Edge Finder Tool Guide for CNC Beginners | Uses & Working
Accuracy in modern machining cannot be overemphasized. Whether you are using a milling machine or a vertical machining center, one of the most important considerations in the machining process involves the accurate identification of the edge of the workpiece. Here is where the Edge Finder Tool comes into play.
To those who are new to CNC machining, learning more about what a Finder Tool is, its importance, and its workings is vital to ensure efficient CNC machining processes. This article contains all that you need to know regarding this topic.
Introduction to Edge Finding in CNC Machining
However, before commencing with cutting the workpiece, it becomes necessary to find out the position of the workpiece through the CNC machine. This can be done by using reference edges on the material, which will form part of the coordinate system that will determine how the work will be performed.
There is a special tool known as the Edge Finder that plays a very significant role in helping operators find out the exact location of edges on the workpiece. Such devices are commonly used in milling machines as well as VMC systems.
If this process is not followed properly, then the CNC machine can never give accurate results, regardless of its technological advancement.
What Is an Edge Finder Tool?
An Edge Finder Tool is a highly accurate device that is employed in determining the edges of a piece of material during the machining setup process. The edge finder is usually placed in the spindle of a milling machine or VMC and turned at a slow rate.
The edge finder device basically comprises two main components: a cylinder shank and a probe tip. When the probe tip makes contact with the surface of the material, it moves slightly, thereby determining the exact location of the edge of the material.
By keenly observing the probe tip's movement, the machinist can identify the exact edge point of the material.
Why Edge Finding Is Important in CNC Machining
Positioning plays a vital role in effective machining. Edge finding guarantees that the CNC program begins its cutting process from the right point in the workpiece.
Some of the benefits of having a finder tool include the following:
1. Increases Machining Accuracy
The correct detection of edges increases the accuracy of the cuts.
2. Prevents Wastage of Raw Materials
Inaccurate detection of the edges leads to material wastage due to defects in the process.
3. Boosts Productivity
After detecting the edges, operations can be carried out efficiently since no further adjustment will be needed.
4. Necessary for Beginners
Edge finding is one of the initial steps to master while working with CNC machines for a novice.
Different Types of Edge Finder Tools
Various types of machining operations necessitate various kinds of edge finders. An insight into these different types is essential in selecting the most appropriate one for your operation.
Mechanical Edge Finders
This is the most popular type among machinists. This edge finder uses a spring probe that moves when contact is made with the material being machined. It is cost-effective and dependable.
Electronic Edge Finders
Electronic edge finders employ electric current in the detection of the edge of the material. The moment contact is made with the workpiece, there is an indication light on.
Optical Edge Finders
These edge finders make use of optical magnification in detecting the edges.
How an Edge Finder Works
- The working concept of the Edge Finder is quite easy but very efficient.
- The tool is mounted on the spindle of the milling machine.
- The spindle moves at a slow pace.
- The probe is slowly brought closer to the workpiece.
As soon as the probe comes in contact with the edge of the material, there is a slight shift in the position of the probe away from its center.
This shift means that the accurate location of the edge has been identified.
At this point, the operator makes adjustments in the machine coordinates.
Edge Finder for VMC Applications
An advanced edge finder device that can be utilized in VMC machinery is popular among the machining industries. Before any milling or drilling process on vertical Machining Centres, there is a need to position the parts accurately.
When using VMC machinery, an edge finder is installed in the spindle and rotated while approaching the workpiece. The operator should be keen and move the machine when the probe moves, showing the edge.
This way, the operator ensures accurate positioning of the workpiece.
Steps to Use an Edge Finder in CNC Machining
Proper utilization of an edge finder is critical in getting accurate results.
Step 1: Install the Edge Tool
The tool is inserted into the spindle, just like any other CNC tool.
Step 2: Start the Spindle
Start the spindle to rotate at a lower speed, about 500-1000 RPM.
Step 3: Approach the Workpiece Edge
Gently approach the workpiece edge with the spindle.
Step 4: Watch Out for the Probe
The probe will indicate that the edge has been found once it starts moving away from the center position.
Step 5: Establish Machine Zero
Establish the machine zero coordinates to set the reference point.
These steps are easy to follow for beginners.
Applications of Edge Finder
Finder tools find widespread applications in different types of machining activities. They are crucial in preparing machines prior to the start of the cutting process.
CNC Milling
In cases of CNC milling, an edge finder facilitates establishing the appropriate starting point for cutting tools.
Precision Machining
For high precision machining of parts, accurate measurement of edges is a necessity.
Tool Setting
A finder tool is employed in the preparation of work pieces on machine tables.
Alignments
Edge finders are also applicable in alignments in machining operations.
Edge Finder vs Other CNC Measurement Tools
Edge Finder: It is used to find out the exact edge of a workpiece before commencing any machining process.
Dial Indicator: Useful in measuring runout as well as checking the alignment of machine elements.
Touch Probe: It is an intelligent measuring device that automatically finds out the locations and dimensions of the part in CNC machines.
Height Gauge: Commonly used for measuring vertical dimensions and marking heights on the workpiece.
Even though all of the above tools serve various functions in machining operations, an edge finder still proves useful for manually finding workpiece edges.
Tips for New Machinists Using Edge Finders
It requires skill and effort to use edge finders effectively. Some important tips to help you learn better:
- Always use the spindle speed at its lowest limit during edge finding.
- Move slowly towards the workpiece to prevent damage to the probe.
- Ensure that the workpiece is securely held by the chuck.
- Maintain the tool in a clean state.
- Try it on scrap pieces before using it on critical parts.
Following these tips, one can become an expert machinist faster.
Maintenance Tips for Finder Tools
Maintenance is crucial for maximizing the lifespan of the tool and ensuring it performs consistently well.
- Keep it in its protective casing.
- Always clean it after using it.
- Do not drop it, as it might affect the probe.
- Check the spring assembly often.
Good maintenance of your CNC machine tool accessories will ensure that you have accurate machining.
Conclusion
For any beginner in the field of CNC machining, finding out how to identify workpiece edges is important. Using an Edge Finder, one can accurately establish reference points for machining purposes.
Through proper education about finder tools, a beginner can significantly increase his/her chances of achieving higher machining accuracy and productivity.
FAQs
Q1. What is the primary function of the edge finder tool in the machine shop?
The purpose of edge finder tools is to determine where exactly the edges lie on the piece of work that has been chosen for machining.
Q2. What should be the speed of the spindle during the use of an edge finder?
In general, a speed of 500–1000 RPM is appropriate for running the spindle during the application of edge finders.
Q3. Can beginners successfully work with an edge finder?
Yes, edge finder tools are relatively easy to work with and represent one of the first tools that CNC beginners learn to handle.
Q4. How does an electronic edge finder differ from the mechanical one?
The difference is in the principle of operation, namely, mechanical edge finders rely on springs, whereas electronic finders use electricity.
Q5. Are edge finders used exclusively in CNC machines?
No, edge finders may also be utilized in manual milling machines..