CNC Control Computer

CNC Control Computer

The Control Computer generally resides in the shop somewhere near the CNC machine it is controlling. Control Computers don't have to be the top of the line, every bell and whistle type of computer. These are the workhorses. Save your money for a good design computer. You will save much more time having a fast computer for your designing.

A control computer doesn't have to be that powerful for a few good reasons. It doesn't have the workload. It takes G-Code and turns it into signals that it transmits to the Machine Controller. Turning G-Code into signals is not that labor intensive for a computer.

I have used multiple types of control computers. Everything from a 486 DOS running "$30 special" to a modern Dell with Windows XP. I have yet to try one with Vista. I will keep you posted. Generally I like to find a good used computer for a couple hundred bucks, wipe the hard drive and only load the control software onto the machine. That way you know what you have.

There is another good reason you don't want to spend a lot of money here. This computer will usually be located in the shop. Dirt will be located in your shop. Using logic here, dirt will be located in your computer. If the computer does go belly up, you aren't out your children's college tuition.

Here is my strategy in a nutshell for Control Computers. The dirtier the job, the less money I spend on the computer. My plasma cutting computers are bought in the $40 range. They eat a lot of dust and dirt. I blow them out frequently. My wood routing computers are in the $100 dollar range. My milling machine computers usually are in the $200 range. Truth be told, they all last a very long time if you keep dirt, dust and plasma smoke out of them.

How is the CNC Control Computer used?

The control computer has the control software loaded on it. You start up the control software then load up the CNC Program you created. When you do this, the G-Code will be visible and ready to go. Once you prep your CNC Machine and zero it out, you can begin your "cycle." A cycle is usually completing one CNC Program, which is a machining sequence. You will also hear the term "Cycle Time" on the professional side of CNC a lot more. The quicker you can get the cycle time, the more parts you can make. And yes, that translates to more money.

Back in the good old days of Home CNC, everything was transferred on a disk. Now I have seen people include their Control Computers on their home computer network and transfer the files needed wirelessly. At a very minimum, get a good jump drive and transfer things back and forth that way.

CNC has become a very popular hobby and more and more people are starting to hop on the band wagon of CNC. Its a fun hobby and easy to do from your very own home with just a little elbow grease and creative mind.

by Ivan Irons
keyword : CNC Control Computer

CNC Process Overview

CNC Process Overview

Quick Explanation of the Process

This is how I view CNC. I break it down into simple steps that I can remember. Now, they all interact, but it is good to keep them in boxes for simplicity sake. I also like to keep them in a logical, progression type order. Here they are: Design, CAD, CAM, Control and Machine.

Today you are going on a journey. You are going to learn about the basics of CNC. I hope you are as excited as I am about this topic.

I have been using CNC equipment in my home shop for six years now. The technology gets better and better every year.

The software gets better every year. At one time large companies could only afford this technology. Now there are hundreds of thousands of these machines working in garages like yours and mine.

There are basically five elements to a CNC Project that you need to know:

Design - thinking and planning what you want to build CAD - translating it into the computer CAM - converting it into machine language Controlling - directing your machine's motion Machining - building the part to specifications

These five elements are really the building blocks to a CNC project. As you see them above, that is generally the order people associate them in. For example, you can't control until you have a design. You can't use your CAM software before your CAD software. One of the main things you need to address is how these elements interact with each other.

Right now this may seem confusing. Over time, it will seem very basic. The more you use these elements with one another, the more their order will become second nature.

Note: The A-axis is the rotational axis. Why is it called that? I don't know. It is also sometimes called the B-axis. I have even heard it called the W-axis. A-axis is the rotational axis around the X-axis. B-axis is the rotational axis around the Y-axis.

Buying a completed CNC Machine

If you purchase a CNC machine outright, it will have a machine controller as part of the package. Everyone does it a bit different though. Some try to make it a black box that only they can fix. Other use commonly used components so you could repair it if need be. You will just have to ask the manufacturer and see what they say. My experience says they usually tell you that it uses common components that you can get anywhere if needed. If something goes wrong, it seems you can only get the part from them. You will have to decide.

Internal Machine Controller Parts

There are many different electrical components that go into a machine controller. I won't pretend that I am an expert on this. Actually, this is one of the components I buy pre-made so I don't have to do it. If you are an electronics junkie you could build your own. I know where my skills are at and it isn't in assembling and understanding electronics.

by Ivan Irons
keyword : CNC Process Overview