Processing basic knowledge of CNC precision hardware parts processing

In the mass production of CNC precision hardware parts processing, because the workpiece requires high precision and short delivery time, the work efficiency of the equipment is the top priority of production and processing. Being able to grasp the simple basic knowledge can not only improve the production efficiency of hardware accessories processing, but also reduce the failure rate of the equipment during use.

CNC precision metal processing

Next, the engineers of Tongyang CNC Technology will tell you some basic knowledge of CNC precision hardware accessories processing and share with all netizens:

  1. Chip control

Chips wrap around a tool or workpiece in a long continuous cut. Usually caused by low feed, low and/or shallow depth of cut for the geometry.


  1. The feed for the selected geometry is too low.

Solution: Progressive Feed.

  1. The depth of cut for the selected geometry is too shallow.

Solution: Choose insert geometries with stronger chip breaking. Increase coolant flow.

  1. The tool nose radius is too large.

Solution: Increase the depth of cut or select a geometry for stronger chip breaking.

  1. Inappropriate main declination angle.

Solution: Pick a smaller nose radius.

  1. Appearance quality

It looks and feels “hairy” and does not meet the requirements of public service.


  1. The chip breaker hits the parts and leaves marks on the machined surface.

Solution: Pick a flute that guides the chip evacuation. Change the entering angle, reduce the depth of cut, and select a positive tool system with a mid-cut angle.

  1. The reason for the hairy appearance is that the grooves on the cutting edge are worn too severely.

Solution: Choose a brand with better oxidation wear resistance, such as a cermet brand, and adjust the cutting speed.

  1. The combination of too high feed and too small corner fillet will cause rough surface.

Solution: Choose a larger tool nose radius and drop feed.

  1. Burr composition

When the cutting is separated from the workpiece, a burr is formed at the end of the cutting.


  1. The cutting edge should not be sharp.

Solution: Use inserts with sharp cutting edges: – Finely ground inserts with small feed rates (<0.1mm/r).

  1. The feed is too low for the roundness of the cutting edge.

Solution: Use a shank with a small entering angle.

  1. The groove at the cutting depth of CNC precision metal processing is worn, or chipped.

Solution: Complete the cut with a chamfer or radius when off the workpiece.

  1. Oscillation

High radial cutting forces, cause: Oscillating or chattering scratches from the tool or tool set. It usually occurs when using boring bars for internal machining.


  1. Inappropriate main declination angle.

Solution: Pick a larger entering angle (kr=90°).

  1. The tool nose radius is too large.

Solution: Pick a small nose radius.

  1. Inappropriate cutting edge roundness, or negative chamfer.

Solution: Pick a label with a thin coating, or an uncoated label.

  1. Excessive flank wear on the cutting edge.

Solution: Pick a more wear-resistant brand or adjust to reduce the cutting speed.