what is type of hacksaw blade
Answers
Hand-held hacksaws consist of a metal frame with a handle, and pins for attaching a narrow disposable blade. A screw or other mechanism is used to put the thin blade under tension. A power hacksaw (or electric hacksaw) is a type of hacksaw that is powered by electric. motor.
Hardened Blades
Hardened hacksaw blades are made of tempered high-grade tool steel. The steel is hardened throughout the entire blade, including the teeth and the backing. Sometimes referred to as all-hard blades, these blades maintain their sharpness and their teeth, but they can be brittle and more prone to breaking.
Flexible Blades
Flexible blades only contain hardened steel on the teeth of the blade. The backing of the blade is a flexible metal sheet. These blades are sometimes called bimetal blades. They are less brittle than all-hard blades and therefore less prone to snapping.
Diameter Sizes
Cast iron pipe is usually installed in 4-inch diameter 8-foot sections, where ABS sewer pipe comes in a diameter range of 1 1/2 to 4 inches (depending on the water fixture it connects to), and also in 8-foot lengths. Gas pipe, however, has smaller diameters of usually 1/2 or 3/4 inch and is available in many different lengths.
Installation Processes
The connecting process of each type of pipe is quite different. Where cast iron sections were once sealed together with oakum and melted lead, today a rubber gasket and stainless steel band are used. Gas pipes connect with female threaded steel couplings and threading compound, and ABS pipes fit together with ABS couplings and ABS cement.
Fixing/Removing Broken Pipe Sections
Though cast iron is very tough, it is also brittle and will crack/break if it receives a heavy direct knock. As cast iron cracks tend to increase in size over time, the cracked section must be cut out and replaced with either a new length of cast iron pipe or PVC pipe (where code permits). ABS pipe is also durable but will also crack/break if heavily knocked. Smaller cracks can be fixed with epoxy putty, but larger cracked sections must be replaced with new ABS pipe. If a gas pipe length is broken, it must always be replaced with a new section, to make sure there is no fear of leaks.
Other General Differences
ABS sewer pipe is cheaper and easier to install than cast iron, and as ABS is a lot lighter than cast iron, there is less danger of bodily injury during the installation process. However, cast iron pipe's thick walls act as an insulator against the noise of water/waste traveling along the pipeline. Cast iron pipe is cut with a device called a snap cutter, which generally has to be rented from DIY rental houses, where ABS is simply cut with a handsaw, circular saw or miter saw. Gas pipes are different from both cast iron and ABS pipes in that their ends are threaded to fit into the coupling. Consequently, if a gas pipe is cut through (using a tubing cutter or hacksaw), each side of the pipe cut must be threaded with a threading die before it is fitted back together.