Annealing.
Machined surface is more rough.
Rough turning is a machining process used to remove large amounts of material from a workpiece to achieve a basic shape and size. This process typically employs a lathe, where a cutting tool is applied to the rotating workpiece to create cylindrical or conical forms. The primary goal of rough turning is to prepare the material for subsequent finishing operations, ensuring that it meets tolerances for further machining. It is characterized by the use of higher feed rates and depths of cut, resulting in a rough surface finish.
Abrasive machining is when you use a machine to apply something rough, like sandpaper, a file, sand blasting, etc., to an item to shape it or smooth its surface.
These machines can rough machine both sides, at the same time, of a blank to "near finish" or "finish size" on the thickness of a blank. This cuts the time spent finish machining on a more expensive CNC machining center to perform the more complex machining characteristics of the part. Unfortunately, this increases handling time, setup time, and adds another move and probably another storage point to the process.
I would use a metalworking lathe with a four-jaw chuck mounted on the headstock. You can start with a hunk of metal or from a rough casting.
Rough cutting on a lathe is the initial phase of machining where the primary goal is to remove a significant amount of material quickly to achieve a basic shape and size of the workpiece. This process typically involves using larger cutting tools and higher feed rates, which results in a coarse surface finish. The rough cut sets the stage for subsequent finishing operations, which refine the dimensions and surface quality. Overall, rough cutting is essential for efficiently shaping the material before finer details are added.
The rough opening required for a 30-inch door is typically 32 inches in width and 82 inches in height.
Pistons are typically made from aluminum alloys due to their lightweight and strength properties. The manufacturing process begins with casting the aluminum into rough shapes, which are then machined to achieve precise dimensions and surface finishes. After machining, pistons undergo heat treatment to enhance durability, and final processes include adding coatings for improved performance and reducing friction. Quality control checks ensure that each piston meets the required specifications before being assembled into engines.
The standard rough opening size required for a 30-inch door is 32 inches in width and 82 inches in height.
The standard rough opening size required for installing a bathtub is typically around 60 inches in length and 30 inches in width.
The standard rough opening size required for a 24-inch door is 26 inches in width and 82 inches in height.
The standard rough opening size required for installing double doors is typically 60 inches in width and 80 inches in height.