What are the specifications of the countersink
There are six types of taper angles for cone countersinks: 60°, 82°, 90°, 100°, 110° and 120°. Types of countersinks Countersinks are divided into cylindrical countersinks, conical countersinks, and end countersinks. 1. Cylindrical countersinks are used for countersink cylindrical countersunk holes. The main cutting function of the cylindrical countersink is the end blade, and the bevel angle of the spiral groove is its rake angle. There is a guide post at the front end of the countersink, and the diameter of the guide post is closely matched with the existing hole of the workpiece to ensure good centering and guidance. The guide post is detachable, and the guide post and the countersink can also be integrated. (Generally it is a countersunk head knife, stepping on a cylinder countersunk head). 2. Taper countersinks are used for countersinking. The taper angle of the tapered countersink drill is different according to the requirements of the workpiece countersunk head hole, which are 60°, 75°, 82°, 90°, 100°, 120°, etc. Among them, 90° is the most used. 3. The end face countersink is specially used to counterface the end face of the flat hole. End face countersinking can ensure the perpendicularity of the end face of the hole and the center line of the hole. When the processed hole diameter is small, in order to maintain a certain strength of the cutter bar, a section of the diameter of the head of the cutter bar can be matched with the processed hole as a gap to ensure a good guiding effect. The countersink is a standard tool, produced by a professional factory. It can be selected according to the type of countersink, or it can be converted into a countersink with a twist drill. The role of countersink The countersink is to process the end face of the hole on the plane, cylinder, cone and other profiles. When machining cylindrical countersunk holes, tapered countersunk holes and end bosses on the machined holes, countersinks are used. Flat-bottom countersink (English name Counterbore), which has 3 to 4 cutter teeth on the circumference and the end surface, inserts the guide post into the processed hole, its role is to control the coaxiality error of the countersink and the original hole . The guide post is generally made detachable to facilitate the manufacture of the face teeth of the countersink and the sharpening of the countersink.