At CMZ we have an online shop for tool holders to suit a variety of production needs. With our aim of continuing to commit to a “made in Europe” product, we have over 40,000 m2of facilities so we can undertake 80% of the production process. And so, we are able to manufacture tool holders for use with our CMZ lathes.

Feb 21, 2020 — These make the cutting process faster than with a regular end mill. The cut bits of metal are smaller than usual and therefore easier to clear.

2022427 — A CNC lathe(CNC turning machine) is a machine that spins material around a central spindle and a fixed cutting tool.

The tool holder is an attachment system for the cutting tools used when machining on a lathe, or any other machine tool. That is, tool holders are used to attach a cutting tool during the machining process. They also facilitate torque transfer from the lathe spindle to the cutting tool.

There is a term within Dynamic Milling that takes into consideration the radial chip thinning effect which happens at low radial depths of cut to an over proportional increase in the corresponding feed rate per tooth. This is referred to as High Feed Machining (HFM).

Finally, another of the interesting technical characteristics of some tool holders is that the cutting fluid can be applied on the outside (external) and inside of the tool (internal) There is a valve to select how the cutting fluid flows onto the cutting tool.

Chip Thinning Effect At 50% radial engagement or greater, up to full slot (Ae) the average chip thickness is of course equal to the feed rate (fz). Decreasing the radial engagement below 50% while maintaining a constant feed rate leads to an over proportional decrease of the average chip thickness (hm). To compensate for this decrease and bring the chip thickness back to optimum, the feed rate per tooth must go up – again over proportional. As every material and machining situation has an optimum chip thickness therefore the factor of increase can be very high. At the same time, the cutting tool speed can also be increased, again over proportional, as the tool has less time in cut and less heat is created. This combination of increased feed and higher speeds allows for maximum increases in Metal Removal Rates (MRR).

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For example, a common bad practice which should be avoided is to secure the cutting tool into the tool holder while it is assembled in the turret. This practice creates deformations in the track the tool holder flange travels along when the turret turns.

In this case as well, there are multifunctional tool holders which offer many advantages and high flexibility for machining. There are tool holders which can be used for internal and external machining. Work is done simultaneously with two tools mounted in the same turret. While one tool works on the left spindle centre line, the second works on the right spindle centre line at the same time. These tool holders, known as double tool holders, are of great interest for anyone wanting to take their machining to the next level.

Additionally, and even more interestingly, was the fact that respective cutting forces stayed the same or even slightly decreased! This outcome (actually, a patent at that time) is the basis for all High-Speed Cutting (HSC), which includes High Speed Milling (HSM). This method of machining allows one to go as fast as the machine and the material being cut allows – in theory and in practice.

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Dynamic Milling on the other hand keeps radial engagement low but increases cutting speeds and feed rates to compensate for any productivity loss. By optimizing the cutting parameters as described above, the resulting cutting forces and cutting temperatures are reduced. As a result, tool life is extended substantially, along with improvements in the cycle time, creating an overall benefit in the cost situation of producing the workpiece. Ideally, dynamic milling will utilize the full length of the cutting edge and incorporate tools with more cutting edges than traditional methods would allow. The longer length of axial engagement and more cutting edges will increase the so-called Axial Contact Points which will stabilize the end mill and minimize vibrations.

There are different types of tool holders for different applications. There are two main groups: driven tool holders and static (non-driven) tool holders. Driven tool holders:

The correct choice of tool holder is essential for optimising machine performance and ensuring precision machining. Many characteristics influence the choice of tool holders best suited to your production needs. These characteristics include:

CNC lathes are made up of many elements to ensure they operate correctly and deliver the desired geometry. Tool holders are an essential part of the process and a deep understanding of their technical specifications is fundamental for choosing the right one. The following article provides an in-depth discussion of what tool holders are, the different types available and how to choose the most appropriate one for your production process.

The second part to High-Speed Cutting is High Efficiency Milling (HEM). This Milling strategy targets constant tool engagement and minimization of air cutting or other unproductive moves of the machine and respectively of the tool. Basically, it optimizes the tool path to save time independent from cutting parameters.

Combining Machining Strategies In the early 1920’s, a gentlemen called Solomon, wanted to know what would happen when cutting speed is increased above what was normal at that time. The outcome of his extensive testing developed into what is now called the Solomon-Curve. This states that beyond a certain cutting speed, temperatures are no longer increasing.

They are mainly used in a wide variety of CNC lathe applications. Different tool holders are required for different types of machining or cuts. It is essential they ensure high geometric accuracy to guarantee the quality of the finished parts. Maintenance is also crucial, because a tool holder with signs of excessive use can lead to costs due to defective parts. For that reason it is advisable to conduct thorough routine checks and ask your supplier for the estimated change date.

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As a side note. All of this applies to roughing of course. Finishing does not optimize chip thickness but cusp height to achieve best surface qualities and highest dimensional accuracy. < Chip thinning allows higher feed rates and optimizes same time >

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At the CMZ store you will find a wide range of tool holders and you can see what’s in stock in real time. As the store is open 24 hours a day and has a fully mobile friendly design you can buy tool holders wherever you are and benefit from a 20% discount (already included in the price shown) compared to buying through the after sales service department.

Traditional Method and High Velocity Milling Traditional roughing comes along with heavy radial engagement, up to full slot. As a result, the chip thickness is inconsistent and a wide chip shape creates a challenge for chip evacuation. Also, much more heat is introduced into the tools cutting edge along with high and varying cutting forces. To prevent accelerated wear, optimal cutting speeds and feed rates are not able to be achieved. Instead, machining parameters are kept to the lower end of the scale. It is dependent upon the tool’s capability and the machinability of the material on how much axial engagement is possible, typically not much.

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As the traditional method typically has only one or two Axial Contact Points there is a risk that one even further reduces the axial engagement to prevent vibrations. This could lead to a situation where an end mill is shifting from being in the cut to not in the cut. While this situation will make the operator think it is more controllable, it is still not better than before. Instead of more axial passes, a much smarter way would be to increase the number of Axial Contact Points by increasing the axial depth and reducing the amount of radial engagement and perform more passes. This preferred method allows for more equal heat distribution along the cutting edge and greatly reduced stress upon the machine and cutting tool all the while providing economic benefit. In the next episode, we will continue with the content of Dynamic and Trochoidal Milling.

There are also tool holders with both characteristics, that is, they are both axial and radial. With these tool holders, the angle of the tool can be adjusted +- 90º, so they can fulfil both functions. These tool holders are called orientable live toolholders, and they offer many advantages for machining.

Feb 16, 2024 — Is there away to radius the corners on a right triangle that has been drawn with simple trace. I am using them for corner gussetts.

These are some of the characteristics to be taken into account when choosing a tool holder. In any case, it is important to ask a trusted supplier to advise you on the purchase of your tool holders to ensure the correct fit with both the type of tool and the way it attaches to the turret.

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