Babul specie of Indian timber tree. It is whitish red in colour, it is strong, hard and tough. It has a natural polish and is used for the wheels and bodies of bullock carts and other agriculture tools.
Here are the most important things to make sure you get right:
#1 Make sure your wheels are on straight. Some people claim that putting your wheels slanted will make it faster by reducing friction, but I don't agree. Straight wheels mean your car will go straight and won't rub the guide rail.
#2 Make your car body light, then add weight to the back end. Try to get your car's center of gravity (balance point) as far back as possible without making it pop a wheelie. This is simple physics - The back end of your car will be at the top of the track at the starting line. The farther back your weight is, the more potential energy your car will have. Get your weight as close as possible to the maximum weight allowed (usually 5 ounces). We weigh cars at check in on an accurate digital scale, and my cars are always 5.000 ounces.
#3 Polish your axles and use graphite powder. I polish my axles with a series of sandpapers, from coarse to ultra fine, then finish off with some chrome polish. After your wheels are mounted, apply some graphite and then spin each wheel by flicking it with your finger A LOT to "work in" the graphite. Then leave it alone. Don't apply more graphite on race day.
Other general tips:
- Aerodynamics are really not that much of a factor on cars this small. Thin wedge-shaped cars tend to be faster because their weight is to the back, not because they have less drag.
- DON'T get any glue or paint on your wheels & axles! Put the wheels on after everything else is done and dry.
- Make sure no part of your car drags on the track or rubs against your wheels.
Well, what I did to win the derby back in '82 was to cut most of the back half off, and glue it on top of the front half, leaving enough of a flat bed in the back for the rear axle (it comes out looking like a big-rig, without the trailer). So then slap some blue and red paint on it so it looks like Optimus Prime, and let her rip.
The fun little surprise is when the cars are sitting on top of the track, all 4 wheels are touching. But once released, the front-heavy truck actually races with only its front wheels touching the track. Without the back end touching, the resistance is lessened, and the beast hauls. This was a total surprise to me, as at 8 years old, I was just trying to make it look cool. But it was a total blow-out. Won every race by a mile.
The next year, I wanted to make a sleek little Delorean looking thing, which I did. It probably would have done so-so as it was, but it was way under the max allowable weight. So then my mom stepped in with the idea of hollowing out the center of the car from the underside, and gluing in enough quarters to bring the weight up to max. The low, central center of gravity got me a repeat of the previous year, only this time, all wheels touched.
The following year was going to be something sick, as I had planned to remake the truck only this time deliberately balanced with quarters. Unfortunately, I wasn't in the scouts after that. So, unless they have changed the rules in the last 20 years, this'll probably blow them all away.
The shape is one of the least important aspects of a fast PWD car. I'm the PWD coordinator for our Pack and the father of 2 Scouts who make very fast cars. The car design did not play as much a role as weight, friction and alignment. Weight needs to be in the back - just think about a marble on a track - will it go faster on the incline or the flat part of the track - the incline so move the weight to the back so it is accelerating for the max time. Mount the weight across the car (not front to back) to reduce rotational force required as the car moves down the curve of the track. Do not have a pointy nose to the car or they may run it down the track backwards.
The theoretical maximum speed of a PWD car is governed by friction and gravity. The track starts 1.2192 meters (4 feet) up and is 12.8016 meters (42 feet) long. Gravitational acceleration is 9.8 meters/sec^2 (32 ft/sec^2). A perfectly frictionless car would be going 4.89 meters/sec after falling 1.2 meters (4 feet). Going at that speed, it would take 2.62 seconds to go the length of the course. That is a car and track with no friction - not going to happen in real life. My son's car had a best time of 4 runs of 3.5004 seconds, which is 74 percent of the theoretical best speed. He beat 30 cars at the Pack and 160 cars at Districts. His car was a modified wedge - the Ground Effects Machine on this site.
His car has an extended wheelbase with titanium weights in the back - high density, non-toxic. Three wheels were on the track and the axles were deburred, straightened and polished with 1500 grit emery paper and 1 mil polishing compound. Silver polish would probably do a good job for final polishing. He took the mold marks off the surface of the wheels. The only lubricant was powdered graphic. No nickel plated precision milled axles, no milled Teflon covered wheels with coned hubs. Aside from the paint and the weight, everything came out of the box. Aside from the bandsaw, my son used all the tools and did all the work.
It is all a "by chance" last year my son did not do well, he shed tears. We talked about winning/losing and how to improve. I looked up some tips and tricks, this year he placed 2nd for Den 3rd in pack. (and I am sure they played VERY little in his chance to win, but it made my son feel better knowing we tried our best to build a winning car even if it did not do well)
I hardly ever use a sharpener to sharpen pencils, actually, because it's hard to get a good point. Get an Exacto knife (I think that's how you spell it), and scrape off the top of the pencil equally, going all around the pencil. If you've done that, but the tip still isn't sharp enough, just scrape off the lead, not the wood underneath it. Here are some more in depth/other methods:
Sharpening with a knife
A knife is the most versatile method of sharpening a pencil. It can take a little practice but it's a very useful skill to master. Make sure you cut away from yourself and preferably over a bin. With softer leads try cutting smaller bits at a time to prevent breaking.
Using sand paper
This is a neat little trick that I use regularly. Try clipping a little piece of sandpaper to your drawing board and if your pencil starts getting a little blunt just run it over the paper a few times to bring the point back. This is especially useful during quick figure drawings when there is no time to get out your sharpener.
Paper wrapped charcoal
This is a very neat way to sharpen charcoal pencils. Simply pull back the string a little then peel off a roll of paper. The best thing about this method is you are left with the 'bullet point' style of sharpened pencil, very nice!
You could also use scissors. Just simply grab any scissors (any kind) then just cut until it's sharp. I have tried this myself and it can get very sharp
You can use a knife but a sharpener is best
You can use a pocket knife (or any sharp carving knife, for that matter) to define the point of a pencil. Although, achieving a good point is difficult, so a sharpener is preferred.
Use a knife. It works.
sculptor and what he/she makes is called a sculpture
ANS 2 -Factories use a variety of saws to cut wood. Depending on the use and type of wood, they may use a large bandsaw, an industrial tablesaw with 12" blade or an industrial 'sliding table' saw which has a 5" pre-cutting blade and a 16" main blade.
have a;ll the kids chip in
Sculptor better answer - a Mason who specialises in stone .
Eggshell carving nowadays is primarily used by ultilizing a high-speed rotating tool that spins as high as 400,000rpms. Lasers being used to carve on eggshells is a myth.
Carving is simply changing the shape of a material usually using tools.
Wood and stone are the most popular materials used but anything solid can be carved. tools can range from basic knives and chisels to diamond tipped power cutters and chainsaws. Carving can be done in relief i.e. forms are carved into the surface of a material, or sculpted in the round.
Carving differs from other forms of sculpture in that it is subtractive; shapes and patterns are created by removing pieces of the material you are working with. Carvings can range from the tiny and intricate such as Japanese netsuke, to the enormous such as Mt Rushmore. Carving is a very ancient art form and many cultures have very old carving traditions.
President Jefferson Davis and Generals Robert E. Lee and Thomas J. "Stonewall" Jackson
You take a piece of wood and cut away the parts that don't look like an eagle.
Each man carved had done something for the country. Washington was the first President, Jefferson wrote the Declaration of Independence, Lincoln freed the slaves, Teddy Roosevelt started the national park system.
It is believed that Khafre's workers shaped, by carving, the stone into the lion and gave it their king's face over 4,500 years ago. See the link below.
240 feet long, 66 feet tall, and 20 feet wide
The Best possible wood for carving is Evergreen.
Many woodcarvers as do I use BASSWOOD, Its a soft tight grained wood which makes for its popularity. Its very easy to carve, Its true you can use most any wood. NOTE: (the harder the wood the harder to carve) And in some cases (With a knife almost impossible) With the onset of power tools such as grinders, diamond , cutz-all , and carbide bits the harder woods are used more. Good-Luck
First, you try to find out what type of metal it was made of. That way, you will know what area, time period, and if it was owned by a wealthy man or not. Then, see if it has a brand name on it. That way, you will know if it was made by a blacksmith, or sold by a company. finally, check out what condition it is in. This way, you will find clues to when it was made, and possibly who it wielded by.
According to my research and personal experience, both alder and agathis are considered soft woods, but I believe alder is the harder of the two. But wood densities can vary greatly. Agathis is in the pine family, so it would stand to reason that it's soft. The alder wood guitar bodies that I own don't seem that soft to me! Hope that helps.
Viking carvings are carvings made, often in stone, by Vikings.
They wrote messages on the stones with their alphabet called the runes.
They also carved drawings of their gods, everyday life, special events or a memorial.
A person who carves is called asculptor, a sculptress, a carver, or a sculpturer.
A sculptor is a person who shapes, molds or fashions wooden objects, stone or metal or any other material, like clay, to produce works of art or models.
A sculptor is also a constellation (or a system of stars) in the Southern Hemisphere near Cetus and Phoenix.
A sculpture is the actual work produced by the sculptor.
Marble is relatively soft (calcite, the predominate mineral in marble is a 3 on the Mohs hardness scale) making it easy to work with, and the intertwined mineral crystalline structure from its recrystallization from limestone or dolomite also makes it less likely to fracture when struck with a tool. Marble will also take a polish, and has a translucency that gives it a pleasing appearance.
real jade changes from alighter green to darker. If you look hard you will see a swirl patter, this typically indicates jade.
If we assume that you are using a 120V electric pencil sharpener, then it uses approximately 100 Watts.
Over a ten hour period of constant use, that would add up to 1 kWh.
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