Generally, a jade punching needle can punch 2 holes in one minute.
the small hole is drilled by needle, that is, a needle is used. Generally, the needle is pulled by hand to make the drill rotate and rotate on the jade, so as to drive the "jade-removing sand". First, a shallow pit is ground on the surface, and then a deep pit is ground until the jade material is worn through.
the principle of ultrasonic drilling machine is to use the high-frequency vibration generated by ultrasonic waves to make the small needle drill move up and down at high speed and drive the abrasive to drill holes. Because the small needle drill does not rotate, it just moves up and down in a high-frequency reciprocating manner. So the quality of punching is very high, and the holes are even up and down.
There are two kinds of jade: soft and hard. Usually, jade refers to nephrite, and jadeite has another popular name-jadeite. Nephrite is a hydrous calcium magnesium silicate with hardness generally below 6.5, excellent toughness, translucent to opaque, and fibrous crystal aggregate.
Jadeite is sodium aluminosilicate, with hardness of 6.5-7, translucent to opaque, granular to fibrous aggregate, and dense block. The two kinds of jade are similar in appearance, and the proportion of jadeite (3.25-3.4) is larger than nephrite (2.9-3.1).