Sapwood Ebooks Catalog

Ted's Woodworking Plans

Teds Woodworking is not just a simple book containing a lot of plans and ideas for woodcrafts. It is rather a complete set of several books which are vital for you to become a professional. Tedswoodworking will help you deliver high quality products by telling you various tricks which the professionals use. It will expose all the technicalities that are present while creating a wood craft, and will tell you ways to perfectly get over the technicalities. You will also be told tricks to handle various issues in the woodworking process so that you create a product which is error free. The book is an amazing guide for all those who are looking to develop skills of woodworking easily. The book is available at a low cost which makes it even more attractive. After buying this book and following the woodworking plans, one will for sure become a successful woodworker. More here...

Tedswoodworking Plans Summary


4.8 stars out of 155 votes

Contents: Ebooks, Plans
Author: Ted Mcgrath
Official Website:
Price: $67.00

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My Tedswoodworking Plans Review

Highly Recommended

This is one of the best books I have read on this field. The writing style was simple and engaging. Content included was worth reading spending my precious time.

As a whole, this e-book contains everything you need to know about this subject. I would recommend it as a guide for beginners as well as experts and everyone in between.

12,000 Shed Plans

Now with hundreds of shed designs, plans, blueprints for the hobbyist and professional alike. Packed with new ideas for everything from small clock housings up to an entire stable. Over 12000 design projects and woodwork plans included for the avid woodworking fan. Tons of great shed plans projects to complete over the holiday / weekend with your family. Over 12000 design projects and woodwork plans included for the avid woodworking fan. Tons of great shed plans projects to complete over the holiday / weekend with your family. Materials lists provided so you'll know exactly what to buy. No more wasting money buying the wrong materials. More here...

12000 Shed Plans Summary

Contents: Ebook, Plans
Author: Ryan Henderson
Official Website:
Price: $37.00

Early Progress In Space

Also in 1957, during the International Geophysical Year (IGY), the USSR lofted the first artificial Earth satellite (Sputnik I) into low Earth orbit. Suddenly the focus was on catching up, and the space flight centered on vertical launch, expendable rockets and the experimental aircraft experience and capability were discarded. The USSR adapted a military intercontinental ballistic missile, the SS-6 Sapwood, to be the first launcher Clark, 1988 . That launcher had the growth potential to become the current, routinely launched Soyuz launcher. The first Sputnik weighed 150 kg, while the payload capability of the launcher was about 1,500 kg. This is launch margin The President of the United States rejected the suggestions coming from many sides to adapt military ballistic missiles, and insisted on developing a launcher sized specifically for the IGY satellite that launcher, Vanguard, had almost no margin or growth potential. There was about a 4-kg margin for the payload weight. After a...

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To avoid the plume of heat rising from the station, the three moved their base some 8 km upwind. A well-insulated laboratory (a box two meters by three) was installed in a deep trench, covered with a plywood roof, and buried in deep snow. The telescope and cell were located thirty meters downwind to avoid the heat and vibration of their diesel generator.

The Era of the Giants

Herschel initially hired forty workmen to pour a concrete foundation on which the telescope and its supporting structure could rotate to any direction in the sky. Next he designed and supervised the construction of the wood frame for the observatory. Although he did not design a roof to protect the telescope from the elements, the observatory required a complex wood structure in the shape of a pyramid to support the telescope's weight. This sixty-foot-tall structure consisted of long primary beams supported by hundreds of diagonal braces to provide sturdy support. Attached to this system of beams and braces were ladders that led to a platform at the elevated end of the telescope where Herschel could make fine adjustments to the telescope and clean it when necessary.

Using the Observatory

The design has proved very efficient. The only maintenance needed is to lubricate the wheels annually and paint the woodwork from time to time. The internal wood frame is creosoted. No replacements have been necessary and it is likely to be good for many more years to come.

Other tripod and wedge hints

A homemade template makes it much easier to center the LX200 on its tripod. This one is plywood, but cardboard would work just as well. Figure 3.7. A homemade template makes it much easier to center the LX200 on its tripod. This one is plywood, but cardboard would work just as well.

Planning the Construction

A basic design was sketched, in which the outer shell would be a shiplap timber skin over a frame of 75 mm x 50 mm (3 in x 2 in) treated pine beams. The overall shape would be a 2.8 m x 4 m (9 ft x 13 ft) rectangle with the western end roofed with a 2.8 m (9 ft) plywood dome, and the remaining eastern portion covered by a roof with a skylight. An upper floor at about 2.2 m (7 ft 3 in) height would cover the area under the dome, with access via a stairway on the north side. This construction would place the dome base-ring at about 2.7 m (9 ft) above ground level and considerably improve the field of view of the telescope, which would be badly restricted by local trees and our house if mounted at ground level.

Building the Support Structure

As the lower room is used as a workshop, extra horizontal members of 100 mm x 75 mm (4 in x 3 in) cross-section are fitted to form the supports for a workbench at each end of the structure, and these are planked over with 150 mm x 32 mm (6 in x 14 in) floorboards to give a pair of 2.8 m x 0.5 m (9ftx1ft 10 in) work surfaces. One of these is used for metal and woodworking, while the other provides a work surface for electronic design and assembly. The polar axle is supported by a 150 mm (6 in) diameter ballrace mounted in an aluminium cell on the 18 mm (4 in) thick steel polar plate of the base frame, the whole assembly being carried on a 450 mm (1 ft 6 in) square base-plate with 50 mm x 50 mm (2 in x 2 in) steel angle struts. This strong frame is needed to carry the overhanging weight of the two 320 mm (12iin) telescopes on a fork mount, which are the current occupants of the observatory. The fork is built up from 18 mm (4 in) exterior quality plywood and is designed to be both strong...

Materials and Joining Them

For most people, wood is the easiest material with which to work, being easily-available, fairly cheap, and easy to cut and drill. The term wood embraces external grade timber, which is not dried, not planed flat, and treated with a preservative which gives it a slightly greenish colour internal grade timber, which is dried, and may be unplaned or planed, but is commonly planed in the smaller sizes, and is not treated plywood, which is strong and versatile, but needs to be kept dry chipboard and fibreboard, which are most useful for flooring and roofing purposes and hardboard, which is weak, and mostly useful for lining and insulation. There are numerous possibilities for cladding the framework of an observatory, if the sides are flat. One is plywood, which is very strong, perhaps unnecessarily strong, heavy and quite expensive. In addition, it will de-laminate easily if it gets wet, so requires very good sealing using varnish or paint, and very good maintenance of those coatings. The...

Classifying and supporting different Modes of l istening

Causal listening Causal listening, which Bohme (2000) refers to as object orientated and Metz (1985) calls the sound of what , is by far the most important form of listening in film. Everything that can be seen on the screen, that can make a sound, potentially has to be heard without imposing upon the dialogue. So the first thing any sound design team does is to list the sounds that are either essential or might enhance the film. This proves often to be of great advantage to filmmakers, as it can transform the artificial into the real polystyrene rocks can have weight when rumbling towards the lead character, plywood doors become solid oak, and painted backdrops can appear animated. These sounds are commonly synchronised with the action, and provide all of the physical cues about a sound generating object, such as its mass, velocity, composition, and vibration. The film director, Robert Bresson, states that he will replace an image with a sound whenever possible as a sound always...

Man On Apollo

General Phillips's office originally planned to launch the first lunar module aboard Apollo-Saturn 206 in April 1967. Anticipating six months of checkout on the lunar module, Debus had requested a delivery date of September 1966. Development took longer than expected, however, and delivery slipped from month to month. The lunar module's arrival was still uncertain in January 1967 when KSC erected AS-206 on pad 37. In March AS-206 was taken down and replaced with AS-204, the launch vehicle from the ill-fated Apollo 1 mission.2 Lunar module 1 finally arrived on 23 June 1967. In the meantime NASA and Grumman engineers had built a plywood mockup on LC-37 to be used for facilities verification. For a simulation of the cable hookup, they bought hundreds of feet of garden hose at a hardware store and routed the garden hose cables down from the complex interfaces through the spacecraft lunar adapter. Since the first model did not carry all the extensive electrical systems of later lunar...

Productive Albeit Short Flight

Of even greater significance, potentially, was developing a clearer understanding of how such pathways are controlled at genetic levels. ''Such knowledge would allow us to manipulate or genetically engineer plants with desired metabolic traits,'' Heyenga added. ''For example, this information could be applied to the lumber industry in the production of trees with a low lignin content, greatly reducing the cost of paper production both economically and environmentally.'' Conversely, it could also be applied to improving timber quality in fast-growing softwoods, thus reducing the need to harvest slow-growing hardwoods.

Built Hemispherical Dome Glass Fibre

Wendeplatz Autos

The mould was made with plywood formers covered with chicken wire (wire mesh) and finished with builders' plaster trowelled smoothly to the curvature. It was sealed and coated with mould release. The four quadrants were made with a small lip on two edges. Without the lips the quadrants would be too floppy to handle, but care is needed not to trap the casting on the mould, making release difficult. I didn't at this stage worry about an opening. The next job was the ring-beam. Again, quarter segments were made. This was a Z (or double L) in profile (see Figure 23.2). This shape is structurally better than an angle or flat. It acts as the track and it provides surfaces for both the vertical wheels which take the load and the horizontal wheels which locate the dome sideways. It was made of double-thick glass fibre matting. The mould was made with plywood and hardboard. The four ring segments were then butt-jointed together in my garage and packed so they were level and circular. A piece...

Bob Garners Observatory CCD Imaging from a Converted London Garage

The telescope.2 Below these side-sections, he installed aluminium rails on steel brackets jutting out from the walls, running the whole length of the garage. These rails are on an approximately flat plane, whereas the roof of the garage slopes gradually towards the south end. (With a structure that had an apex roof, such a modification would be far harder.) The missing roof section was replaced with plywood sheet mounted on a steel frame, fitted with small fixed castors which run on the aluminium rail. When the observatory is not in use, the moving roof panel is held vertically against the remaining fixed asbestos sections by three wooden blocks on either side (Fig. 9.2). These blocks are graded in length so as to hold the section up against the fixed edge sections, at the general angle of slope of the roof. Thus the roof continues to drain rainwater to the south. The moving section is also secured to the wall at the south end by strong springs. of 9 mm (0.35 in.) thick plywood. These...

Telescope and Equipment

In May 1990 with the help of some friends I filled the hole with concrete and some reinforcing steel bars extending about 1 m above ground level. The pier was poured at a later date, using a moulding box made of plywood. It is 1.27 m (4 ft 2 in) high, I60mm x I60mm (1ft 2 in x 1 ft 2 in) at the base and 260 mm x 260 mm (10 in x 10 in) at the top (see Figure 18.2). Three metal screws were set into the wet concrete. They would hold the wedge of the telescope.

The Telescope Mounting

The telescope tube is built out of octagonal and circular 19mm (fin) and 12mm (2in) plywood with the centre cut out to a diameter a little larger than the mirror. Two thicknesses of 19 mm (fin) ply were used at the bottom of the tube to support the mirror cell. The outer edge of the ply takes 50 mm x 25 mm (2 in x 1 in) timber members that run the full length of the tube. Extra stiffening was added to the sides of the tube to take the declination axis shafts. The outside of the tube is covered with 3 mm (iin) ply which is

Foundations and Stabili

Telescope pier in my observatory, cast in concrete in two stainless steel cylinders (bins), with plywood shelf, and aluminium platform set in the top. Figure 5.1. Telescope pier in my observatory, cast in concrete in two stainless steel cylinders (bins), with plywood shelf, and aluminium platform set in the top.

A new era of exploration began on 4 October 1957 as Sputnik 1 began its transmissions from high above the Earth And the

America's missile programmes and its intelligence-gathering capabilities. The Redstone rockets, now under the control of the Army Ballistic Missile Agency (ABMA), were increasingly reliable, while the longer-range Atlas and Titan ICBM programmes of the Air Force and Navy were progressing well. Meanwhile, U-2 spy planes provided a good idea of the state of the R-7, or Sapwood, as it was known in the West.

Making the Glass Fibre Dome

It is essential that each master mould has at least one removable side, which can be made of 12 mm (2 in) plywood or chipboard. This allows you to release the panels from the mould. When the master moulds had hardened and were taken off the formers, they were trimmed up and the inner surfaces buffed up to a high gloss using slipwax, which also assists in releasing the panels from the mould.

Altitude Azimuth Mounts

In the past 20 years, a variation of the alt-azimuth mount called the Dob-sonian has become extremely popular among hobbyists. Dobsonian mounts are named for John Dobson, an amateur telescope maker and astronomy pop-ularizer from the San Francisco area. Back in the 1970s, Dobson began to build large-aperture Newtonian reflectors in order to see the real universe. With the optical assembly complete, he faced the difficult challenge of designing a mount strong enough to support the instrument's girth yet simple enough to be constructed from common materials using hand tools. What resulted was an offshoot of the alt-az mount. Using plywood, Formica, and Teflon, along with some glue and nails, Dobson devised a telescope mount that was capable of holding steady his huge Newtonians. Plywood is an ideal material for a telescope mount, as it has incredible strength as well as a terrific vibration-damping ability. Formica and Teflon together create smooth bearing surfaces, allowing the...

Deep Sky Observatory

I started by cutting curved 200 mm (8 in) widths of 30mm (fin) plywood from 1.2 m x 2.4m (4ft x 8 ft) sheets and positioning them on the shop floor to form a 4.8 m (16 ft) circular base. I then glued and screwed two additional plywood layers over the first one to create a strong laminated base-ring. I built the two main overhead arches using the same diameter as for

Dave Tylers A Priori Fibreglass Dome

The foundation for the dome was 10 cm (4 in.) of concrete, with a 1 m (3 ft) cube of concrete under the telescope pier. Joists were laid on the concrete, which in fact were old doorframes, and the new floor, consisting of waterproof plywood, further treated with Sadolin wood protector, is now laid on these.

Adapting Commercially Made Outbuildings

The walls of commercial sheds are generally very thin, and have a utilitarian finish inside, being just the inside of the external cladding. This could be treated, by lining the shed internally with hardboard or thin plywood. The wooden sheds manufactured by specialist suppliers are generally much better-made (and more expensive) than those sold in the main retail chains, and less remedial work would have to be done if basing an observatory on one of these. An observatory

Richard Miles Compact Remotecontrolled Photometric Facili

The telescope cover was made by Richard from 13 mm thick plywood, glued and screwed. It is in two sections. The lower section is 90 cm wide by 81 cm deep by 73 cm high (36 x 32 x 29 in.) . The base is made from two layers of 18 mm (0.7 in.) plywood bonded together, and coated with epoxy resin-based flooring compound on both sides to make a watertight seal. The walls have a 3 cm (1.2 in.) lip all round the base to allow ensure water runs off easily. The plywood base is mounted on a steel baseplate, which was made out of welded steel strips by the village blacksmith. The idea was to make it impossible for water to get into the enclosure from below, and also to minimise the incursion of small animals, especially woodlice, which are so prone to crawl through any available gap in an observatory. Hence this baseplate was mounted on four 20 mm (0.8 in.) bolts set in concrete (Fig. 9.58). The bolts are daubed with grease to dissuade climbing insects. They raise the baseplate 12 cm (4.8 in.)...

Stowage And Deployment Subsystem

Used Hops Picker Equipment

Due to the non-repeatability of the automatic deployment system, Dr. Eberhardt Rees, then Director of the Marshall Space Flight Center, instructed NASA's Structures and Propulsion Laboratory to assist Boeing in the qualification (design changes) of the automatic deployment system and also to design a 'backup' deployment system for the LRV in case the automatic system could not be qualified. MSFC structures and propulsion design personnel designed a semi-automatic LRV deployment system. The design consisted of adding a pulley on the end of a shaft with a worm gear to the existing Boeing-designed deployment system. This design meant that the LRV could be deployed under total astronaut control i.e., the astronaut could stop the deployment at any point to assess the deployment process and make corrections to the hardware as required. The MSFC design was demonstrated to John Young and Charles Duke using a plywood wall and a 1 6 gravity LRV simulator. They pulled the deployment tapes and...

Barlowed Laser Collimation

The Barlowed laser collimator is a gadget that can either be bought ready made, or produced by mating a standard laser collimator with a standard Barlow lens. If the drawtube is 31.5 mm (1.25 in.) fitting, the laser and Barlow need to have this fitting. If the drawtube is 51 mm (2 in.) fitting, an adaptor can be used, or the larger-fitting laser and Barlow can be obtained, though these are much more expensive, and do not deliver greater accuracy by this method in practice. The other accessory that is necessary is a stop with a hole in it, made from an opaque material, such as wood or plastic, that fits exactly in the lower end of the drawtube. Some experimentation will be necessary here, as the lower end of the drawtube may not have a standard eyepiece diameter. It is vital that this stop can be pushed in to the drawtube from the inner end, and that it will stay in, and not fall onto the mirrors. This stop is drilled centrally with a small hole. I made this stop for my reflector out...

Practical Rolloff Roof Observatory in Michigan USA

On the second day of construction, we put up the plywood. Originally I thought of using cheap particle wood (chipboard), covered with vinyl siding. My dad, however, talked me into using fake rough-cut 7 16 in (10 mm) plywood. This material looks like rough-cut pieces of 2inx8in (50 mm x 200 mm). As it turns out, this material is stronger than particle wood and already had a gray primer coat. We brought 13 sheets of plywood. The sheets were cut with a 2 in (50 mm) overhang on the bottom and a 6 in (150 mm) overhang on top. The top overhang turned out to be a blessing. It would end up overlapping the 4inx 4in (100mm x 100mm) roof beams, covering the caster wheels completely, thus keeping the elements out. As a bonus, this top overhang would serve to keep the roof rolling in a straight line. On the fourth day of construction, we worked on the gables. We were running short of plywood, and had to buy three more sheets. Which, as it turned out, was about how many sheets worth of scrap we...


Finally, after more than three hundred hours' labour, I lined the inside of the lower structure with 6mm (XA12 in) marine (resin-bonded) plywood to give the building a professional appearance and help prevent any dampness entering through the sides. The entire inside of the all metal dome was painted matt black to prevent any reflections.


Stopping down just involves placing an opaque screen of cardboard, thin plywood or metal, which has a hole 75-100 mm across cut in it, over the telescope's objective (Fig. 2.5). (inly the light passing through the hole is then received by the telescope. For reflectors with a secondary mirror, the hole in the screen will need to be placed off-axis so that it is not obscured by the secondary mirror. Care should be taken to ensure thai the screen is firmly attached for if it were to fall off or blow away, the full aperture of the telescope would suddenly be gathering sunlight with possibly disastrous results to the observer or instrument.

The Runoff Roof

Since the casters raise the roof 8 12 in (216 mm) off the walls the gap had to be closed to keep out the weather. We therefore installed plywood and siding under the edge of the roof, on vertical sections of 2inx4in (50mmx 100 mm) attached to the outside of the carriage. The siding on the north and south ends leaves only a quarter-inch (6 mm) gap between roof and walls and so is not a problem.

Dome Construction

Initially I proposed and planned a 3 m (10 ft) fi-breglass dome - see Ron Johnson's observatory in Chapter 11. Unfortunately materials prices rose dramatically just at the wrong time, making that option uneconomic, so I built a plywood dome instead. My plywood dome has no internal ribs and gets its strength from a rigid box beam or base-ring at the perimeter and two vertical plywood hoops supporting the up-and-over shutter (see Figure 6.2). The continuous curved box beam is made of marine plywood -the top and bottom 12 mm (W12 in) members are separated with 2.5 mm (XA18 in) ply sides and lined internally at 200 mm (8 in) intervals with 12 mm (XA12 in) thick softwood blocks called diaphragms. When glued and nailed together (with all the joints staggered) it forms an extremely strong but lightweight structure. Figure 6.2 The 1.7m Meade dome the 16-sided plywood frame is clad in sheet aluminium. Using a pocket calculator to compute its shape, I cut a master gore as a template. The gore...

Recent Developments

The equatorial fork mount, driven by an Irving 40cm (16 in) diameter worm and wheel, has a massive plywood cradle which has supported various home-made telescopes down the years (see Figure 6.3). Currently these include a 440 mm (172 in) f 4.5 Newtonian, a 260 mm (104in) f 4 reflector as a dedicated CCD

Early Achievements

One of radio astronomy's first accomplishments was confirming Van de Hulst's prediction. Harold Ewen and Edward Purcell of Harvard University's Lyman Laboratory recorded 21-centimeter (about 8-in.) hydrogen radiation from the Milky Way for the first time on March 25, 1951, using a horn antenna that they had built from plywood and copper and attached to a fourth-floor window of the laboratory. (By international convention, radio wavelengths are always given in centimeters.) The antenna was a sloping structure with a large rectangular opening that tilted upward. This shape and angle, unfortunately, made the opening a perfect funnel for rainwater, often flooding the lab during storms, and a tempting target for snowballs thrown by passing students.

Second Observatory

The 1.7 m (5 ft 6 in) diameter dome is made of rectangular 450mm (18in) wide x 1mm (1 25in) thick aluminium sheets curved over a 16-sided plywood frame. In profile the dome appears hemispherical. A piece of flexible garden hose fixed around the shutter aperture forms a tight seal to a single 450 mm (18 in) wide aluminium shutter held in place with clips. The shutter is lifted off in one piece and is set aside when observing. The dome rotates on 75 mm (3 in) diameter nylon wheels running on a plywood track topping the walls.

The Measurements

Lawrence Richardson6 described a simpler, homemade adjustable interferometer consisting of a flat grating frame which could be tilted in front of a small 4.5-inch refractor. This was the construction which served as a model for the one described here, an easy-to-build, adjustable grating micrometer. It is made of aluminium, board and plywood and is designed for use on the popular 20-cm Schmidt-Cassegrain telescopes. Needless to say the principle of the instrument can also be used on other types of telescopes.

The Dome

As with all the other parts of the observatory, the dome is constructed from wood. This is easy to work, readily available, and quite weather-resistant if treated with modern coatings. Also, the overall weight is not as great as would be the case if metal or an adequate thickness of fibreglass had been used. The first dome had been a true hemisphere and this had resulted in a lot of complicated cutting and shaping, along with the need to use large numbers of nails to maintain the distorted shape of the plywood gores. The new dome avoids this by being polygonal and so is composed of about thirty-three trapezoidal flat panels, attached to a wooden frame by brass screws, a very much simpler shape to make a set of 50 mm x 100 mm (2 in x 4 in) support beams was fitted to the top of the observatory walls to form a second square frame at 45 degrees to the main building outline. The eight-pointed, star-shaped grid of beams provided sufficient support to carry an extended circular platform of...

Finishing Touches

I have painted the dome with four coats of gloss Ronseal Woodstain, which has resisted the weather remarkably well, to date. The finish is a mid-brown wood-grain which merges with the surroundings very well, and does not seem to cause any significant thermal problems for the telescopes. It is important to varnish the inside of the dome as well, as the bare wood is likely to develop mildew spots in damp weather, and can quickly deteriorate. One coat is generally enough to prevent problems, but can be difficult to apply to the upper surfaces. This is best overcome by the use of paint pads, rather than

The Ash Dome

Ash Dome Observatory

We fully understood why the instructions emphasized the need for everything to be totally level. The base timbers of the dome walls married up to the ring beam, so we had got that right. Next we assembled the plywood walls to the dome (Fig. 5.20). There is a footpath crossing the field adjoining my house, and, as the observatory started sprouting in the air this caused us to get some funny looks (the path is now known in the village as Observatory Walk ). This circular plywood upstand looked very raw, but as the metal cladding was installed it adopted a more businesslike

Looking Back

The plywood side panels were originally varnished with polyurethane varnish, but this again will not stand sunlight (no matter what make or type, marine or otherwise). It is not possible to revarnish over the top of the old coat, and getting it off a large area is a terrible job.

The Review Board

Under authorization from the review board, ground crews carefully removed the debris on the crew couches inside the command module on 3 February. They recorded the type and location of the material removed. Then they laid a plywood shelf across the three interlocked seats so that combustion specialists could enter the command module and examine the cabin more thoroughly. On the following day they removed the plywood and the three seats. Two days after that, they suspended a plastic false floor inside the command module so that investigators could continue to examine the command module interior without aggravating the condition of the lower part of the cabin.57

Equatorial mounts

On the minus side of equatorial mounts, however, is that they are almost always larger, heavier, more expensive, and more cumbersome than altazimuth mounts. This is why the simple Dobsonian alt-az design is so popular for supporting large Newtonians. An equatorial large enough to support, say, a 12- to 14-inch f 4 reflector would probably tip the scales at close to 200 pounds, while a plywood Dobsonian mount would weigh under 50 pounds.


Seven wooden frames were assembled to form a ring wall, the eighth section being the door. Each frame carried a window. A horizontal plywood ring was constructed and fastened to the top of the window frames and the door frame. Eight weight-bearing wheel assemblies were fitted to the lower plywood ring they carry the upper plywood ring and with it the rotating roof. Four centra The base of the roof consists of an upper plywood ring it carries the conical roof sections which consist of marine ply attached to a framework. The roof contains a double shutter.

Saturn Launch Site

Few pictures reflect the state of American rocketry in 1950 so accurately as the first launch pad at Cape Canaveral. It was a 30-meter-wide layer of concrete, poured on top of sandy soil a little more than a kilometer north of the lighthouse. When a dozen jeeps and delivery trucks sank to their axles on the sandy paths that passed for roads, a layer of gravel was laid over the sand. Steel scaffolding, purchased from painters, surrounded the missile to form the first gantry, or service support tower. Plywood platforms stood at various levels of the scaffolding. If more than ten workers climbed the piping at the same time, the whole rickety framework seemed ready to fall down. The crew stacked sandbags around an old shack, a onetime dressing room for swimmers, and turned it into a launch control block house. It stood a scant 91 meters from the pad. A row of trailers contained additional facilities to coordinate countdown, information, and reports from tracking sites. Heat and humidity...

Tripods and Mounts

My friend Pat Rochford, was in this position some years ago as he embarked upon CCDing with his new 8-inch LX200. Like me, Pat is loath to buy anything when it can be made or modified. What he came up with was a wedge of (ply)wood. We originally looked on this concoction as a temporary fix, something to be used until a better one could be purchased. The wedge of wood worked so well, however, that Pat never had reason to buy another for his Meade SCT. Since the scope was to be placed in a permanent observatory, he also designed and constructed a wooden pier to go with the wedge. The pier is made from 1 2-inch plywood (3 4-inch might be even better), with all pieces being glued and screwed together. Double-thicknesses of -inch were used in places where it was thought necessary the base plate at the bottom of the pier and the upper plate on which the wedge rests. The dimensions for Pat's pier were 20-inches x 20-inches for the base, a height of 40-inches, and pier body 9-inches square,...

Domed Observatories

Many ingenious methods of fabricating domes, or approximately dome-shaped structures, from wood and metal and fibreglass, have been devised by amateurs and published in the previous reference and on the internet (see Appendix 2). There is no point reproducing this material here, as it is so easily available. It needs to be said that flat sheet materials cannot really be made into true dome sections, as that would involve bending them in two planes at once. One class of solution to this problem involves cutting gores - narrow, triangular-shaped sections of plywood or metal, that can be bent to be fitted over a wooden or steel frame, their points meeting at the top. Another class of solution involves simulating a dome-shape using flat sheets of board or metal on a frame. A fibre-glass dome is normally cast in sections, which, again, are commonly attached to a frame. This type of dome can be truly spherical, if the moulds for the fibre-glass sections can be given the right curves....

NASA Lifting Bodies

The first lifting body, designated the M2-F1, was a lightweight unpowered glider nicknamed the flying bathtub. It was built at the Dryden Flight Research Center out of tubular steel and plywood, and completed in 1963. Using a fast Pontiac convertible, it was towed across the lakebed more than 400 times at speeds as high as 120 mph. These test-tows provided the confidence for the next step. A NASA Gooney Bird (Navy R4D, the same as the Air Force C-47 or civilian DC-3) towed the flying bathtub up to 12,000 ft and released it to glide back and land. There were 77 such aerial tow-flights. The M2-F1 proved, for very little cost, that the concept of the lifting body worked, and the green light was given to continue the research.

Step By Step Guide

We chose 12mm plywood for the main body as it is easy to work with hand tools, and strong enough when cul to intricate shapes. Once it was accurately marked out, we used a coping saw for most of the cutting. An electric jigsaw Is an effective alternative, but holding the small parts while cutting requires care. When we drilled the holes in the two sides, we taped them together and drilled through both. This means that should you make a small error, it is repeated on both parts so the focus shafLs will still be parallel. The paint finish is optional, but does stop the plywood getting grubby. You may prefer a stain or varnish finish to suiL your telescope. Paint it before you assemble it, though, or the shafts will get stuck.

The Domes

A 3.6 m (12 ft) square wooden building with a run-off roof (see Figure 10.3). This was based on 150 mm (6 in) posts and beams and 12 mm (5 in) exterior grade plywood. The roof weighed some 250kg (0.25 tons), A problem with all three has been that the shutters were just sheets of plywood running in narrow slots. These either jammed or came out of the slots in use. The one dome of this type that is still used has there- Figure 10.4 Design for the replacement doors for the original shutters in a plywood dome. The upper door is operated by a gas spring, which pushes it up and is then pulled down again by a rope. Figure 10.4 Design for the replacement doors for the original shutters in a plywood dome. The upper door is operated by a gas spring, which pushes it up and is then pulled down again by a rope. 50 mm (6 in x 2 in) uprights, surrounded by 12 mm (2 in) exterior-grade plywood and then corrugated aluminium sheeting (see Figure 10.1). They have a rigid steel jacket at the top which...

The Complete Guide To Wood Finishing

The Complete Guide To Wood Finishing

Wood finishing can be tricky and after spending hours on building your project you want to be sure that you get the best outcome possible. In The Complete Guide To Wood Finishing you will learn how to get beautiful, professional results no matter what your project is, even if you have never tried your hand at wood finishing before. You will learn about every step in the wood finishing process from a professional wood finisher with years of experience.

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