Search found 685 matches

by Guy Rixon
Fri Jan 08, 2021 5:18 pm
Forum: Guy Rixon
Topic: D95 banana van
Replies: 28
Views: 3880

Re: D95 banana van

While thinking about how to fix the body, I drew and printed the brake assemblies. IMG_8067.JPG I was not expecting these to print well, planning to have them done at Shapeways, but took a test-print at home anyway to check clearances. In fact, the home print has worked very well. It seems the Mars ...
by Guy Rixon
Thu Jan 07, 2021 11:23 am
Forum: Track and Turnouts
Topic: 3-foot radius curves in P4
Replies: 26
Views: 2082

Re: 3-foot radius curves in P4

If I had a CNC mill, I'd consider milling bases for inset track from single-sided PCB, cutting grooves for the running and check rails and gapping the base between the rails at the same time. Assuming --- and it's a big assumption --- that this gives automatically-accurate track when the rails are s...
by Guy Rixon
Tue Dec 29, 2020 2:21 pm
Forum: Guy Rixon
Topic: D95 banana van
Replies: 28
Views: 3880

Re: D95 banana van

Last modelling from before the Christmas break and exile: the v3 chassis under a dummy, undecorated body. IMG_8039.JPG I printed the blank body to see how well it would mate with the chassis and how cleanly it would print. It was done "upside down", with the roof bearers next to the build ...
by Guy Rixon
Tue Dec 29, 2020 12:05 pm
Forum: Tools and Techniques
Topic: On-line drawing scaler
Replies: 9
Views: 956

Re: On-line drawing scaler

What file format does it handle, I already know it works on .jpg but not on .psd and it wont accept .pdf. It's the intersection of what the file-selector thinks of as an image (everything that matches the MIME type "image/*" ) and what the browser can read. Therefore, at least JPEG, GIF, ...
by Guy Rixon
Tue Dec 29, 2020 11:49 am
Forum: Tools and Techniques
Topic: On-line drawing scaler
Replies: 9
Views: 956

Re: On-line drawing scaler

I found an article on correcting perspective in photography . It lists various packages that attempt this, mainly in respect of photos of buildings. I had a try with Hugin, since it costs no money, but I find it to be broken on recent versions of MacOS. It seems to be trying to do the right kind of ...
by Guy Rixon
Tue Dec 29, 2020 9:44 am
Forum: Tools and Techniques
Topic: On-line drawing scaler
Replies: 9
Views: 956

Re: On-line drawing scaler

Deprojecting a photo is quite involved, in the cases that matter for railway photos, because the effects of the subject being at an angle are mixed up with how the light from the subject is projected onto the focal plane of the camera. I could write something that handles the tangent-plane projectio...
by Guy Rixon
Mon Dec 28, 2020 11:14 pm
Forum: Tools and Techniques
Topic: On-line drawing scaler
Replies: 9
Views: 956

On-line drawing scaler

Given a drawing and one known dimension, it's simple to extract other, unmarked lengths by scaling. One just has to do the arithmetic without errors such as multiplying by the scale factor when one should divide. Given a scan of a drawing, one also needs something to pick off the lengths in pixels. ...
by Guy Rixon
Sat Dec 19, 2020 8:56 pm
Forum: Guy Rixon
Topic: D95 banana van
Replies: 28
Views: 3880

Re: D95 banana van

The chassis has evolved a little. V1, in the previous post, tended bend (appropriately enough for a banana van), so in v2 I removed the continuous floor-slab; this stopped it warping. An attempt to put the axleguards into v2 showed that there wasn't enough clearance, and I massacred the detail parts...
by Guy Rixon
Tue Dec 15, 2020 11:53 pm
Forum: New Products
Topic: Boats. Of all shapes and sizes...
Replies: 12
Views: 1424

Re: Boats. Of all shapes and sizes...

The broader barges in the catalogue have steel hulls. To me, this suggests that they are post-WW1 and therefore "modernish" to my pre-grouping eye. Similarly, the fishing boats seem to be the kind with internal-combustion engines (MFV = Motor Fishing Vessel?), and I don't know when that ty...
by Guy Rixon
Tue Dec 15, 2020 11:40 pm
Forum: Guy Rixon
Topic: D95 banana van
Replies: 28
Views: 3880

Re: D95 banana van

IMG_8036.JPG First test-print of the underframe. This went very well, and all the elements have come out. There are some CAD errors to correct, such as one of the brake levers being too near its solebar, and I need to correct accurately for resin shrinkage, but the basic design of the part and the ...
by Guy Rixon
Tue Dec 15, 2020 9:22 am
Forum: New Products
Topic: Boats. Of all shapes and sizes...
Replies: 12
Views: 1424

Re: Boats. Of all shapes and sizes...

Very nice. The craft all look modernish to me, so one should be careful of period.
by Guy Rixon
Tue Dec 08, 2020 9:30 am
Forum: Guy Rixon
Topic: D95 banana van
Replies: 28
Views: 3880

Re: D95 banana van

A while ago, I parked this project while I sought "a different printer". I had in mind a print bureau cheaper than Shapeways, but the end result was a home resin-printer. So the banana split is on again. Currently, I'm working on the underframe and have got this far. Screenshot 2020-12-08 ...
by Guy Rixon
Sun Dec 06, 2020 1:17 pm
Forum: Trains: Model and Prototype
Topic: Adding operational interest to a engine shed layout
Replies: 15
Views: 1518

Re: Adding operational interest to a engine shed layout

"Fused fire-bars" is something that comes up in accounts of shed life.
by Guy Rixon
Sun Dec 06, 2020 12:14 pm
Forum: Guy Rixon
Topic: Socially-distanced challenge: SER 27' close-coupled stock
Replies: 20
Views: 5022

Re: Socially-distanced challenge: SER 27' close-coupled stock

A few posts ago, I wrote about making the glazing carriers from plasticard and the etched drop-light frames, mashed up in a jig. After that, there was a long hiatus while I was away from my modelling materials and then the arrival of that ultimate diversion-activity, a home resin-printer. The printe...
by Guy Rixon
Sun Nov 29, 2020 1:15 pm
Forum: Track and Turnouts
Topic: Cast bullhead rail piece
Replies: 18
Views: 1208

Re: Cast bullhead rail piece

That's fascinating to hear that there were stock clashes in the 4 curves to Cannon St. I've been searching for information on the junction for years and not read that. I assume it's because the viaduct was built for three roads originally but then had to accommodate a fourth when the Borough High S...
by Guy Rixon
Sat Nov 28, 2020 11:23 am
Forum: Wagons
Topic: Assembling Exactoscale wagon wheels.
Replies: 15
Views: 1092

Re: Assembling Exactoscale wagon wheels.

In fact, I use my square of hardboard just to secure the axle pointing vertically, not to align the the first wheel to the axle. The axle end goes into the block for the full ~3 mm depth of the board. I rely on the goodness of fit between wheel and axle and the retainer to set the first wheel true.
by Guy Rixon
Thu Nov 26, 2020 3:23 pm
Forum: Wagons
Topic: Assembling Exactoscale wagon wheels.
Replies: 15
Views: 1092

Re: Assembling Exactoscale wagon wheels.

For stage 6 of the instructions, fitting the first wheel, I plant the free end of the axle in a 1mm hole drilled in a square of hardboard. The blutack solution didn't appeal to me. A cautious man would arrange some clamping force when fixing the second wheel so that it can't rise up the axle. I've n...
by Guy Rixon
Thu Nov 19, 2020 1:44 pm
Forum: Area Groups
Topic: Area Groups and Zoom
Replies: 20
Views: 1983

Re: Area Groups and Zoom

Using the free account, once the initial 40 minutes ends, the meeting host is able to log back in and revive the meeting, such that the others can rejoin within a few minutes. It doesn't seem to require re-inviting the participants.
by Guy Rixon
Thu Nov 12, 2020 6:39 pm
Forum: Guy Rixon
Topic: Socially-distanced challenge: SER 27' close-coupled stock
Replies: 20
Views: 5022

Re: Socially-distanced challenge: SER 27' close-coupled stock

After a long hiatus, the brake parts are back from the printers and seem good to me. IMG_2025.JPG IMG_1319.JPG One print gives enough assemblies for four axles, so the cost is about £4 per coach before adding shipping. Not cheap, but for me it's worth it firstly because I am rubbish at assembling cl...
by Guy Rixon
Wed Nov 11, 2020 11:15 pm
Forum: Wagons
Topic: Bill Bedford underframe.
Replies: 10
Views: 1021

Re: Bill Bedford underframe.

I haven't built this underframe kit, but I did build a similar BB underframe that looks to have the same basic design. I'm basing these remarks on the fret image shown on the Eileen's site. If I'm reading this right, the parts bearing the axleguards locate laterally against the folded-up spring supp...
by Guy Rixon
Wed Nov 11, 2020 7:12 pm
Forum: Wagons
Topic: Bill Bedford underframe.
Replies: 10
Views: 1021

Re: Bill Bedford underframe.

It seems to carry the LNER's standard rigging for fitted wagons. That means: - probably not a pre-grouping vehicle; - probably not built after the mid '30s, when the wheelbase standard changed to 10'; - probably not built at Shildon, where wooden frames were normal until quite late. The LNER had qui...
by Guy Rixon
Tue Nov 10, 2020 4:22 pm
Forum: Tools and Techniques
Topic: Scale Length Conversions
Replies: 34
Views: 1958

Re: Scale Length Conversions

Thanks John, that's nice and neat and saves some mental arithmetic. It's traditional at this stage of the software life-cycle to respond with suggestions for extra features, so if I may? 1. It would be nice to distinguish 2FS (1:152.3) from British N, and possibly to add European/American N. Working...
by Guy Rixon
Sun Nov 08, 2020 2:22 pm
Forum: Wagons
Topic: Wagon Identity
Replies: 12
Views: 822

Re: Wagon Identity

The large fittings on the wagon door, which are also present further along the sides, look like bobbins for attaching ropes. These are seen clearly in Plate 76 of Southern Wagons v3 (showing a D1347), albeit in a different distribution along the side.
by Guy Rixon
Sat Nov 07, 2020 7:15 pm
Forum: Wagons
Topic: Wagon Identity
Replies: 12
Views: 822

Re: Wagon Identity

If the grey wagon is intended for the SECR, then it's probably a model of (SR) diagram D1345, which was the last open design of the Wainwright period. They were 16' o/h on a Fox pressed-steel frame of 9' w/b, 5 planks in the sides and with the vertical braces in the doors and the sheet rail. The bra...
by Guy Rixon
Wed Oct 14, 2020 10:41 am
Forum: Exhibitions
Topic: 17/18 October - Missenden Virtual Autumn Weekend
Replies: 10
Views: 1358

Re: 17/18 October - Missenden Virtual Autumn Weekend

Where is the page pictured in this thread? Doesn't seem to be on, or associated with the link given.

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