Factory work seems so dangerous and grueling.
Absolutely. Factories typically have lots of buildings and complex machines that do constant work. All the people and machine residue can make quite a mess.
yea its very heavy duty and monotonous work
Speaking of, factories actually came about during the Industrial Revolution. An exciting time, but also a very dirty and unsanitary one as well as space requirements were a constant struggle
Yea and not only was it hard and dangerous but they had kids working them as well
Glorified sweatshops, yes. Modern factories have large warehouses and assembly lines, but back then it was all labo intensive 
Yea some of them required much more attention to detail.
workshops".
Most modern factories have large warehouses or warehouse-like facilities that contain heavy equipment used for assembly line production. Large factories tend to be located with access to multiple modes of transportation, with some having rail, highway and water loading and unloading facilities. 
Factories may either make discrete products or some type of material continuously produced such as chemicals, pulp and paper, or refined oil products. Factories manufacturing chemicals are often called "plants" and may have most of their equipment – tanks, pressure vessels
Machine factory
A machine factory is a company, that produces machines. These companies traditionally belong to the heavy industry sector in comparison to a more consumer oriented and less capital intensive light industry. Today many companies make more sophisticated smaller machines, and they belong to the light industry. The economic sector of machine factories is called the machine industry.
History.
The machinery factories came into existence in the course of the Industrial Revolution. Late 18th century most production machines, were still made of wood and manufactured in local