What is Magnalium and how to machine it?

Magnalium is a general name for a group of aluminum alloys containing Magnesium as the main alloying element.
The Magnesium content can vary widely, from 5% to 50%, which influences the properties of the alloy.
The machinability of Magnalium lies between that of Aluminum and Magnesium, depending on their respective percentages in a specific alloy grade.
The addition of Magnesium increases the strength of the alloy but affects machinability.
It is important to note that Magnesium chips are flammable. Therefore, when machining Magnalium with higher Magnesium content, fire precautions such as cooling, chip disposal, and chip handling should be prioritized.

What is "Damascus steel" and which steel grade is equivalent to it?

"Damascus steel" is a general term for crucible steel that was used for making sword blades in the medieval Orient, featuring a patterned ("damask") surface.
The typical hardness of Damascus steel is more than HRC 55. The distinct process of producing Damascus steel was lost in history, and several theories exist about how the steel was made.
Various modern reproductions of this steel, particularly for producing knives, sometimes use the original name.
From a machinability point of view, high carbon steels such as DIN/EN 75Ni8 (W.-Nr. 1.5634) or AISI/SAE 1075 and 1095 can be appropriate references.

Bevel angle

sometimes, this term is used interchangeably with "cutting edge angle"

Crown drill

a drill equipped with a replaceable cutting head, often referred to as the "crown".

White-noise milling cutter

typically refers to a milling cutter designed to reduce vibrations and noise during cutting.
This is achieved through various design solutions, such as unequal angular pitch of teeth or variable helix angles.