{"id":86061,"date":"2025-03-11T15:55:47","date_gmt":"2025-03-11T14:55:47","guid":{"rendered":"https:\/\/www.lach-diamant.de\/news\/how-super-abrasives-conquered-the-world\/"},"modified":"2025-03-25T16:20:05","modified_gmt":"2025-03-25T15:20:05","slug":"how-super-abrasives-conquered-the-world","status":"publish","type":"post","link":"https:\/\/www.lach-diamant.de\/en\/editorial\/how-super-abrasives-conquered-the-world\/","title":{"rendered":"How Super-Abrasives Conquered the World"},"content":{"rendered":"\t\t
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Horst Lach, protagonist in the development and application of super-abrasives, celebrated his 64th anniversary at Lach Diamant on October 1st, 2024.<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Horst Lach has been known for over six decades as an innovator in the development of diamond tools for the industry and is absolutely recognised as a pioneer. Still, at the age of 85, he is working for his company LACH DIAMANT\u00ae every day. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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journal of hp tooling<\/h5>

This article was published by hp tooling<\/a> (issue #1 | 2025).<\/p>\n\t\t\t<\/div>\n\t\t\t

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DOWNLOAD Download<\/title><\/svg><\/a><\/div>\n\t\t<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Horst Lach, born in 1940, manages LACH DIAMANT\u00ae together with his son, degreed engineer Robert Lach; the company was founded by Jakob Lach in 1922.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Does LACH DIAMANT present 117 years of expertise and know-how?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Actually, the company was founded only 103 years ago, but as the founder\u2019s son, Horst Lach, recalls \u201cthe acquirement of knowledge began already in 1908 when Jakob Lach started his apprenticeship as a diamond cutter.\u201d When wage grinding became unprofitable after World War II, Jakob Lach focused on his second company, which he had founded in the 1930\u2019s for the sale and distribution of industrial diamonds. \u201cJakob Lach \u2013 Industrial Diamonds\u201d [Deutscher Industriediamanten-Vertrieb Jakob Lach] was very successful in the Magdeburg \u2013 Leipzig \u2013 Chemnitz area (Germany) and well known among automobile manufacturing companies such as Opel in Ru\u0308sselsheim (Germany). <\/p>\n

With this, a new era had begun for the Jakob Lach company \u2013 the name LACH DIAMANT\u00ae was born. Dressing and profiling of grinding wheels with industrial diamonds (both set and rough self imported diamonds) became the primary business of LACH DIAMANT in the 1950\u2019s. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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The first company outing of the diamond grindery Jakob Lach in 1924. The founder of the company, Jakob Lach, is sitting at the right side.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Abrasives of a new age<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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After Horst Lach joined LACH DIAMANT\u00ae on October 1st, 1960, the company started manufacturing diamond grinding wheels in metal and resin bond for the grinding of hard metals and ceramics. \u201cThe development of metal-coated diamond grits by DeBeers (for example grit type RDA-MC) was instrumental, not only for the success of diamond grinding wheels in resin bond for carbide processing (e. g. LACH DIAMANT\u00ae\u2019s grinding wheel K-MC) but also for the development of carbide tools in general\u201d, Horst Lach recollects. \u201cAt the same time this paved the way for the commercial success of tool manufacturers such as Leitz, Leuco, Sandvik, Widia and grinding machine manufacturers like Vollmer \u2013 Dornhan or Biberach, Walter, Stehle and other companies like them\u201d. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1977 \u2013 at productronica, Munich, the worldwide first presentation of PCD milling cutters, saws and scoring saws for machining abrasive plastics<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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General Electric (GE), a manufacturer of super-abrasives, set another milestone with its introduction of BorazonTM (boron nitride \u2013 CBN), a modern day abrasive. \u201cFinally it was possible for tool grinders to accomplish precise circular grinding of HSS milling tools on a Deckel grinder in a one-step process \u2013 without having to continuously find new measuring points on a traditional corundum grinding wheel\u201d, Lach comments. The higher temperature resistance of the new abrasive BorazonTM-CBN (up to 1500 \u00b0 C) compared to diamond (up to 720 \u00b0 C) made this possible despite a low degree of hardness. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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The new material revolutionized the industry, and its potential for future processes and applications has still not been fully realized. It is a new material with a great deal of potential for future developments, processing, and applications for the grinding industry, as the presentations at GrindTec demonstrate. LACH DIAMANT\u00ae introduced the new \u201csupergrind- power\u201d grinding wheel and \u201cdrebojet\u00ae-plus\u201d. <\/p>\n

At the beginning of the 1970\u2019s everything in the world of tool manufacturers appeared to be \u201cjust fine\u201d, as Horst Lach remembers, until two new product innovations by GE shook the industry. These were PCD, a polycrystalline cutting material first introduced in 1973, and in 1974 CBN and PCBn, another polycrystalline cutting materials. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1973 \u2013 the starting point of the first success story due to PCD \u2013 more efficient copper collector machining<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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1973 \u2013 for the very first time, GE offers polycrystalline diamonds for tool manufacturing<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Historically interesting is the fact that GE researchers came across cubic crystalline boron nitride (CBN) early on, during their search for diamond synthesis. However, at that time they did not know what to do with this material since it had such a low hardness compared with diamonds.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Horst Lach remembers that Carboloy in Frankfurt, a GE company, already had CBN blanks in storage during the early 1960\u2019s. Later these blanks were marketed as BZN blanks.<\/p>\n

LACH DIAMANT\u00ae has been a pioneer from the very beginning \u2013 as a matter of fact since the first development, production and commercialization of BorazonTM CBN grinding wheels. \u201cWe demonstrated turning of aluminum with interrupted cuts with a new cutting material PCD \u2013 dreborid\u00ae \u2013 at the Hanover Trade Show in 1973. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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GE offered polycrystalline synthetic diamond segments with 600 and 900 angles for the first time in 1973. At the time it was very difficult to cut them out of blanks with only 0 3,4 mm, and cutting lengths were equally limited\u201d.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Beastly materials<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Grinding these polycrystalline materials was also problematic; diamond cutters, used to grinding natural diamonds, called them \u201cbeastly materials\u201d without any structure and they rejected them. LACH DIAMANT\u00ae was able to produce the very first PCD lateral turning tool on an existing Simon tool grinding machine with a diamond cup wheel in resin bond (K-MC, 125×12.5) \u2013 just in time for the Hanover Trade Show in spring 1973. <\/p>\n

\u201cWe had a Weiler turning machine with a clamped-on aluminum round part for the following demonstrations. It was covered with bores in order to simulate interrupted cutting. Without knowing an exact tool life, we had ordered one replacement tool per show day (10 days at the time!) from our manufacturing facility in Hanau. <\/p>\n

After three days we called off the special driver who transported the tools to Hanover; the PCD cutting edge worked and worked and worked, and at the time we believed we could never wear it down. We only accomplished that on the very last day of the show, when we boisterously placed a small bottle of sparkling wine into the machine… that was the starting point of PCD and the legendary dreborid\u00ae at LACH DIAMANT\u201d, describes Horst Lach with a smirk. <\/p>\n

LACH DIAMANT\u00ae had decades of experience in manufacturing and servicing natural diamonds for the manufacturing companies of copper collectors for the electrical industry, and therefore the company focused at first on those customers, such as Bosch, Siemens, AEG and this strategy proved to be very successful.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1974 \u2013 LACH DIAMOND\u00ae demonstrates for the first time the milling of plastics and aluminum with PCD at the Hanover spring trade show (image shows machining of GRP)<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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\u201cUntil then a natural diamond tool for collectors could turn between 100 and 120,000 collectors at the most. PCD dreborid\u00ae turning tool made much more economically sound numbers possible. Today, depending on collector size and cut, one tool can produce up to 220,000 collectors.\u201d<\/p>\n

Truly electrifying results were achieved when PCD dreborid\u00ae was tried out at Kautt & Bux, a manufacturer of rough collectors. Until then rough collectors had to be ground in a time-consuming process. Now this procedure could be done in a few seconds by turning instead of grinding the collectors for several minutes. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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This meant for LACH DIAMANT that they had won a key account customer right from the get-go. Both, PCD manufacturing and service could be built on this initial success.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Alternatives on the market for grinding machines<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Even diamond cutters of natural diamonds had surrendered to the \u201cbeastly\u201d polycrystalline cutting material PCD. New procedures had to be developed and at least some alternative solutions were needed on the market for grinding machines. \u201cQuick decisions were of the essence, since from the very beginning, there were a lot of potential users of PCD, including machining companies who processed aluminum, hard and soft plastics, wooden materials, green ceramics and other materials; the optimal grinding system should not only accomplish straight edges but should also be able to grind angle and radius. <\/p>\n

The final choice was a rather \u2018delicate\u2019, yet extremely precise, tool grinding machine, the Kelch SZ34\u201d. LACH DIAMANT\u00ae and the manufacturer from Southern Germany worked closely together in order to adapt the machine specifically to PCD grinding. After the production license was transferred, LACH DIAMANT\u00ae continued to build this machine under the new names \u201cpcd-100\u201d (equipped with swivel part) and \u201cpcd-300\u201d (equipped with optional adjustable spherical head). <\/p>\n

Requests to produce PCD-tipped rotating tools such as milling cutters, scoring saws and saws were fulfilled at productronica in Munich in 1977.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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LACH DIAMANT\u00ae had chosen GRP (glass fiber enforced plastic), an extremely hard-to-machine material for this \u201ctrial run of PCD-tipped rotating tools\u201d. GRP is used as base material (PCB) in the production of circuit boards. 35 hours of grinding time for twelve teeth was accepted in the false hope that \u201cwe would eventually find something better\u201d. Not at all. With the grinding technology of the time, there was no reduction possible. The initial enthusiasm of the exhibition visitors quickly gave way to accusations of withholding these cost-cutting miracle tools. Potential customers held this grudge for years. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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1977 \u2013 at productronica, Munich, the worldwide first presentation of PCD milling cutters, saws and scoring saws for machining abrasive plastics<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Machining of composite materials<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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In 1978, one and a half years after this rocky start, a memory triggered another brilliant idea. Horst Lach remembered the words of his father that \u201celectricity has a major part in grinding diamonds (he was talking about natural diamonds)\u201d. Horst Lach was reading an advertisement for Fanuc erosion machines of the former company Matra. <\/p>\n

\u201cThe reader should know that at the time GE and supplier DeBeers still used electro-plated diamond cutting wheels for cutting PCD blanks: the back of the hard metal surface of up to 6.4 mm round PCD blanks was first scored, then broken. At that time spark erosion had not yet been discovered\u201d. His interest was piqued. <\/p>\n

A visit to Matra would change the world of machining. After a first successful attempt to machine and form the electro-conductive PCD via spark erosion, this new process opened up the same possibilities for PCD which hard metals had finally established over HSS and ceramics. LACH DIAMANT\u00ae entered the market of machining wood and composite materials by founding LACH-SPEZIAL-WERKZEUGE GmbH which in turn established LACH DIAMOND\u00ae INC. for the American and Canadian markets. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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A very bright future<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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PCD diamond tools proved to be 250-300 times as efficient as hard metaltipped woodworking tools. NC manufacturing technology was soon developed into CNC technology with multi-axis machines. \u201cToday we know that this technology did not stop at metal machining. All the advancements of today\u2019s automobile, aircraft, energy (especially wind energy with CFRP wings), sports and medical industries \u2013 to name only a few \u2013 would not have been possible without diamond, without polycrystalline synthetic cutting materials, including so-called mono diamonds and CVD (chemical vapour deposition)\u201d. <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1978 \u2013 Horst Lach\u2019s discovery of spark erosion made everything possible, example: production of multiple diamond saws on LACH DIAMANT\u00ae\u2019s universal sharpening machine \u00bbDia-2200-mini\u00ab<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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After the development of spark erosion, or electrical discharge machining, Horst Lach obtained one of the first European patents. He withdrew the patent voluntarily after a Swedish tool manufacturer lodged an appeal. This discovery opened up a vision of a very bright future. Continuous innovations have proven this up to this day. LACH DIAMANT\u00ae\u2019s entrepreneurial success with erosion technology is particularly evident in its technologically mature, well-engineered erosion grinder, Dia-2200-mini\u201d, which machines diamond tools for the wood and plastics industry. With its extensive portfolio LACH DIAMANT\u00ae stands at the cutting edge of machining and grinding technology (Future for Today). <\/p>\n

Horst Lach<\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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2016 \u2013 GrindTec Augsburg: introduction of \u00bbdrebojet\u00ae-plus\u00ab as another example of non-stop innovations; contour-controlled dressing of conventional grinding wheels at LACH DIAMANT\u00ae\u2019s booth<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

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