CEMENTED CARBIDE INSERT,CNC LATHE TOOL,FACTORY IN CHINA

CNC Automatic Lathe for Precision Parts

Marubeni’s R07 Cincom sliding-headstock-type CNC lathe offers a maximum machining diameter of 7 mm. Designed for small-diameter parts, the lathe accommodates a range of high-precision workpieces for specialized parts.

The subspindle delivers 10,000 rpm, and a compact rotary guide bushing unit enables metalcutting speeds as fast as 12,000 rpm. Without the rotary guide bushing, cutting speeds can be as fast as 16,000 rpm. The lathe uses linear motors to drive the Carbide End Mills for Hardened Material slide and toolposts for faster part processing and quieter operation. A scale feedback control system also is used with all axes.

Rotary tools are part of the lathe’s gang toolpost, enabling the machining of small-diameter parts requiring processes such as polygon turning and end-face drilling. The machine uses two independent toolposts to increase operation Carbide End Mills for Steel efficiency, the company says. The chuck also can be opened or closed without decreasing the speed of the spindle motor, reducing non-cutting idle time.

An optional ALPS automatic bar loader is designed to grasp and feed small wire-like bars into the machine. A vacuum-type part-removal system and carousel workpiece separator also are available.

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Swiss Turning Center with Automation Options, Four Tools in the Cut

A new sliding/fixed headstock Swiss-type turning center will show its wide range of capabilities at IMTS 2018, booth 338136. The Traub TNL20 can be equipped to use up to four tools simultaneously for minimum change-over and cycle times even for complex parts. An optional six-axis robot cell integrated in the machine can load blank shafts or chuck parts. The machine will be of interest to connector and medical manufacturing users.

The TNL20 provides eight stations per tool carrier with three driven tools per station, so up to 24 tools per turret can be deployed with chip-to-chip time of just 0.3 sec.

The TNL20 is available in two versions. The TNL20-9 has nine linear axes, two turrets (each with Sandvik Inserts eight stations, max. 12,000 rpm, 2.0 kW), a back-working attachment (four stations), and an autonomous counterspindle. The TNL20-9 can deploy three tools simultaneously.

The TNL20-11 is equipped with an additional front-working attachment (six stations, three of which are live, max. 12,500 rpm, 2.0 kW) on an autonomous X/Z slide. By the interpolation of the H indexing axis of the front-working attachment with the X axis of the autonomous compound slide, Y-axis machining operations or tool offsets can also be easily performed with the front-working attachment on the main spindle. At this equipment level, it is also possible to cut with up to four tools simultaneously to reduce machining times. The TNL20-11 includes a second upper tool carrier with six stations. Three tool positions are live, and one is equipped with a double holder.

Chamfer Inserts Watch a video of this revolutionary machine in action.

INDEX Corp.

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Doing More with a Live Tool Lathe

Owner Robert Johnson says the shop solved the problem with an end mill that cuts with less force. The four-flute Sasquatch tool from Gorilla Mill includes a roughing design on two of the flutes that shreds the material. The other two flutes are finishing edges that cut at a slightly larger diameter. In effect, the roughing flutes break up the material and the finishing flutes clean up these passes. With this tool design, Mr. Johnson says the shop can make the cut on the stainless steel part with less feed pressure. The more stable cutting Indexable Threading Insert extends the range of work he can do Metal Cutting Insert on one of his more versatile machines. 

This slot in stainless is hard to produce on a compact live-tool lathe.

The shop milled the slot effectively using this cutter that combines roughing and finishing flutes.

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For 3D Printed Implant Maker, CNC Machining Is Capacity Constraint

During the coronavirus period, Tangible Solutions, which makes medical implants through additive manufacturing (AM), has not slowed down at all. To the contrary, with elective surgeries being delayed, Hitachi Inserts implant suppliers are ordering more inventory to stock up to get ready for the surge. Tangible is now 3D printing implants at the rate of about 1,000 per week — its highest sustained rate of production yet.

On “The Cool Parts Show,” the video series I co-host about production parts made via AM, we recently checked in with Tangible Solutions’ co-founder Chris Collins to learn about this production. The challenge he sees in maintaining this rate relates to CNC machining.

In fact, in spite of the difficulties with interviewing given social distancing precautions, the company has been seeking to hire another machinist as part of its response to the business demand. 

Metal AM parts typically need precision machining. Operations required for Tangible’s implants Carbide End Mills for Hardened Material start with precisely cutting the parts from the AM build plate, then routinely include drilling or reaming as well as tapping and profile milling. The full productive capacity of Tangible’s metal AM machines (powder-bed fusion machines from Concept Laser, now part of GE Additive) has not been realized yet, but the capacity of its five-axis machining centers from Hurco might be coming close. As a result, Mr. Collins says a new machine tool purchase is liable to come before another 3D printer.

Learn more in this episode of “The Cool Parts Show” below, or read the episode transcript here.

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5 Common Mistakes When Using CNC Machines

When CNC machines are properly used, they are flexible, productive, long-lasting and safe. A misused machine or a mishandled application can have just the opposite results.

Typically, the most egregious offenses should be obvious and easy to avoid, but not all serious issues are easy to spot. The issues presented here are commonly missed by operators and can cause big problems for your CNC environment.

Most cutting tools are available in right- and left-hand versions. The most obvious effect of tooling style is on spindle direction, but a lesser-known impact applies to CNC lathes when powerful machining operations like rough turning, facing or boring are involved.

When performing a powerful machining operation, you must confirm that the force of the operation is driven into the machine’s direction of support. Doing so will stabilize the process and ensure that the machine will continue to provide adequate support for years to come.

If you run the wrong “hand” of tooling versions, the force of the cutting operation will pull the way system apart. The only support will come from the integrity of components comprising the way system, which will degrade over time and bring about play in the way system. Eventual symptoms could include sizing issues, degraded surface finishes and chatter.

Bar operations involve machining a part, cutting it off, feeding the bar and running the next part. When a company is faced with a bar application for the first time, and especially if it does not foresee similar jobs coming up in the future, it may understandably try to minimize costs. Instead of using an expensive bar feeder, it might try to utilize an inexpensive bar puller held in one of the tool stations. With bar feeders, the bar is fully enclosed and supported within the bar-feeding device. With bar pullers, the only support for the bar will be the spindle itself.

Depending on the diameter of the spindle hole and that of the bar, the spindle may not allow the bar to flex within the spindle during machining. The faster the spindle speed in revolutions per minute, the more bending stress will be placed on the bar. Again, most bar-pulling applications work nicely if the bar is not so long that it exits the Carbide End Mills rear of the headstock/spindle. If it does by even a small amount, the rotational stress will bend the overhang by 90 degrees. If the bar hangs out far enough, it will mangle the spindle motor and anything that gets in its way.

Most M codes are like programmable on/off switches: spindle on/off, coolant on/off, door open/close, etc. If the machine has accessories like a special coolant system, rotary table or chip conveyor, M codes are likely involved with each.

Without a thorough understanding of every M code, a programmer may unwittingly cause issues with machine longevity. Many rotary axes, for instance, incorporate clamping systems that secure the rotary axis in place when necessary during powerful machining operations. This requires programmers to use an M code to clamp the rotary High Feed Milling Inserts axis prior to machining. If the programmer is unaware of the clamping M code, the clamp will not engage, and undue stress will be placed on the rotary axis.

I have seen all manner of remedies employed to keep a needed CNC machine in production, even if it had serious maintenance-related issues. Misaligned turning center headstock after a crash? The operators? programmed tapering movements for straight diameters to compensate for the misalignment. Bad check-valve in the coolant system? They included a multi-second dwell after turning on the coolant to allow time for the coolant to flow at its maximum rate. Accessory devices without confirmation signals? Operators programmed a dwell command to allow the device time to complete its activation.

No machine issue will correct itself. The problem will almost always degrade and cause serious issues.

A lot of engineering goes into every CNC application. While there may be some flexibility for certain aspects of the application, operators must always adhere to the guidelines you have implemented — and most do. However, I have seen operators manipulating functions they should not.

For instance, there are operators who increase or decrease feed rate and spindle speed override functions. While there are appropriate reasons for operators to use these functions, they may instead be increasing these functions just to make parts faster or decreasing them to keep from having to work so fast or hard. In one company I visited years ago, the operator had turned the feed rate override switch to 150%, removed the switch pointer and replaced it in the 100% position. To any onlooker, it would appear the feed rate override switch was set to 100%.

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