NTK developed this latest game changing ceramic material NTK CeramiX HX5 to replace CBN. As a ceramic cutting tool specialist, NTK has been researching new advancements for ceramics in the industry for decades.

They recently introduced a new grade that matches CBN on performance.
The new CeramiX "HX5" grade provides a cost saving solution for hard turning applications.  It's designed for Hard Turning with continuous cut in the Hardness range of 55 to 66HRc

The first step toward understanding thread milling is knowing its advantages and exploring where it could fit in your operation. Although many operators would have no trouble visualizing the use of thread milling on larger size parts, advances in the technology have made it an extremely advantageous choice for even the smallest holes.

Most of our customers discovered thread milling — and Carmex — when they consulted their industrial distributors about problems they were having with taps. As parts have become more complex and materials harder to machine, the disadvantages of tapping has become more apparent.

By virtue of their design, taps are prone to breakage. The extraction of a broken tap can cause real problems in high-value parts that demand precision thread finishes — not to mention the lost man-hours involved.

A frequent cause of breakage involves chip overload, and chip removal has continually been a problem in tapping. For this reason, the use of taps on NC equipment has always presented challenges due to breakage and thread quality. A further disadvantage is the inability of a tap to thread to the bottom of a blind hole. This requires an extra allowance for clearance that is both undesirable and unnecessary.

Shorter tool life is another problem and, in automated situations, requires redundant tooling that takes up space in the tool magazine.

Thread milling, on the other hand, avoids the difficulties associated with tapping since it not only delivers better chip control but can proceed unimpeded to the bottom of the blind hole.

Because of thread interpolation and the use of solid carbide and indexable tooling, breakage is eliminated, vibration is reduced, and a more precise thread and better finish are generated. This in turn translates to greater economy through longer tool life and increased dependability, especially on CNC machines or automated equipment.

Versatility is likewise a consideration. Thread milling can be utilized on holes as small as 0.25″ up to the largest sizes. All standard thread profiles are available and, for specialized applications, custom-made tools can be produced, tested and delivered to match tight production schedules.

Besides the advantages inherent in thread milling, Carmex offers customers further benefits.

Years ago, Carmex engineers perfected the tool design they refer to as their “Helical Advantage™.” By smoothing the engagement of the tool, their products can operate at higher speeds, ensure precision threads, and deliver better overall finish. The Helical Advantage is also a major factor in extending tool life.

Before we forget, its also worth mentioning that you should also check out the Carmex Tool Wizard software to speed your start-up.

Most important, our Next Gen Tooling team is thoroughly trained and ready to assist you, not only in getting started, but in selecting the right tools for your applications.

Whether your operation involves large transfer type equipment, conventional CNC machines, automated lines, or high precision Swiss-style machining, we’ll be happy to work with you to develop the best solutions to your individual needs and advance your processes to the latest in thread milling technology.

A guest blog from BIG KAISER.

High-speed machining started getting popular in the ‘90s, especially in aerospace where they replaced fabricating processes with machining monolithic parts like wing struts from billets. Machine tools capable of spinning cutting tools at tens of thousands of RPM made it easier to produce these parts quickly.

Like machines, holders adapted. The centrifugal forces they had to manage in order to keep tools cutting correctly became extreme. The toolholding systems available at that time were found not to be as effective as the shallower 1-to-10 taper ratio of the German hollow taper shank, hohl shaft kegel (HSK) in German. The HSK has since been standardized to ISO specifications (12164-1, -2). 

HSK is now available in several sizes and forms to fit with small to large machines. For the most part, the market has settled on the form A for general milling. It has been adopted in Japan, North America and Europe and is truly one of the only worldwide-side toolholder standards. Form E or F is for high-speed machining. The forms have different features depending on the standard they follow.  
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In the end, to achieve efficient tool life, proper finish and productivity in high-speed work, holders need to be as rigid, compact and short as possible to keep the whole assembly stable. 

When it comes to balancing holders, the quality G2.5 is widely used in the industry and is described in the ISO 1940-1 (issued in 2003) standard. However, this quality class is often over-specified and is in many cases not economically or technically feasible, especially when applied to smaller and lighter tools. Standards often applied to tools are more suited for rigid rotors and are practical in a broader use for balancing.

However, it cannot be applied to a complete system of spindles, tool holders and tools adequately and within technical constraints. For example, a tool to be compliant will have to be balanced to less than 1 gmm/kg at a speed of 25,000 rpm, which in turn corresponds to a mass eccentricity of less than 1 μm. This allowable tolerance is less than the interchange accuracy for even HSK, essentially negating all the costs and time for balancing the tool to such a strict tolerance. 

For this reason, all BIG KAISER tool holders are balanced according ISO 16084 (issued in 2017) specifically developed for rotating tool systems. ISO 16084 focuses on the interaction between spindle and tool factoring in the allowable load on the spindle bearings generated by the tool’s imbalance. This load must not exceed one percent of the dynamic load capacity of the spindle bearings. 

According to ISO 16084, the allowable unbalance tolerance is specified in [gmm] and is not expressed using a special quality grade [G]. In conclusion, BIG KAISER does not indicate any G-values for balancing quality, but rather the maximum rotational speeds of the individual tool holder. 

The BIG Kiaser MEGA holder program includes a variety of styles that can be used up to 40,000 RPM. They guarantee 100 percent concentricity and runout accuracy down to .00004" at the nose. They are built specifically to withstand speed and forces required in today’s high-throughput environment.
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For more information on BIG KAISER's approach to balancing tool holders, click here. To learn more about our high-performance tool holders here.  

Not sure which level of precision you need to order for your workholding collet? Tecnicrafts has put together this easy to understand chart that explains the difference between "standard" precision and "ultra" precision for both round stock and hex stock. The tolerance is based upon your ore size.  We hope you find this helpful! Call us with questions!

Tecnicrafts Industry is an ISO 9001:2015 Certified Company

• In the production processes, the blanks are processed carefully & inspected at each stage in order to obtain a high quality Guide Bushing or Collet.
• The Technicrafts In-house specialized Heat treatment plant ensures multi-stage processing in order to achieve best mechanical properties such as hardness, springing properties.
• Technicrafts Special Purpose machines for each process supports in achieving Best Quality output consistently.
• Technicrafts is fully aware that their products are used in critical processes across industries and commit themselves to ensure uninterrupted work flow.

The anti-lift jaw system from 5th Axis is available for those customers requiring higher precision and accuracy during secondary operation machining.

The system uses a cleat and angled soft jaw to pull the jaw in and down when torque is applied to the lead screw.

Step 1
Loosen shoulder bolts and remove the standard master jaws from the vise base.

Step 2
Take the shoulder bolts and utilize them to bolt the cleats onto the vise base.  Torque shoulder bolts to 20 ft lbs.  (27.11 Nm)

Step 3
Take anti-lift soft jaw and insert the soft jaw into the cleat.  It helps if you insert the soft jaw at a 45 degree angle.  Ensure that soft jaw seats properly into cleat.

Step 4
Take soft jaw covers and place them on the backside of the jaw.  Tighten bolts to secure covers to the soft jaw.  These covers ensure that no chips on debris enter the anti-lift soft jaw.

Spindles and tool holders are in a constant battle with the forces of nature, with this battle becoming more and more difficult with heavier cuts and longer projections. Chattering and deflection have always been the bane of machinists’ existence, so much so that the sight of a long and slender toolholder will immediately cause goosebumps.

If you understand why a long tool holder behaves the way it does, you’ll know that there are ways to fight back against this bending. Every machinist knows that short and stubby holders are more resistant to deflection than long and slender holders. You’ve also probably heard that, if possible, you’ll want most of your cutting forces to be axial rather than radial.

Not only does this fight chatter in operations like boring, but your spindle also is better equipped to handle loads in this axis. However, these options aren’t always going to be on the table, especially in unavoidable long-reach situations and many milling operations.

In this constant battle with tool deflection, much time and effort has been spent designing shorter holders, stiffer tools, and clever anti-vibration geometry and materials. But oftentimes, the body diameter(s) of the holder can be overlooked as a means of increasing rigidity, especially in situations where it is all you have to work with. This is a serious shame, as you’ll soon discover.

The concept of dual-contact technology has been around for years, existing in many different forms but always with the same goal of capitalizing on this untapped potential of rigidity. For those who don’t know, dual contact refers to the shank contacting the spindle taper and the spindle face simultaneously.

Oftentimes, the solution involved ex post facto alterations to the spindle or tool holder, such as using ground spacers or shims to close the gap, for example. In other words, there was no standard solution, and if you wanted dual contact, you would have to be prepared to spend time and money either buying modified tool holders or modifying them yourself to adapt them to your spindle.

BIG-PLUS emerged as a solution to this issue. Essentially, both the spindle and tool holder were ground to precise specifications so that they closed the gap between spindle face and flange in unison (while depending on very small elastic deformation in the spindle). What this meant is that operators were able to confidently switch BIG-PLUS tooling in and out of a BIG-PLUS spindle and achieve guaranteed dual contact.

Not only that, but standard tooling could still be used in a BIG-PLUS spindle if necessary, and vice versa.

Though not technically an international standard, it’s been adopted by many machine tool builders because of the clear performance improvements and simplicity. In fact, BIG-PLUS spindles come standard on more machines than you would think. We often come across operators that have machines with BIG-PLUS spindles and don’t even realize it.

How exactly does dual contact help with tool rigidity? The torque (or moment) exerted by the cutting forces is maximized at the point where the holder and spindle meet, the base of the tool holder. With standard CAT40 tool holders, this would be the gage line diameter. When the holder contacts the spindle face via BIG-PLUS, the effective diameter would be the larger diameter of the v-flange, since this is the new anchoring point of the holder and spindle. So, you are beefing up the diameter at the point where the reactionary force is greatest.

It’s not too much of a leap to conclude that a larger effective diameter will give you more rigidity. That being said, you may still be asking yourself: does such a seemingly small increase in diameter really make a difference? To understand the effect of BIG-PLUS, you must understand the physics behind it.

Imagine a simple scenario in which a tool holder is represented by a cylindrical bar that is fixed at one end and free-floating at the other. In other words, a cantilever beam. If you think about it, this is essentially what a tool holder becomes once it’s secure in the spindle. Now, let’s introduce a radial force F that acts downward at the suspended end of the bar, which represents a cutting force you would encounter when milling or boring, for example. The bar, as you might expect, will want to bend downward. It’s similar to how a diving board bends when someone stands at the end, though less exaggerated.

It’s possible to predict the amount of deflection (or inversely, bending stiffness) at the end of this hypothetical bar if you know its length, diameter and material. The expression below represents the stiffness k at the end of the bar where d=diameter, L=Length and E=Modulus of Elasticity

I won’t ask you to do any math here, I just want you to look at the equation. We can see that increasing d will increase the value of k, while increasing L will decrease the value of k, since it’s in the denominator of the equation. This certainly makes sense if you think about it: a short and squat bar (large d, small L) will be more rigid than a long and slender bar (small d, large L). 

Something interesting to note is that d is raised to the 4th power, while L is only raised to the 3rd power. Diameter affects rigidity an entire order of magnitude more than the length does. This is where the power of BIG-PLUS comes from and is why a small increase in diameter can have such a powerful effect on performance.

For a CAT40 tool holder, the gage line diameter is Ø44.45 mm and the flange diameter is Ø63.5 mm. Let’s imagine two bars of identical length and material, so L and E remain unchanged. One bar has a diameter of Ø44.45 mm (standard CAT40) and the other has Ø63.5 mm (BIG-PLUS CAT40).

If you were to plug these values into the above equation for comparison, you would find that the BIG-PLUS holder results in a k value that is around 4 times greater than the standard bar. Based on this comparison, you could say that a BIG-PLUS holder is 4 times as rigid as an identical standard CAT40 holder, because it is 4 times as resistant to deflection.

Think of the tool life and surface finish improvements you would see with a tool that is 4 times more rigid, not to mention the reduction in fretting and potential for reduced cycle time. You would get similar results if you were to make the same comparison for CAT50, BT40, BT30, etc.

If you’re still not convinced, we can also compare the rigidity in this way: Let’s say there is a Ø63.5 mm BIG-PLUS CAT40 bar of some arbitrary length. One of our more common gage lengths is 105 mm, or just over 4 inches, so let’s use it as an example. 

You’re probably wondering, at what length would a comparable standard CAT40 holder have an equal stiffness? If we take our stiffness expression and set it equal to itself (one side representing BIG-PLUS, the other non BIG-PLUS), we can plug in this BIG-PLUS holder length and our known diameters to find our unknown non-BIG PLUS length:

What does this mean? A BIG-PLUS holder of around 4 inches or 105 mm in length will have equal rigidity to a standard CAT40 holder of around 2.5 inches or 65 mm in length. Any experienced machinist will know quite well the difference in rigidity between a 4-inch long holder and a 2.5-inch long holder.

If this is true, we can say that implementing BIG-PLUS is equivalent to a 40% reduction in length in terms of rigidity. Theoretically, a BIG-PLUS tool holder will behave like a standard tool holder that is nearly half of its length! 

Obviously, we’ve used simple and idealized cases here to represent the complicated and dynamic world of metal cutting. Tool holders, of course, don’t have uniform body diameters or materials and the cutting forces usually aren’t acting in one direction in a constant and predictable way. If our holder necks up and down to different body diameters along its length, which is realistically what happens, each of these sections would be its own microcosm of “beam” that would influence the overall behavior (at that point, finite element analysis on a computer becomes the only practical way to predict behavior). 

So, will the advantage of BIG-PLUS really be as dramatic as our hand-calculated classical beam theory suggests? Probably not, but it depends on the tool holder/tool. Most cases will follow our simple model quite closely in practice; others not so much. If nothing else, we’ve demonstrated how dramatically the flange contact of BIG-PLUS can influence rigidity, at least in a purely mathematical sense. 

As if you needed any more reasons to be on the BIG-PLUS bandwagon besides increased rigidity, you will also eliminate Z-axis movement at high speeds, improve ATC repeatability and decrease fretting. This means that you will take heavier cuts, scrap less parts, and increase tool and spindle life.
BIG-PLUS isn’t a new idea by any means, but with a proven track record of tackling tough jobs, it’s hard to imagine working in a modern machine shop and not taking advantage of what it has to offer.

If you’re still not convinced, we can also compare the rigidity in this way: Let’s say there is a Ø63.5 mm BIG-PLUS CAT40 bar of some arbitrary length. One of our more common gage lengths is 105 mm, or just over 4 inches, so let’s use it as an example. 

You’re probably wondering, at what length would a comparable standard CAT40 holder have an equal stiffness? If we take our stiffness expression and set it equal to itself (one side representing BIG-PLUS, the other non BIG-PLUS), we can plug in this BIG-PLUS holder length and our known diameters to find our unknown non-BIG PLUS length:

by Alan Miller  
Originally published in Fabricating & Metalworking  Oct 24, 2018

Shrink-fit and hydraulic holders are especially useful in low clearance, tight work envelopes because of their relatively slim design. This has made them effective in moldmaking applications and more coveted since the widespread adoption of multi-axis machinery. Hydraulic and shrink-fit holders also share a middle-of-the-road gripping strength: about half that of a milling chuck and about double that of collet chucks.

These similarities are why we’re taking the time to compare the two. When it comes to deciding between one or the other, it’s the differences that will guide the choice. So let’s dig into some of the fundamental contrasts that may help you decide which holder type is best for you and your work.

When it comes to the holders themselves, shrink-fit is generally a slightly lower cost. The delicate hydraulic clamping systems built into the holders add cost when compared to the simple and solid bodies of shrink-fit holders. Where the major difference lies is in the equipment needed to heat the shrink-fit holders.

When heated to the proper temperature, the resulting growth of the ID allows the tool to be slipped into the bore. Once cooled, the holder expands, gripping the tool. This process, especially the induction heating, involves cost. Shrink-fit heating systems start at around $5,000 and go up from there. They also require fairly significant power, adding a slight ongoing expense.

If you want to see a full return on your shrink-fit investment and then some, maintenance is critical. When dealing with temperatures that can approach 600 deg F, the stakes are heightened.

This is why we recommend using dry cutting tools without oil on them. From there, diligent attention must be paid to the cleanliness of holder bores and tool shanks. Any contamination will be baked onto the metal and progressively deteriorate performance.

When it comes to hydraulic chucks, maintenance is straightforward as long as the hydraulic chamber stays sealed. To ensure the hydraulic system performs consistently, we recommend using test pins to gauge its force over time.

Hydraulic chucks are infinitely simple. A turn of a wrench locks the tool in place. When it comes to shrink-fit systems, there are a few more factors to consider when getting the team up to speed, including safety considerations. Aside from the operators who handle the tooling and heating system directly, others on the floor need to be made aware of the risk of burns.

Heating stations are usually benchtop arrangements because of the power requirements. This means hot metal will need to be transported across the floor in one form or another. Another training consideration is that tools can be overcooked, so to speak. This will cause permanent damage that harms performance. Operators must understand, know how to prevent and diagnose this.

As mentioned earlier, hydraulic chucks use a simple wrench to lock in the tool. Tools can also be swapped at the machine or offline. When it comes to shrink-fit setups, they must be done exclusively offline where the heating and cooling can be powered. Most heating cycles can be as fast as 15 seconds.

Cooling can take several minutes, even with assistance like air. Having extra compatible holders is a viable solution to speed concerns, if you’re comfortable with the additional investment. All that being said, there are significant time-saving opportunities to be found setting up tools offline. We believe strongly in tool measuring systems and recommend offline setup when and where applicable.

Hydraulic chucks have two specific advantages in terms of vibration and accuracy. The first is that shrink-fit tools and holders are dependent on the heating and cooling processes being consistent. This brings us back to the maintenance section above; the slightest imperfection in the holder bore, not to mention the natural inconsistencies in the heating and cooling processes, can be multiplied at the cutting edge in the form of vibration or runout.

There is also the chance of some variation from operator to operator. Hydraulic chucks are less reliant on these variables and their production is imminently consistent. Once a master bore is established during manufacturing and assembly, it’s a repeatable process over thousands of cycles.

This translates to consistent clamping tolerances and forces over the life of the holder. The second advantage is the natural damping characteristics that hydraulics provide. That’s not to say shrink-fit holders are ineffective in terms of vibration management. Their runout is five times better than side-lock holders.

That brings us to some application talk. While they may not be as precise, shrink-fit holders’ rigidity makes them effective in moderate to heavy milling work where clearance is an issue, and in many high speed scenarios. The superior vibration control of hydraulic chucks makes them good choices for finish milling, reaming and drilling work.

Up to this point, you may think I’m an advocate of hydraulic chucks over shrink-fit holders, but that’s not the case. We offer both products. In fact, shrink-fit holders are fundamentally the perfect tool holder. From an engineering perspective, there are no moving parts, no additional components, they use the properties of the holder itself to grip the tool and they’re symmetrically round. But as we all know, a manufacturing floor is not a perfect environment. Variables must be considered when choosing equipment.

Should the choice between hydraulic chucks and shrink-fit holders come up, the factors discussed here will help guide your choice.

With this innovative centering tool from Big Kaiser, spindles and tools can be centered quickly and easily.  It's ideal for limited spaces within small lathes.  The Centering Tool is a static dial gauge for easy centering.

• Reduce setup time
• Centering the tool holder is simplified since the dial gauge position is static and in front
• Easy setting with a fine adjustment mechanism
• Magnetic base allows for flexible mounting positions

Check out the technical video below to learn how to get center on your CNC Lathe.