①It Should Be Able To Ensure The Accuracy And Accuracy Of The Workpiece Being Processed.

①It should be able to ensure the accuracy and accuracy of the workpiece being processed.

The G code looks like a string of garbled codes. CNC milling programming G code detailed explanation CNC milling programming G code detailed explanation CNC milling programming G code detailed explanation ① It should be able to ensure the accuracy and precision of the workpiece being processed, but if you really understand it, CNC milling programming is no longer a black box.

What exactly is G code?

G code is actually an instruction set, which is specially written for CNC machine tools. Its core task is to tell the tool how to move in the three coordinate directions of X, Y, and Z, and how fast to move.

One of the more common codes here is G00, which is used to achieve rapid positioning. Another common code is called G01, which is used to represent linear interpolation operations. In addition, the two codes G02 and G03 are used to control clockwise arc tool movement and counterclockwise arc tool movement respectively.

In addition to the tool path, the G code also governs the control of the spindle speed, the operation of tool change and the opening of the coolant switch. Specifically, the spindle is started with the M03 command, the tool change operation corresponds to the M06 command, and the coolant is opened with the M08 command. Whether a CNC milling machine can do the job well depends to a large extent on whether these commands are reasonable in the pairing and whether there are errors in the execution sequence.

How to go from drawings to procedures

The actual work process is to first read the drawings to determine dimensions and tolerances, then select tools and cutting parameters, then use software such as Mastercam and FANUC NC editor to generate G code, and finally import it into the machine tool for simulation verification. In 2026, mainstream CAM software will be very popular in workshops.

The two figures of feed speed and spindle speed cannot be filled in casually. It needs to be calculated based on the specific material conditions. These materials include aluminum alloy, 45 steel and mold steel. Of course, parameters also need to be calculated based on the diameter of the tool.

If the parameters are set incorrectly, the surface roughness may exceed the standard. Or the tool may be broken directly. Just one scrap can cost enough to purchase several new knives.

CNC turning and CNC milling have different divisions of labor

CNC lathes mainly deal with parts with symmetrical structures, such as shafts, sleeves, and flanges. They allow the tool to rotate around the workpiece for cutting. CNC machine tool milling machines can perform multi-face milling and can also perform work such as cavities and threads. They are specialized in solving the problems of parts with very complex shapes.

Many workshops are equipped with both. A part is first processed by CNC turning to produce a rough blank, and then CNC milling is used to refine the profile. EDM wire cutting is responsible for cutting the high-hard alloy seams that the milling cutter cannot reach. Each of the three processes has a section.

Check the configuration at the workshop floor

Nowadays, most machine shops in the country already have the ability to perform CNC processing. If you buy a three-axis CNC milling machine, its retail price is usually in the range of 150,000 to 400,000.

Because of the different brands, for example, the price difference between different brands such as Haitian, Neway, and DMG is still quite large. However, no matter what, their core instruction systems are basically the same and there is not much difference.

A standard five-person team usually includes one programmer, one machinist, and one quality inspector each, plus a blanking station. If the equipment is operated in two shifts, the equipment utilization rate can be increased to more than 85%. This is a relatively common arrangement in the industry.

The most common knife for beginners

At present, the most common situation is to set the coordinate origin to be offset, thus causing a serious accident. If the original position of the workpiece is not adjusted accurately, and the tool falls directly and hits it, then the lightest result is just scrapping a cutting tool, and the worst case is that the work surface is scratched and damaged. The amount of money spent to repair the entire table is enough for the user to make a profit within half a month.

There is another big pitfall, which is not turning on the coolant when milling aluminum alloy parts at high speed. The temperature can soar to more than 200 degrees. Tool coatings wear and fail within a few hours. There will also be obvious traces of strain on the surface of the workpiece. Developing the habit of executing the M08 instruction at the beginning of the program can save a lot of money.

What to practice next

Before running the program on the computer, it is recommended that you perform an empty stroke in the hand mode first, and then switch to the automatic mode when the path is indeed error-free. For complex machining programs, simulation must be done first, because both the FANUC system and the Siemens system have built-in simulation functions, so don't be afraid of trouble and not do it.

You need to read through the G code manual more and memorize the high-frequency instructions from G00 to G03 and M03 to M08 to the point where it forms a conditioned reflex. This way, when you operate the computer, you will have confidence in your heart, your hands will not shake, and your mind will not panic.

When you used a CNC milling machine to program for the first time, did you stumble on which command was the most troublesome? You can talk about your own experience in the comment area. If you find this content useful, give it a like and forward it to your colleagues in the office.