lehmann rotary table free sample

The robust geared rotary tables of the 500 series are extremely flexible to use and, thanks to the combiFLEX® modular system, can be converted or extended at any time to meet new machining tasks. The rotary tables are not only suitable for positioning operation, but can also be used for short simultaneous machining operations. The preloaded gear and the powerful bearings allow high long-term accuracies as well as large spindle loads. The maximum clamping force of up to 7,000 Nm leaves hardly anything to be desired.

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Word soon spread within the F1 community regarding CNC Techniques range of capabilities and Mr Eden’s fledgling business quickly established a loyal customer base. The mainstays of CNC Techniques machining capabilities are its high-performance Hurco 3-axis and 5-axis machine tools. To provide an additional 2-axes to the company’s 3-axis machines and to add greater machining flexibility, CNC Techniques recently invested in a rotary table solution from Lehmann.

“Although we are kept busy throughout the year, our workload more than doubles in the traditionally busy F1 months of December through to February. Therefore, at this time of year, apart from working around the clock, we need to work smarter and employ equipment that provides greater flexibility. The need for machining flexibility and the requirement for an additional 2-axes on our Hurco VMX 30, 3-axis machining centre, were the major motivations behind the recent rotary table purchase.

“Even though I was aware of the excellent reputation of Lehmann products, I was open to the idea of purchasing alternative brands of rotary tables. Although, when compared to the indifferent response I received when I contacted some other manufacturers, the reaction I had from Lehmann was first-class. All of my questions were answered quickly and several constructive suggestions were made by the company’s technical staff.

“In addition to giving us the ability to achieve five-sided machining in a single setup, I was assured that a Lehmann rotary table would withstand the high forces involved in machining exotics and also deliver the standards of precision we need.

“The installation of the rotary table was carried-out by a couple of knowledgeable technicians who made all of the connections to our Hurco VMX 30 3-axis machine tool’s control system,” he adds.

“Then, whilst observing the rotary table’s try out I realised how easy it was to operate. We now use the rotary table along with our Lang Technik workholding. In addition to standing up to the machining forces used to machine exotics, the rotary table is simple and fast to operate and is making a significant contribution to our 3+2 axis machining capabilities.”

Increasingly, users of 3-axis VMCs are fitting Lehmann CNC rotary tables to their machines as they represent a cost-effective means of entry into 5-axis machining. When mounted in a VMC, the tables are able to deliver a tilting A-axis and/or a rotational C-axis.

Given the compact nature of Lehmann CNC rotary tables, they allow workholding devices to be located alongside them inside VMCs. If required they are able to remain in the machine, or they can be quickly removed and later replaced according to the machining jobs being carried-out.

By locating workholding beside the a compact Lehmann rotary table, a virtual 6-axis condition can be achieved. For example, following the five-sided machining of a workpiece held on the rotary table, without a break, machining can be undertaken on the next workpiece in a batch that is held in the neighbouring workholding.

As floor space is at a premium in most machining environments, mounting a CNC rotary table inside an existing 3-axis VMCs provides a major advantage over purchasing a large 5-axis machine tool. In addition, the cost of the table is a mere fraction that of an expensive new machine tool

Lehmann has been designing and manufacturing high-quality rotary tables for more than 40 years. The experience and expertise gained over this time is reflected in the quality of the company’s advanced products and in its exemplary levels of service.

To minimise parts and to enable the delivery of Swiss quality at a cost-effective price, Lehmann rotary tables are based on an innovative, standard modular system. This highly efficient approach allows a wide range of CNC rotary table options to be made available to meet all customers’ diverse needs.

2 Lehmann NC dividing heads with sliding slides. Both dividing heads were mounted on a manual milling machine. Have worked perfectly until the end. Complete with control, operating instructions.

Complete With DMG MORI 19" SLIMline Multi Touch 45 Degree Control Panel with Siemens Package & Pendant; Max "X" Axis = 800mm; Max "Y" Axis = 560mm; Max "Z" Axis = 510mm; 4th Axis Lehmann 500 Series, Edition 3 Rotary Table; Max Workpiece Length 1100mm; Max Workpiece Length 560mm; Max Workpiece Height 630mm; Max Weight 800kg; Field Force 5KN; (30) Tool Storage/Pockets, 80/125 Double Gripper; Single Spindle, BT 40 Taper.

Extremely dynamic short circuit protection, therefore excellently suited for rugged industrial use with high Schalthaeufigkeiten, electrical loads and harmonic components. Stable boiler. Reduced losses (Po / Pk between BA "and A-C"). Available with outer-cone Elastimold Steckdurchfuehrungen, of course, also with HV / LV-sided porcelain execution.

These devices can be called up via our online database with individually printable data sheet. The database has an internal search function and is maintained on a daily basis.

Inside the Mazak VMC, the pL LEHMANN table is positioned on the far right-hand-side of the worktable, allowing for additional vises and machining operations to take place on the left. Photos: Brent Donaldson

When is a three-axis vertical mill, equipped with an aftermarket two-axis rotary table, preferable to a true five-axis machining center? Ask Fischer USA.

At the Fischer USA headquarters in Racine, Wisconsin, a Mazak VCN 530C fitted with a pL LEHMANN 5AX rotary table allows for 3+2 (or «positional») machining, in which the rotary table positions the workpiece for three-axis operations. According to Ryan Krause, Fischer USA senior manufacturing engineer, and Michael Guzman, manufacturing engineer III, the 3+2 configuration provides the necessary machining flexibility at a considerably lower cost than a full five-axis machine (that is, one that moves all axes synchronously during the cut).

On Fischer’s shop floor, all of the machining work is spread across several CNC lathes and grinding machines, as well as a Mazak Integrex mill-turn. In 2021, the company added the 3+2 machine, which was assembled and tested with a 20,000-rpm Fischer spindle and pL LEHMANN two-axis rotary table before shipping from Mazak’s North American headquarters in Florence, Kentucky.

On the Mazak VMC, the setup often includes a Chick or Lang vise holding parts on the left side of the worktable and the pL LEHMANN two-axis rotary table holding a part on the right. A clever workholding solution devised by the Fischer USA team allows for parts positioned on the pL LEHMANN table to be flipped and machined radially and axially on both sides with the table’s ability to flip the part 180 degrees.

The second (and predominant) consideration was cost. As useful as a five-axis machining center might be, the cost differential with the three-axis machine amounted to a six-figure sum, even with the addition of the rotary table. Overall, Krause and Guzman have found that the pL LEHMANN table allows for a degree of flexibility in its approach to machining these parts that is more than sufficient.

The Fischer USA team considers the Mazak VMC and pL LEHMANN table to be a step in between the shop’s former machining routines and a full five-axis solution — a happy medium that allows running turning operations first, then handing parts over to the Mazak VMC for multiple milling operations in one setup.

On the Mazak VMC, the pL LEHMANN rotary table is positioned far to the right side of the worktable, while orienting the unit with the gear box in the back further maximizes table space. The Fischer team often sets up two parts at once: one on a vise, and one on the rotary table.

The ability to machine parts radially and axially in one setup is a prime advantage of the pL LEHMANN table. For example, machining spindle shafts once required removing the part for a second setup, using the blind holes machined in the first op to position it. But now, custom-machined soft jaws clamp the OD of the spindle shaft in a Lang vise. With the rotary table, the part can now be radially machined on one side, flipped 180 degrees by the table, then axially machined on the other in a single setup.

Similarly, the rear covers of Fischer spindles were originally produced from castings, but that resulted in high tooling costs for a low-volume part. Fischer now machines the parts from raw slugs. After turning operations, the vertical mill and rotary table can handle all milling in a single setup.

Manufacturing high-precision spindles requires high-precision machining, particularly in the case of encoder wheels. These gear wheels contain hundreds of teeth that, through an electrical sensor placed inside the spindle, encode the rotational position of the spindle shaft as well as its speed. The pL LEHMANN unit’s radial and axial accuracy, as well as its rigidity, are paramount to precisely milling these gear teeth on the Mazak VMC, Krause says. «We’re able to machine the wheel, perform a check, and we’ll have less than five microns of radial runout, which is excellent.»

Krause says the unit’s HSK «ripas» spindle interface is critical to success. «HSK» is a German abbreviation for «hollow taper shank.» This interface style, referred to by pL LEHMANN as «ripas,» differs from more common (at least in the United States) steep-taper shanks in several ways. The clamping mechanisms of HSK shanks are internal, and contain separate draw bars that lock the shank securely into the receiver. Studies have shown that the extra clamping force provides up to five times the radial stiffness of a standard steep-taper shank.

The pL LEHMANN table’s ripas unit consists of the HSK interface, the ripas adapter (the gripper unit that connects the HSK to the fixture or workholding) and the keyways that position the adapter rotationally in place. Guzman says these keys are also a differentiating feature in terms of maintaining tight positional tolerances that reduce the need for runout checks.

This level of precision also enables Guzman to create fixtures with locating pins that can be stored and reused for repeatable positioning of any given part. «The next time we want to run this part, because each fixture has a certain orientation to the pL LEHMANN table, it will be a very quick changeover. Probably under 30 seconds,» Guzman says.

This encoder wheel features hundreds of teeth that, through an electrical sensor placed inside a Fischer spindle, encode the rotational position of the spindle shaft as well as its speed. When machining these parts, the pL LEHMANN table’s radial and axial accuracy, as well as its rigidity, are paramount to precisely milling these gear teeth on the Mazak VMC.

For Krause, the choice of a a 3+2 configuration with the Mazak VMC and pL LEHMANN table comes back to cost and need. «We really wanted to go into this and customize a machine that fit our business need right from the beginning,» he says. «You could look at a lot of our work and say that it would really be nice to have a five-axis machine, but we need to have the

flexibility of very large parts on the table while utilizing the pL LEHMANN for things like axial work, radial work and angled holes. Ultimately, that meant building the most flexibility that we can for the future.»

… the Swiss manufacturer of CNC rotary tables and other components for metal machining, is an experienced machine construction company, whose rotary and swivel axes have proven their worth in production for over 40 years. In addition to these products, which often make three-axis drilling and milling machines into more productive four- or five-axis machining centers, you can also find a variety of workpiece clamping systems in the product line.

Founded in 1960 strictly as a contract manufacturer, pL LEHMANN has been developing and producing CNC rotary tables for over 40 years. With innovations and Swiss quality, the family-owned company in the Swiss town of Bärau (Emmental) succeeded in opening up new opportunities for its customers and developing lean machining solutions characterized by high productivity through use of additional NC axes. One of the highlights of the company’s history is the powerful and flexible Series 500 – developed in 2009 – which is ideal for the most demanding tasks thanks to its modular design. With the backlash-free, preloaded PGD gear unit – developed in 2014 – pL LEHMANN reached another milestone. In 2017, the company introduced, among other things, the new pL-iBox generation, making their rotary tables ready for Industry 4.0 and digital production. This was followed in 2019 by the introduction of the Series 900 DD (Direct Drive) rotary tables with speeds of up to 5,450 rpm. As an additional new product, the AM-LOCK system, a special zero-point clamping system for 3-D printing, including preprocessing and postprocessing, was presented for the first time in 2019.

Our large range of 4th and 5th axis rotary tables manufactured in Switzerland by pL Lehmann are both innovative and of the highest quality. The modular system lets you build up axis with standard products to cater for the growing needs of your business. Designed to work with almost any machine tool or control, we can offer a full installation and service package to our customers.

The innovative design of Lehmann rotary tables offer a high speed, backlash free indexing motion with higher clamping torque than any of its competitors. This is also achieved with one of the smallest footprints on the market give customers more room for second operation Workholding on the machine bed.

After adding four-axis or five axis rotary table on the machine tool, multi axis machining can be realized, which can improve the machining efficiency and yield. With the improvement of manufacturing automation in China, the demand for rotary table increases significantly.

Now, I will introduce the situation of several rotary table brands in China. We will divide them into four categories: Europe andAmerica, Japan, Taiwan and Chinese brands.

Europe and America: the best selling brands in the Chinese market are Haas and Lehmann. Haas is mainly configured on its machine tools, other brands of machine tools are rarely installed. Lehmann is positioned at the high end and mainly cooperates with some high-end machine tools. In addition, it is also used in some occasions with high accuracy requirements, but the demand is small

Taiwan: TJR, Detron and GSA are the main brands, as well as DEX, Autocam and HW. These rotary tables are not only configured on Chinese brand machine tools, but also sold to end customers. Their precision is not high and their service life is not long, but they can meet the requirements when machining parts with low precision. Some users will consider these brands when their budget is limited. Among these brands, TJR has the best sales volume, with an annual sales volume of more than 10000 sets, because they have the most complete distribution network, complete models and cheap prices.Most importantl

China: there are many locally four-axis brands in China, such as Gutia,Silvercnc, Blue tech, CP and Deshu. The product quality of these brands is comparable to that of Taiwan. Due to more favorable prices and fast delivery, they have occupied the market of most Taiwan brands. The four axis of Chinese brands mainly adopt roller cam structure or harmonic structure. The wear resistance of roller cam is better than that of worm gear, with long service life and good accuracy retention. The price of harmonic reducer rotary table is low, which is suitable for 3C industry. These two structures meet the needs of the market and have been recognized by customers.