We generally do CNC, no matter which programming software you use, no matter which version you use, in the final analysis, are setting the following parameters

### 1: Cutting depth, that is, the depth of cut of each layer;

It’s like you cut a radish with a knife, how thick each piece of radish is!

This is easier to understand. Someone is very urgent to ask the teacher, how much should I process each layer?

This is to ask yourself. Because the tool diameter is only known to you. Is your tool 80mm, 30mm, 1mm, or even 0.3mm?

What is the concept of 0.3mm, that is, three sheets of paper are stacked together, which is the thickness of a business card. I used to grind a lot of 0.3 knives on a knife grinder.

And what kind of material are you going to process. Do you process cake or wood, or machining aluminum or copper?

You cut the cake, the plastic cutter will do!

It’s like you are chopping wood with an axe. You go down 1cm with an axe. That is 10mm

Why don’t you use an axe to cut iron, because if you go down with an axe, your knife will collapse!

If you change a suitable axe, you can also use the axe to cut iron.

### 2: Spindle speed, which is the speed of the motor (also called motor) in the machine tool, that is, the speed of the tool n.

Because this is a bit difficult to understand, I will help you understand.

The speed of the tool can be converted into a linear speed, because the tool is mounted on the chuck and rotates continuously, it is difficult to understand how fast he is. If it is a car and a bicycle, as well as a motorcycle, then it’s easy to understand. Because you have a better visual experience, you can even convert it into kilometers per hour, kilometers per minute, meters per second.

The formula for calculating linear velocity: We generally see this in books.

But the writing is generally like this.

v=π*D*n/360

Explain: v: is the speed, in fact called linear speed. It can be understood as linear velocity.

π: It is the pi. Generally, it is better to take 3.14.

D: It is the diameter of the tool. In fact, the speed we calculated in this way is the speed on the edge of the maximum diameter of the tool.

n: It is the speed of the motor.

Inside, many people have a misunderstanding, including experts!

We introduce the above schematic diagram in detail.

First of all, the formula, you die hard and memorize it. I did the same thing when I was studying mechanics!

Then the cutter is the bottom view of the cutter, that is, you hold the cutter in your hand, and then look down the handle, it is a circle.

Then the speed chart, it is estimated that many people have not seen it.

For this speed graph, I drew it together with the cutter, and then I drew three speeds on it.

In order to facilitate the calculation, we assume several parameters, one is the tool diameter is 10 mm, the spindle speed is 3,000 rpm.

The first v1 is the speed of the tool center. According to the formula, this speed is 0!

v2 is where the tool is roughly 1/2 of the tool radius, we know it after conversion, and it is calculated to be 130mm/s

v3 is the edge speed of the tool, we know it after conversion, the calculation is 261mm/s

So, this speed is a variable value, and then each tool supplier will give us a reference value. We can refer to it!

Finally, I recommend you a cnc machining parameter:

For processing 45 steel, use a knife with a diameter of 50R5 to roughen, step distance 70%, depth of cut 0.5 per layer, speed S700, feed F2400, machine tool is 850 domestic linear rail machining center, according to the conversion formula F (formula) = F (single Blade feed) × Z (number of blades) × speed S, the calculated feed per blade reaches 0.86mm/r, and the maximum single-blade feed given by the brick house is 0.3mm/r

The 50R5 knife has a minimum diameter of 40mm and a maximum diameter of 50mm

The middle 0-40 mm has no speed.