The very first bulldozer was adopted from the farm tractor that was utilized to p lough the fields. The versatility of this equipment in the squashy ground for road building and logging had led this tractor to become an armored tank during the First World War.

James Cumming and J. Earl McLeod complete the first design for bulldozer in 1923, and the imitation is present at Morrowville, Kansas City Park from where the two constructed the very first bulldozer.

Blade – bulldozer blade is made by the heavy metals placed on the tractor front with the purpose of pushing the objects, shoving soils, sand and debris. For military utilization, dozer blade was rigid on the combat engineering vehicle that can also be fitted to other vehicles like artillery tractors.

Dozer blades could also be accumulated to the main battle tank which was utilized for clearing antitank obstacles and digging improvised shelters. The combat functions of dozer blades incorporate the clearing of the battlefield obstacle and the preparation for the fire positions.

Ripper -is a device at the rear of bulldozer which is elongated and claw-like in appearance. Rippers can be single shank or they can also be in a cluster of multi shank rippers. Single shank was commonly chosen in doing heavy ripping. Tungsten steel alloy tip which is replaceable is used in fitting the ripper shank.

A good example of the attachments that can be applied to this kind of construction equipment is the ripper. It is commonly found on very large bulldozers that you will see on quarrying and mining sites. From the name itself, it is used to rip and break down the surface of the rock formation into pieces so that it will be easier to handle. Once they are broken into pieces, it can already be available for use as raw materials needed by the industry.

One safety feature of the bulldozer is its canopy. It is part of the machine that is attached and located at the upper portion of the construction equipment. It serves as the roof of the machine that will prevent any damage to the machine and most especially injury to the operator. Since its job is to push through any obstacles like for instance breaking down of rocks, there can be some debris that will fall to the machine. Without the canopy, the function of the machine can be affected and the life of the operator can be in grave danger.

Rocks that were ripped allow ground surface rocks to be broken to tiny rubble which are easy to hold and transport and can be detached so that grading will take place. The agricultural ripping allows very firm rocks like podzol hard-pan be wrecked so that lands that can not be ploughed may be farmed. Hard soil may be broken and ripped in order to permit planting to orchards wherein trees could not grow.

Some of the common wood working machinery is table saw, planer, drilling machine and spindle molder. There is a lot of variety available for the size and capacity of these machines. They can be selected according to the job for which we want to use them.

The table saws can be called as the most useful of the wood working machinery. There are two types of wood saws available. They are the ones with a fixed base and the second ones are those with a moving base. The ones, which are mounted on the table, have a fine grove to on one side of the blade. It is from here that, the crosscut angle will move. In addition, a fence, which guides the wood for cutting, is attached to the same side. This machine is useful for giving cuts in parallel to the sides of the wooden piece.

On the other hand, the sliding table saw slides over the table on which it is mounted. Therefore, we can cut a wooden piece placed it. It is very popularly used for cutting flat panels of wood.