burr to create the smaller radius and blend in to the larger? Still looks a lot easier than trying to do it all by hand.
Dave.
by Dave Holt
Mon Apr 15, 2019 7:57 pm
Forum: Layouts and Operations
Topic: Bristol Barrow Road
Replies: 56
Views: 6894

Re: Bristol Barrow Road

Wow, Robin.
Irrespective of the double slip issue, that loco certainly runs an absolute treat. I doubt any of mine would roll along so smoothly at that speed.
Lovely.
Dave.
by Dave Holt
Fri Mar 22, 2019 8:35 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

[quote="Julian Roberts"] so the end of the superfluous mystery part 35 was just the job. Ah, yes! The mysterious parts 35. Superfluous, as you say. I think parts 35 are the counterbalance arms fitted to the reversing wey-shaft, between the frames of the prototypes. They show up on the the ...
by Dave Holt
Fri Mar 22, 2019 8:22 pm
Forum: Manchester AG
Topic: Progress with Slattocks Junction
Replies: 86
Views: 23282

Re: Progress with Slattocks Junction

Really enjoyed the visit and the chance to run some locos. Thanks to all involved. The mill looks even better in real life than in Ralph's photos and is a marvelous and evocative backdrop helping set the scene firmly in the Greater Manchester area. Wonderful day out and a great layout in the making....
by Dave Holt
Thu Mar 21, 2019 9:12 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

[quote="Julian Roberts"] Re the Ultrascale system in general, I suppose the chance of getting properly perpendicular cranks is much higher. I find that is a bit chancy with the AGW system however careful I try to be. (Edit - Philip has already mentioned this plus solution) Julian, Sorry if...
by Dave Holt
Tue Mar 19, 2019 2:43 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

It is not clear from their site whether the long or short bushes would suit. They are all inside cylinder locos. Jol Jol, The short bushes are 1.25 mm long on the bearing surface. That should be plenty just for coupling rods. I've explained earlier in the thread how I use these on unmodified Gibson...
by Dave Holt
Tue Mar 19, 2019 10:42 am
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

I doubt that the complexity of load bearing pony truck will repay the complexity they introduce with any visible improvement in the running properties of the loco, CSB fitted or otherwise. Will, We clearly have differing views on this and that's fine. The key thing is to have satisfactorily running...
by Dave Holt
Tue Mar 19, 2019 10:27 am
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

Jol, I experienced the exact same problem with my first two locos. They would run sweetly, then after disassembly and reassembly, during construction, they would bind and limp along. The loose fitting AG bushes were determined to be the problem. This appeared to be made worse if the bush was shorten...
by Dave Holt
Mon Mar 18, 2019 8:18 pm
Forum: Layouts and Operations
Topic: Brettell Road
Replies: 512
Views: 84802

Re: Brettell Road

Jim,
That's quite a transformation - toy to model. Now actually looks like a real loco.
Dave.
by Dave Holt
Mon Mar 18, 2019 3:00 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

I rarely use Ultrascale wheels, but they were supplied for a Panier chassis I did recently in EM for Pendon. I don't recall any problems using my GW wheel press, so the crank pin screws must have been secure in the wheels. On this basis, i would question whether their wheels have a 14BA clearance ho...
by Dave Holt
Mon Mar 18, 2019 11:16 am
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

Just for clarity, when i said I generally spring pony trucks, I should have said that I spring the axle in pony trucks. I don't allow the truck frame (or bogie frames from that matter) to bob up and down relative to the main frames. I don't like to see daylight between trucks/bogies and the loco cha...
by Dave Holt
Sun Mar 17, 2019 2:11 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

Julian. Yes, you're quite right; I use 14BA crank pin screws - either from the Ultrascale packs or from a bag of 100 i bought from Squires some years ago. I have to admit that I was under the impression that 14BA and M1 were sufficiently similar to be compatible, but apparently not. On the subject o...
by Dave Holt
Thu Mar 14, 2019 11:33 pm
Forum: Steam Locomotives
Topic: Locomotive fire irons
Replies: 14
Views: 930

Re: Locomotive fire irons

Ian, Thanks for that information. The table of lengths is rather interesting, particularly the range of lengths of the different items for the larger locos. I had originally assumed that they would all relate to the length of the firebox but that clearly wasn't the case for the Castle and Hall locos...
by Dave Holt
Thu Mar 14, 2019 4:05 pm
Forum: Other Buildings and Scenery
Topic: Alpha Mill
Replies: 125
Views: 15559

Re: Alpha Mill

I'm fairly sure that is the Manor - the Devon is not on a sloping site and there were no electrification cables over the boiler house as it was steam driven up to closure in 1962. I never saw the engine though I do have the maker's plate in my garage! Best Wishes,[/quote] Howard, You're absolutely r...
by Dave Holt
Tue Mar 12, 2019 8:40 pm
Forum: Other Buildings and Scenery
Topic: Alpha Mill
Replies: 125
Views: 15559

Re: Alpha Mill

I was just about to post a photo of the Regent when I saw Howard's comment. So, here is an internal view of the back end window of the Regent (by Watkins). (Don't you just wish you'd done a mill with an inverted vertical engine?) Regent eng hse rear window.jpg These are the best I can do for the Dev...
by Dave Holt
Tue Mar 12, 2019 2:55 pm
Forum: Other Buildings and Scenery
Topic: Alpha Mill
Replies: 125
Views: 15559

Re: Alpha Mill

Ralph, The engine house is looking good. As you say, with such large windows and the floor level not far below the cills of the upper windows, some sort of internal detail will be necessary. Howard's animated Saxon engine might be able to turned into CAD files and used for 3D printing of a static en...
by Dave Holt
Sun Mar 10, 2019 10:03 am
Forum: Steam Locomotives
Topic: Locomotive fire irons
Replies: 14
Views: 930

Re: Locomotive fire irons

Wasn't it the regular loss of out of gauge fireman that was more to the point? Was there a regular loss of out-of-gauge firemen? I agree that any such loss would be a very much bigger concern than the loss of equipment, but that really wasn't the issue being discussed. We are not talking about the ...
by Dave Holt
Sat Mar 09, 2019 3:53 pm
Forum: Steam Locomotives
Topic: Locomotive fire irons
Replies: 14
Views: 930

Re: Locomotive fire irons

Thanks for the thoughts and suggestions so far. The points made generally tend to confirm my original inclination, although I take Howard's point about Midland thinking on fire iron length. However, the irons on the Jubilee are copied from a photo of the loco heading a Glasgow to Manchester express,...
by Dave Holt
Fri Mar 08, 2019 2:33 pm
Forum: Steam Locomotives
Topic: Locomotive fire irons
Replies: 14
Views: 930

Locomotive fire irons

Humm..... Where does on find information about the fire irons carried on locomotives, in particular, their lengths? This question arose when I decided to make some to finish off my more recent locos for Delph/Holt. Originally, it was the recently completed Standard 2 and Fowler 3MT tanks I had in mi...
by Dave Holt
Thu Mar 07, 2019 11:09 am
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

Julian, For a brand new chassis, I thought your Crab ran very well in the video and I'm sure that any slight unevenness will quickly bed in with some running in and some lubrication. I doubt that any of my locos run any better at that stage (some probably don't ever run any better!). I'm very happy ...
by Dave Holt
Tue Mar 05, 2019 2:27 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

Philip. I've always been nervous of soldering near to plastic centred wheels, especially Alan Gibson products, which appear to have a very low melting point. I know this from bitter experience, once with a return crank and once trying to add a packer on top of an axle box to correct ride height. I t...
by Dave Holt
Tue Mar 05, 2019 2:22 pm
Forum: Steam Locomotives
Topic: Some North Eastern & LNER Locomotive Builds
Replies: 151
Views: 13752

Re: Some North Eastern & LNER Locomotive Builds

Welcome back, Mike. I was beginning to suffer withdrawal symptoms.
I'm sure you've got it right, but as B1s were left hand drive, I'm surprised the tender fire iron tunnel was on the drivers side. Was this arrangement on all the group standard tenders do you know?
Dave.
by Dave Holt
Mon Mar 04, 2019 10:59 am
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

Julian. Your shimming idea sounds a good solution to the tightening angle issue. Using the Ultrascale bush gives a longer engagement on the crank pin screw, which helps overcome the screw being too short (if they are too long, I find they won't fit into my GW wheel press). There is still a tendency ...
by Dave Holt
Sun Mar 03, 2019 3:36 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

Julian. First, you can reduce the thickness of the rivet head behind the return crank by at least half to reduce that problem. For fixing the return crank at the correct angle, do you have any Ultrascale recessed crank pin retainers - they're a headed crank pin bush with an internal 14BA thread? I u...
by Dave Holt
Sat Mar 02, 2019 1:44 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 253
Views: 27897

Re: Crab Comet conversion

David, It's not an idiot question and you're quite right that it is the valve chest drain. Generally, these are an automatic drain, which is closed by steam pressure in the valve chest and falls open when there is no pressure, unlike the cylinder drain cocks, which are opened and closed by the drive...

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