The ‘Nominal’ column shows the nominal value of the gap that we will have between the blocks and the pocket. Max and Min Condition show the extreme cases for each analysis type.

A CNC fixture is a work-holding device with wide use centers on securing, supporting, or mounting a workpiece correctly on the CNC machine. It is an important tool because it makes sure you have conformity and interchangeability during the manufacturing process.

This article will demystify CNC work holding fixtures in three steps. It will show their functions and applications. It will give solid information on the types of CNC work holding fixtures. Finally, it will give you premium information on what to do to get the best CNC fixture design or use a custom CNC fixture.

Make sure to use the converted bilateral tolerance, and make sure to use the correct signs per the loop diagram. Columns in blue will be automatically calculated.

Universal CNC fixtures are usable on any workpiece with ease in adjusting them. Each part of the fixture is adjustable and replaceable to suit any workpiece. Like its name, universal fixtures have a very wide scope and applications.

CNC fixture has wide applications in the manufacturing industry wherever CNC machining is employed. Its functions are integrated with the types of CNC operations used in the manufacturing process.

CNC Grinding involves removing a  part of a workpiece with the aid of a Grinder. It is another popular CNC machining process used in cutting aside CNC milling. Grinding fixtures are fixtures applicable in CNC grinding processes.

Millingfixtures

Another important thing to note while designing a custom CNC fixture is being economical. You need to know the number of parts you are making and the number of fixtures you need.

We have (ISO 9001:2015) certification, which shows how much we care about our customer’s wants. Our institution has qualified engineers with reputable educational backgrounds and experience to answer and give you suggestions. In short, with us, you get to enjoy the best CNC fixture design or anything related to CNC machining at a low price.

This is the last classification process and is based on the power source of the CNC fixture. Below are the six types of CNC fixtures based on the power source.

CNCfixture manufacturers

Also, with CNC work holding fixtures, the tool moves when the workpiece moves. With jigs, the tool is always stationary.

Worst Case scenario, as expected, predicts the largest range of variation. That is, under Max Condition, the clearance could be up to 0.95, however, under Min Conditions, there would be interference (blocks won’t fit in the pocket), as shown by the negative sign.

CNC milling is simply a cutting CNC machining process. In this process, the computer directs the cutter to cut the required part of the workpiece away. Milling fixtures are CNC fixtures used in this process.

A special fixture is a CNC fixture ideal for a particular workpiece. When used with this particular workpiece, they offer a load of advantages in terms of stability. There is also a quicker operation and convenience during use.

CNC fixture is an important tool that ensures conformity and interchangeability during the machining process. In other words, it encourages a smooth manufacturing operation.

Note about Sigma Level: This allows you to specify the manufacturing capability for a specific dimension. For example, if the manufacturer of a part can achieve 6sigma production, this column would allow you to specify this by entering a value of ‘6’. However, if left blank, a standard sigma level of ‘3’ is used. This means that “Tolerance = ±3σ”

Classification of CNC work holding fixtures is something most people familiar with the tool don’t get. Yes, it is not that straightforward. Since it is not straightforward, it is frustrating for beginners to understand the tool and the idea. However, with this ultimate guide, you have nothing to fear. This section will introduce you to the types of CNC fixtures from a different point of view.

A modular fixture is easy to reconstruct and reconfigure to fit any workpiece. They come from interchangeable components and are ideal for handling many workpieces. You can also dismantle the fixture after concluding the process. Modular fixtures give a better and more flexible manufacturing process.

CNCfixture components

In the picture below you can find examples of different types of tolerance. For the purpose of tolerance analysis, all of these are equivalent and Equal Bilateral Tolerancing must be used.

CNCfixture clamps

Starting from one end of the target dimension, draw vectors through each relevant dimension, in order to create a loop so that you reach the other end of the target dimension. Assign a number to each vector.

Note: To perform a meaningful RSS (Root Sum Square) stack-up tolerance analysis, some assumptions are made: Independent Variations, Normally Distributed Variations, and Tolerance Accumulation Linearity

An assembled CNC fixtures can only arise after considering a workpiece. The fixtures are according to the requirement of such workpiece. The assembling is via a special method. Depending on the need you can remove or reuse them when necessary.

Generally, you can reach a valuable conclusion on CNC fixtures based on CNC machining operations. Every CNC machining operation that requires the need for a fixture has the name of the operation. Therefore, you can have others such as CNC honing fixtures and CNC lapping fixtures.

Drilling is a popular process in the manufacturing process, and it is more popular in CNC machining. It simply means making a hole in a workpiece. CNC fixtures used in CNC drilling are called CNC drilling fixtures.

CNC fixtures are an important tool with a shroud of mystery around. However, this article demystified the tool in terms of its types and functions. After going through it, you will understand the process and the little things you need for a smoother operation, in between when you think of smooth operation and high quality at a low price, think Rapid Direct.

It is used in CNC milling, CNC turning, CNC planning, CNC slotting, and CNC grinding. This will also lead to the types of CNC fixtures which we demystified below.

CNC boring is a CNC machining process in which a tool is used to enlarge holes already drilled using CNC drilling. The fixtures used in this process are CNC boring fixtures.

When classifying based on CNC operations, there are five types of CNC fixtures. Below is a little introduction to the CNC fixtures.

CNC work holding fixtures use these two properties in their functions. For example, positioning and clamping play a major production role in the automotive industry. There, they secure and guide vehicles through the welding and assembly process.

CNC machining encompasses a variety of tools used in different capabilities. Without proper understanding, it can be hard to understand using the tools. An example of such tools is the CNC fixture, also known as CNC work holding fixtures.

Combination fixtures come in different sizes and shapes. They are ideal for handling many workpieces of different sizes and shapes based on the machine tools.

All tolerances must be symmetric bilateral. In this example, dimension 1 is given as unilateral. In order to convert it, we must center the nominal value and give it an equal bilateral tolerance. This results in: 35.95 ± 0.05

Additionally, the adjusted RSS analysis is performed. This analysis is more suitable for high-volume production processes where the mean value of a process may be shifted by 1.5σassembly

Their major difference is in their main functions where a Jig works to guide the cutter’s movement. A CNC fixture, however, does not guide a cutter. It only secures, supports, and stabilizes the workpiece during the manufacturing process. When the CNC fixture is used, the tool must also move when the workpiece moves. With jigs, the tool is always stationary.

CNC turning is a CNC machining operation in which parts of a workpiece are removed while rotating on a single axis. Turning fixtures are CNC fixtures that are used during this process.

Assign a positive direction. In this case positive will be towards the right, so that vector 1 will have a positive value, and vectors 2 and 3 will have negative values.

CNCfixture plate

Using the CNC fixture or getting to know the right CNC fixture design comes with understanding many things. Below are some things to know whether you already have a cnc fixture plat or you need a custom CNC fixture.

You can also say CNC work holding fixtures reduce the amount of effort human exerts in a manufacturing process. With this, many will compare them to jigs. However, they are different. A jig works to guide the cutter’s movement. However, CNC workholding fixtures do not guide cutters. They only secure, support, and stabilize the workpiece during the manufacturing process.

You might need to reference important workpieces on the tool if you value lesser operational time. However, you should not reference many surfaces to avoid confusion.

The way you clamp has a huge effect on the quality of the products. While you might think the best thing to do is to clamp well to secure the workpiece, do not.

The calculator also does a Root Sum Square (RSS) type of analysis, which is essentially calculating a standard deviation for the assembly, thus creating a bilateral tolerance for the assembly: Toleranceassembly = ±3σassembly. This shows that in most cases both blocks will fit inside the pocket, and interference is not likely.

You can categorize CNC work holding fixtures based on their uses. CNC fixtures under this category are of five types. Below is a little introduction on the five.

If you want to produce high-quality machined parts with a sleek appearance, it’s essential to consider some critical factors related to CNC machining.

The extremely high level of precision needed within the aerospace industry makes CNC machining a suitable manufacturing process for the sector.

Using CNC machining comes with understanding the operations and tools involved. In terms of getting CNC fixture design or a simple custom CNC fixture, you are guaranteed the best at Rapid Direct.

Two blocks are to be inserted in a pocket, as shown below. We would like to understand what is the clearance that we will have between the blocks and the pocket. Dimensions and tolerances are provided in the image.

There are many types of CNC fixtures based on three categories. Go through the article on the types of CNC fixtures under each category.

CNC fixtures

CNC work holding fixtures make sure the workpiece is fixed correctly on the machine relative to the machine tools. This is also to make sure that the machine surfaces meet the requirements.

The best definition to give a CNC fixture is that it is an agent of stability and positioning. It is a work-holding device with wide uses centered on securing, supporting, or mounting a workpiece correctly on the CNC machine.

We are a manufacturing company with the right background, vision, and capability to deliver the best. It is this we focus on when making or designing CNC fixtures for our customers.

CNC workholding fixtures contribute to your manufacturing operation’s tolerance. Therefore, it is important to make sure its setting improves accuracy.