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PostPosted: Sun Nov 30, 2014 4:58 pm 
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S.M.S. WESPE (HENK, 1895)

History and context
The WESPE-Class armoured gun-boats of the then young Imperial German Navy were born out of a tactical concept that dated well back into the Napoleonic era. The idea was to mount a heavy long-range gun onto a highly mobile small craft that would be able to retire into shallow coastal waters, beyond the range of even the heavy artillery of an attacking fleet. The addition of a steam engine and the increase in calibre followed the development of the time, of course. Adding heavy armour to the front (mainly) was meant to give the gun-boats a certain attacking capability. It also owes something to the floating batteries used in the defence of Copenhagen during the Napoleonic wars and to the armoured floating batteries used by the allied French/British forces during the Crimean War (1854-55). In fact, adding armour plating to a (rowing) gunboat was already proposed as early as the late 18th century in Spain, as documented by a model in the Museo Naval in Madrid, but apparently never put to work in full scale.

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S.M.S. WESPE, brand-new and still without the 30.5 cm gun (1875)

At the time of the conception of the WESPE-class in the early 1870s a former cavalry(!) general was the naval chief-of-staff in Germany. The tactical dogma was ‘proactive defence’: an attacking enemy was to be awaited near home waters and fenced off. The main threat was seen in amphibian operations attacking the German coast. Thus, the landing of troops at strategic points had to be prevented. Long-range strategic and oceanic operations were out of the scope of the German naval planners of the time. There was a certain logic in this, as Germany, unlike Britain, is/was a more or less land-locked country and largely self-sufficient in many respects at that time. Overseas trade then did not have such an importance as in Britain or as in later globalising economies. Therefore, attempts to severe overseas supply chains was not so relevant. There was, indeed, active resistance from trade interest groups, particularly the merchants in the cities of Hamburg and Bremen, to a navy that would engage itself overseas. These merchants relied on their network of friendly contacts and on sailing under a neutral flag.
Hence, the WESPE-Class was designed to be mainly a heavily armoured gun-platform, giving long-range protection to the tidal North Sea harbours that are surrounded by mud-flats and to give mobile protection to the deep fjords of Schleswig-Holstein's Baltic coast. They would be backed-up by heavy artillery (and later fixed torpedo batteries) in coastal forts.
The guns in such boats usually could only be trained by turning the whole boat. This seems more difficult then it probably was, because even in the old days of the rowing gunboats they would attack by rowing in a wide circle and when the intended target passed through the line of aim, one would fire. As the WESPE-Class was designed to let themselves fall dry on mud-flats, a possibility to train the gun itself was needed.
This distinguished the WESPE-class from earlier boats of similar design in Britain, namely the ANT-, GADFLY-, and BOUNCER-class of the 1860s. Man other navies took up the same concept and there were examples in the Danish, Dutch, French, Norwegian, Spanish, and even the Argentinian navy. Some of the were armoured, while other were still constructed from wood or composite.

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S.M.S. WESPE under construction (HENK, 1895)

Technical Description
The WESPE-class comprised ten boats delivered in two batches between 1876 and 1880: WESPE (1876), VIPER, BIENE, MÜCKE, SCORPION, BASILISK, CAMAELEON, CROCODILL, SALAMANDER and NATTER. They were all built by A.G. Weser in Bremen. With a length of 46.4 m and a beam of 10.65 m they had a dead weight of 1157 t, drawing 3.37 m. The dimensions vary somewhat according to source, but this may be due to different reference points, such as length overall compared to length between the perpendicles etc.
Two inclined double-expansion engines on two propellers gave a maximum speed of 11 knots. Their original complement was 3 officers and 73 crew. Steering was from a stand on the hut and an emergency double steering wheel abaft. Very early on they were also retrofitted with an electrical generator.
The WESPE-class were the first German warships (and indeed among the first of any warship) that did completely without auxiliary sails. As the consequence they only had a light mast for signalling. In spite of sporting quite some leading edge technology, they were only of limited seaworthiness and their handling was far from perfect. This resulted in them being given a collection of rather unfavourable nicknames. They were also not very popular with their crews and officers due to the cramped conditions below decks, but then they were not meant for long voyages in the open sea.

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Admiralty illustrative drawing (before 1883)

Armament
The main armament was a single 30.5 cm rifled breech-loading gun designed and manufactured by Alfred Krupp AG in Essen. At the time the WESPE-class boats were designed, fast torpedo-boats did not exist yet – the automotive fish-torpedo was just being developed. When in the mid-1880s small torpedo-boats became a tactical reality, some form of self-defence against them was necessary and two bronce(!) 8.7 cm/l24 breech-loading guns in ‘disappearing’ carriage and two 37 mm Hotchkiss revolving guns came on board. In fact, very early on (1883) also two 35 cm underwater torpedo launching tubes were installed to increase the attacking capabilities.

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Instruction model for the Rk 30.5/l22 on the Danish HELGOLAND in the Orlogsmuseet Copenhagen on a carriage similar to that of the WESPE-Class.

Scale
The scale chosen for the model is 1/160, which admittedly is somewhat unusual for a ship model. However, the reasoning behind this choice was that a large selection of N-scale railway figures is available that eventually will crew the ship. There are also space and portability consideration, which are important for someone, who has to move from time to time for professional reasons.
The model will be a waterline model. This will allow a scenic presentation of the finished model. Besides, the hull below the waterline is not quite so graceful. Above the waterline the hull is also more or less prismatic, with vertical bulwarks and virtually no sheer. These parameters together call for a bread-and-butter construction.

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Artist’s impression of a WESPE-Class gunboat (1891)

Sources
Owing to the loss of most of the archival material from the former Admiralty Drawing Office during and after the end of WW2, detailed source material is rather scant. Some lithographed drawings that must have been made before the major refit in 1883 have survived and serve as a basis for the reconstruction. The Bundesarchiv/Militärarchiv in Freiburg i.B. has some drawings, but unfortunatelly they only pertain to a much later refit of S.M.S. NATTER. However, the WESPE-Class was a bit of a novelty at its time and some Detaildrawings of bothm the ship and the armament, have found their way into textbooks of the time. Relatively recently a very detailed original drawing of the gun became available on the Internet from a private collection (http://www.dreadnoughtproject.org). Historic photographs from the early days of the ships are quite rare and mostly of not so good quality, but some reasonably good ones from the end of their active life have survived.
Based on the information that was available in the 1980s Wolfgang Bohlayer drew and published a plan of S.M.S. WESPE as she might have looked like after the major refit in 1883 (available from VTH, http://shop.vth.de/wespe-1876.html). Based on the information available today, this plan would need to be revised in some details.
The available information is summarised on the page on the WESPE-class on my Web-site: http://www.wefalck.eu/mm/maritime/models/wespe/wespeclass.html

To be continued ...

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PostPosted: Tue Dec 02, 2014 6:14 pm 
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HI Wefalck,
I'm looking forward to watching your build. I am also building a poorly-documented Imperial German vessel in 1/160 scale. I am building in metals, which is totally new to me. I'm still acquiring and scratch-building new tools as I learn the the properties and ways of working metal.

Good Luck!

Gary

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PostPosted: Wed Dec 03, 2014 3:04 am 
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Do you have a building-log for this ?

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PostPosted: Wed Dec 03, 2014 3:15 am 
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I haven't started a build log, yet. I wanted to get something worth showing done and then backdate all of the other work. I'm working as steadily as real life will let me at the moment. However, due to Christmas, I've had to stop spending on my hobby.

When I start, it'll be in this part of the forum.

Gary

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PostPosted: Wed Dec 03, 2014 8:37 am 
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And off we go with the actual model construction …

Materials

I had been contemplating a variety of materials for the hull; for instance Plexiglas® layers with bulwarks made from brass foil. In the end, I choose MDF (medium-density fibre) board, which is available in thicknesses down to 1 mm from architectural model supply houses. Other parts will be constructed from or covered with Bristol board, which is also available in various thicknesses (or rather weights per square metre). The bulwarks etc.. will be made from Pertinax® (phenolic resin impregnated paper, FR-2), which is available in thicknesses down to 0.1 mm. Bristol board and Pertinax® are easily cut with a scalpel, a razor blade or scissors and will not crease or dent as metal foil might. I currently have no facilities for photo-etching large parts, but if I had, perhaps I would have made the bulwarks from brass still. The other advantage is that Bristol board can be readily and permanently glued using white glue. Bonds between large areas of metal foil and Plexiglas® might become detached. Pertinax® can be glued using cyano-acrylate or epoxy-resins.
While I have been shying away from thermoplastics, such as polystyrene, on account of it being suspicious to be not ‘permanent’, practical experience shows that my plastic models built over 40 years ago are still intact. So I may reconsider my position in this respect. Polystyrene, of course, has several advantageous properties. One has to be sure, however, that it is properly painted to exclude the deteriorating UV-radiation.

The hull and superstructures

The basic bread-and-butter construction of the hull is shown in the pictures below.

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Cutting out layers for the hull

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Using the drill press as a makeshift disc sander (I have since constructed one)

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Using the drill press as an improvised miniature drum sander

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The layers of the hull with the barbette and the anchor-pockets cut out

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Milling a recess into which later the rubbing strake will be inserted

To be continued ...

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PostPosted: Fri Dec 05, 2014 3:14 am 
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Greetings,

Enjoy the subject you've chosen. I love early steam, gunboats and coastal defense are some of my favorite.
Look forward to watching it develop.

Cheers

miulan


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PostPosted: Mon Dec 08, 2014 12:22 pm 
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The Barbette for the 30.5 cm Gun

The barbette mainly consists of a semi-circular breastwork armour, backed by hardwood and by an open space covered with thin plate. The latter presumably to retain splintering wood in case of an impact. Since no tube of suitable dimensions for the breastwork was to hand, I made a short, laminated one from Bristol board layers glued together with white glue. The edges were soaked in thinned white glue before being trimmed down on the lathe. The tube then was varnished with wood-filler before the edges were sanded. Finally the tube was cut into half on the fret-saw. More wood-filler was applied before final sanding. The other inside wall of the barbette were lined with Pertinax to provide a smooth surface.

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Trimming the laminated tube on the lathe

The fore-deck has been covered in a sheet of thin Bristol board and the camber of the wooden decking built up with an additional piece of board and putty (I am using fast drying bodywork putty from car repair suppliers). The anchor pockets have also been lined with thin Bristol board, but Pertinax would have been better for this.

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Tube for the barbette armour made from laminated Bristol board

All surfaces that would have been iron plating, will be covered in thin sheets of Pertinax. The necessary holes for portholes and other opening will be drilled or cut before the sheets are fixed.
In between, I had also improvised a disc-sander from a PROXXON router. In think in the meantime this manufacturer offers a small disc-sander.

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Smoothing the hull on the newly constructed disc sander

To be continued ...

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PostPosted: Wed Dec 10, 2014 1:45 pm 
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Deck Fittings
The hull taking shape, at least in its rough outline, I turned my attention to some pieces of deck fittings. I know, many modellers more or less complete the hulls etc. including the paintwork first, but as many pieces may require repeated handling and fitting on the hull, I leave these finishing touches to the end.

Bollards
The ships were fitted with four pairs of bollards of square cross section; two at the rear and two on the raised quarterdeck. Luckily a good, rather close-up photograph of the real specimen is available.

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Rear deck with emergency steering stand and other pieces of deck fittings

The bollards are milled from round brass stock. Round stock was chosen as a starting point rather than e.g. flat stock, because it can be held easily in the lathe for turning on a spigot, by which the part can be held for further machining. Otherwise it would be difficult to mount such a small part on the miller for machining on five sides. The spigot is a convenient reference for machining and for fastening the part on the model eventually.

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Indexing head on the milling machine

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Before the milling operations

From the lathe the raw part is transferred to an indexing head mounted on the milling machine. After each pass with the cutting tool, the part is turned by 90º or 180º depending on requirements. Thus a square and symmetric part is produced.

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Milling nearly completed

For a final machining step, the part is transferred back to the lathe and the dome shaped head formed using a very fine file on a roller-filing rest.

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The nearly finished bollard with the roller-filing rest in the foreground

The job is completed by rounding off the corners using a not-too-hard rubber-bonded abrasive wheel (CRATEX) in the mini-drill. Remaining machining burrs are removed by offering the part to wire brush wheel.

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The bollards on part of the working drawing

To be continued with the bases for the bollards ...

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PostPosted: Wed Dec 10, 2014 11:20 pm 
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Very nice indeed!

I love to see well executed metal work. Your machining is thoughtful.
Will there be a good amount of metal work to complete model?

miulan


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PostPosted: Thu Dec 11, 2014 12:30 am 
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Man, am I envious! Beautiful work! How long will Wespe be on completion?

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PostPosted: Fri Dec 12, 2014 5:42 pm 
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Well, the project actually started in 2006 (after many years of collecting information …), but was put on hold in 2009 due to a move from the Netherlands to France. However, I am not actually counting the time or have any targets. It takes as much time as it takes to do the best job I can do.
I am using the materials that seem most appropriate or that can be machined sufficiently well for the job. Sometimes, there is a choice between metal and hard plastic, e.g. Plexiglas, but sometimes the choice is dictated by further steps, e.g. when parts need to soldered together, rather than e.g. glued. Also: nothing represents metal as well as - well, metal :smallsmile: So when a part on the original would be bare metal, I would use the same metal, e.g. steel, or something close, e.g. brass for bronze.

*******

The base for the double bollards were intended to be a surface-etched parts, but I was not happy with the results I produced in my simple home-etching arrangement. So I decided to make them from solid brass. Solid brass was easier to handle for machining than brass sheet. Nevertheless the envisaged machining operations prompted me to make a couple of gadgets, fixtures, for the mill and the lathe.

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Drilling of the bollard-bases in the work-holding block

Milling around the edges or on top of flat material always presents work-holding problems. Worse, if several identical parts have to be produced. Hence I divined a work-holding block with several clamps and stops running in a T-slot.

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Milling a bevel to the bollard-bases

Similarly holding small parts for cutting off on the circular saw is tricky and best done on the lathe with a special saw table clamped to the top-slide. This saw table allows parts to be safely clamped down for cutting.

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Cutting-off individual bollard-bases on a special saw-table on the watchmaker's lathe

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The three parts for each bollard (apologies for the poor picture)

The three parts of each bollards were soft-soldered together.

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Work-holding for soldering

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The finished bollards on the top-left (the other parts will be discussed later)

To be continued ...

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PostPosted: Tue Dec 16, 2014 4:12 pm 
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Anchor capstan
One component that always has puzzled me somewhat as to their manufacture in a model has been the sprocket on capstans. While the geometry on horizontal windlasses is quite simple, with suitable depressions for the chain links around the circumference, the sprocket on a capstan is a complex affair. In any case the capstan head cannot be manufactured in one piece. So I broke it down into three pieces: the spill head, the sprocket and the base drum with the pawls. The whole capstan has more pieces including four guiding rollers and a finger to pull the chain off the sprocket. The cast base on the prototype will be reproduced as a surface-etched part.

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Milling the sprocket, 1st step

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Milling the sprocket, 2nd step

The sprocket started out as a 2.5 mm brass rod taken into the dividing head and five notches were milled to produce something like a five-pointed star (these sprockets typically have five or six arms). The notches for the horizontal links were cut on the lathe with a forming tool. The sprocket then was faced and drilled to fit onto the capstan stem. The next step is cutting it off. This produces some burrs that need to be taken off. Luckily I have collected over the years almost every type of work-holding device that was ever made for the watchmakers lathe. Here the insert jewel chucks came handy to hold the 2.2 mm by 0.6 mm sprocket for facing-off.

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Cutting with a forming tool

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Facing-off the sprocket in a jewel chuck

The capstan head is a simple turning job. The curved surfaces are pre-cut with appropriate lathe tools and then finished with very fine files. Incidentally, the implement shown on the appropriate picture is a rare miniature micrometer, also coming from the watchmakers toolbox and very handy for measuring narrow recesses and the likes. They came in sets of three, the other two are a depth-micrometer and one for measuring the width of notches respectively.
Finally, the three parts are soft-soldered together.

Image
Assembled capstan head

To be continued ...

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PostPosted: Tue Dec 16, 2014 6:41 pm 
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The bollards turned out very nice. Your soldering is neat and clean.
The technique used to develop the capstan looks sound and developed a good piece. But the thing that really floors me, I believe that is a stick pin displayed next to the part?

Superb!

miulan


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PostPosted: Wed Dec 17, 2014 1:59 am 
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Yes, it is an ordinary clothes pin with a glass-head ...

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PostPosted: Wed Dec 17, 2014 1:19 pm 
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Wow!

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PostPosted: Sun Dec 21, 2014 4:36 am 
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Completing the capstan

Again the guiding rollers are a simple turning job. The shapes were produced with a free-turning graver and by rotary milling in the dividing head.

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Using a worm-driven dividing head to round-milling the head of the chain-rollers

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Using a worm-driven dividing head to round-milling the head of the chain-rollers

In the meantime various etched parts had been produced, including the base plate made up of two different superimposed parts and minuscule pawls. Also a chain separator from 0.3 mm copper wire rolled flat was produced. The various parts were soldered together.

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The etched parts for the spills

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The completed capstan (lower left corner, the grid of the cutting mat is 10 mm x 10 mm)

To be continued ...

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PostPosted: Sun Dec 28, 2014 1:32 pm 
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Chain-stoppers

One pair of chain stoppers is located immediately behind the hawse pipes as usual. A second pair is placed above the chain locker, which is located immediately in from of the armoured barbette. The bodies of the stoppers are rather complex castings, calling for some complex machining operations in model reproduction. The same basic technique as for the bollards was used. Given the complex shape, however, machining is not possible in one set-up. For certain operations the axis of the spigot has to be perpendicular to the milling machine, while for others, such as drilling it has to be parallel. For the latter and for milling the various slots, I choose to transfer the dividing head to the lathe. This has the advantage that its centre line is at the centre of the lathe spindle.

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Milling the profile of the fore chain stoppers

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Milling operations using a dividing head in the lathe

The slots were milled using a micro-tool made from a broken carbide drill, the end of which was ground flat. This results in a non-ideal clearance of 0º, while the cutting angle and side rake are that of the original drill bit. However, not much metal is removed so that this doesn't really matter here.

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Home-made milling bits made from broken carbide drills ground flat

One set of stoppers was milled from brass, while for the other one I used PMMA (PLEXIGLAS®, PERSPEX), the main reason being that I ran out of brass stock. However, genuine PLEXIGLAS®, is pleasant material to machine and easy on the tools. It holds sharp edges and it easier to see what you are doing than on the shiny brass. Acrylic paints seem to key-in well - basically it is the same molecule, of course. On the downside one may note that small and thin parts are rather brittle. Using diamond-cut carbide tools gives a nice smooth finish, but normal CV- or HSS-tools can also be used.

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Milling in an upright collet-holder on the milling machine

While for the bollards and the front pair of stoppers the spigot could be on the geometric centre of the part, making it easy to measure while machining, for the after stoppers I had to place the spigot to the centre of the pipe down to the locker, so that the concentric rounded edges could be milled. The pictures show this operation.

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Round-milling the body of the after chain-stopper using the rotary table of the milling machine

The stoppers have been completed with etched brass releasing levers, etc. The fore stoppers were also soldered to surface etched base plates.

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The completed chain-stoppers (right column, the grid of the cutting mat is 10 mm x 10 mm)

To be continued …

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PostPosted: Sun Dec 28, 2014 2:57 pm 
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Wefalck

Just picked up on this excellent build. Stunning workmanship on such a small scale. I will continue to follow the build with interest.

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PostPosted: Sun Jan 04, 2015 1:11 pm 
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Thanks :thumbs_up_1:

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Skylights, Companionways etc.

I have used two basic techniques for the construction of skylights, companioways etc., depending of the type and purpose. Skylights particularly were constructed around small blocks of Plexiglas milled to shape. Other types were constructed from strips of Pertinax. More intricate parts were etched from brass. For some of the skylights a combination of the techniques were used.

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Etched parts for skylights

Boiler-room skylight
The prototype construction of the boiler-room skylight is not completely clear from the drawings I had, so that I had to 'fudge' it a bit. First the central piece that supports the chimney was shaped from a piece of Plexiglas. The PROXXON drilling machine was abused as a milling machine to this end: a diamond-cut milling bit was taken up into a collet and the height of the machine set so that the bit reached just below the table. Now the Plexiglas part was passed free-hand along the mill. The form to be cut out was printed on a piece of paper that was stuck to the Plexiglas. It was tested against the shape of the etched grilles in order ensure a snug fit. The box around the skylight was constructed again from Pertinax.

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Shaping a Plexiglas-core for the boiler-room skylight

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The assembled boiler-room skylight

To be continued ...

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PostPosted: Fri Jan 09, 2015 4:32 pm 
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STUNNING-- very very exceptionally good workmanship--using machine tools in the time-honoured way!

Hut ab!


Truly great and an honour to see the model here!

Jim Baumann :wave_1:

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