Milling machine

Henri Lesewitz

 · 27.05.2020

Milling machinePhoto: Henri Lesewitz
Milling machine
Bernd Iwanow from Saxony-Anhalt manufactures CNC parts for the automotive industry, but he dreamed of inventing a mountain bike. His Frace F160 is completely milled and is to be built in small series.

The project slipped into his life like a meteorite into the earth's atmosphere. The East German bicycle manufacturer MiFa had asked if he could develop a folding e-bike that would fit in the boot of a car. "Until then, I hadn't really had much to do with bicycles," says Bernd Iwanow, who manufactures parts for the automotive industry with his small company in the Saxon-Anhalt province. In Lossa, a village that is as idyllic as it is sleepy, located somewhere in the green waves between Sangerhausen and Weimar.

An absolute eye-catcher: the F160 is so boldly defying the existing norms that the observer is not sure whether it really is a mountain bike or perhaps a sculpture of one.Photo: Henri LesewitzAn absolute eye-catcher: the F160 is so boldly defying the existing norms that the observer is not sure whether it really is a mountain bike or perhaps a sculpture of one.Are you keen on mountain biking? Get out and go!   Order the latest issue of <a href="https://www.delius-klasing.de/bike" target="_blank" rel="noopener noreferrer">BIKE for free delivery to your home</a>, or read the digital edition for €4.49 in the BIKE app on the <a href="https://apps.apple.com/en/app/bike-das-mountainbike-magazin/id447024106" target="_blank" rel="noopener noreferrer nofollow">iOS device</a> or <a href="https://play.google.com/store/apps/details?id=com.pressmatrix.bikeapp" target="_blank" rel="noopener noreferrer nofollow">Android tablet</a> .Photo: Delius Klasing VerlagAre you keen on mountain biking? Get out and go! Order the latest issue of BIKE for free delivery to your home, or read the digital edition for €4.49 in the BIKE app on the iOS device or Android tablet .

From milled frame fragments to mountain bikes

The folding bike project quickly took shape, but unfortunately the bike manufacturer once again fell into a financial tailspin - as it had several times before after reunification - and had to file for bankruptcy. A few milled frame fragments lying in Bernd's meeting room are silent witnesses to the commissioned work that was once started full of enthusiasm. But Bernd had tasted blood. With a mixture of defiance and ambition, he decided to build his own bike. Not for commercial reasons, but because he wanted to. It had to be a mountain bike. And not an ordinary one, because there were already thousands and thousands of them.

As a producer of CNC parts, it was clear that Bernd's bike should also be manufactured in this way. Initial internet research showed what an audacious idea this was. Hardly any mountain bike in the world had ever been milled before. At least not from solid material. In 1994, Cannondale had caused a furore with the futuristic, CNC-milled V 4000. However, the spectacular project bike, developed by engineering legend Alex Pong to make the competition look like talentless backyard welders, remained a prototype.

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The then Cannondale boss Joe Montgomery had to bite into his hat in front of the assembled trade press after announcing that the V 4000 would be ready for series production in the near future. Otherwise, Montgomery said, he would eat his hat. Which he did. At the very least, he bit off a piece of his headgear and choked it down in a photo-worthy manner. That was it for milled frames for the time being. Until 2014, when the Swiss Adrian Summermatter a spectacular CNC-Fully introduced. But this too soon disappeared into the basement of mountain bike history. But when Bernd saw pictures of Summermatter's "Ribisu" on the internet, he was electrified. His bike should look something like this.

"It should be immediately clear to everyone, even from ten metres away, that the frame is milled. That was important to me," says Bernd. What the famous CNC bike from Pole Bicycles is not the case, he adds. The two aluminium half-shells from the Finnish manufacturer, which are bolted together, almost give the appearance of a welded frame. After almost two years of development with a few setbacks, Bernd's Frace F160 is now ready for series production. An enduro bike with 160 millimetres of suspension travel, 27.5-inch wheels and a four-link rear triangle that doesn't have a single welded seam. There is still only one available, which makes the bike even rarer than the Blue Mauritius. But that is about to change. Bernd wants to produce the F160 on request. The frame costs around 5,000 euros due to the enormous production costs, the complete bike in the configuration shown here is available for around 10,000 euros. With a weight of just under 17 kilos, the Frace F160 will not be setting any altitude records. The strengths of the CNC bike lie elsewhere. The background report and the detailed laboratory and practical test can be found in BIKE 7/2020. The exclusive video and a photo gallery can be found here.

Industrial change: When this locomotive was still doing its daily work for a state-owned GDR company, Bernd Iwanow worked as a toolmaker at the state-owned electrical combine Robotron. Today, he manufactures parts for the automotive industry with his CNC Future Technics GmbH - as well as the Frace F160 as a heart-blood-based side project.Photo: Henri LesewitzIndustrial change: When this locomotive was still doing its daily work for a state-owned GDR company, Bernd Iwanow worked as a toolmaker at the state-owned electrical combine Robotron. Today, he manufactures parts for the automotive industry with his CNC Future Technics GmbH - as well as the Frace F160 as a heart-blood-based side project.The Frace consists of eight completely CNC-milled individual segments that are connected with titanium bolts. This is where the chain stays, which consist of one part, are created. The milling tool gnaws away at the aluminium blank at up to 15,000 revolutions per minute.Photo: Henri LesewitzThe Frace consists of eight completely CNC-milled individual segments that are connected with titanium bolts. This is where the chain stays, which consist of one part, are created. The milling tool gnaws away at the aluminium blank at up to 15,000 revolutions per minute.The blank for the main frame (lower aluminium block) weighs 70 kilos. Bernd uses 7075 "aircraft aluminium". In contrast to the 7020 alloy, which is normally used for aluminium frames, this material cannot be welded. It is extremely stable and tensile.Photo: Henri LesewitzThe blank for the main frame (lower aluminium block) weighs 70 kilos. Bernd uses 7075 "aircraft aluminium". In contrast to the 7020 alloy, which is normally used for aluminium frames, this material cannot be welded. It is extremely stable and tensile.When milling from a block, you would expect a lot of material waste. But this is kept within limits. The frame is filleted fairly precisely from the blank. The remaining material is reused for other parts.Photo: Henri LesewitzWhen milling from a block, you would expect a lot of material waste. But this is kept within limits. The frame is filleted fairly precisely from the blank. The remaining material is reused for other parts.The photo shows how the frame is cut from the solid.Photo: HerstellerThe photo shows how the frame is cut from the solid.To show how little waste is produced, Bernd jigsaws the leftover pieces together. Mobile phone photos help to put the pieces in the right place.Photo: Henri LesewitzTo show how little waste is produced, Bernd jigsaws the leftover pieces together. Mobile phone photos help to put the pieces in the right place.
Frame number 1, the prototype: After spending months developing the shape and geometry, he got started at Christmas 2018. Bernd was delighted with the result. After all the parts were on the frame, however, the big disappointment. The frame was not stiff enough. The bottom bracket section had to be redesigned. "Of course I was frustrated at first," says Bernd.Photo: Henri LesewitzFrame number 1, the prototype: After spending months developing the shape and geometry, he got started at Christmas 2018. Bernd was delighted with the result. After all the parts were on the frame, however, the big disappointment. The frame was not stiff enough. The bottom bracket section had to be redesigned. "Of course I was frustrated at first," says Bernd.Prototype number 2: The bike was stiff enough and also had the "half-timbered look" that was so important to Bernd. Time for the practical tests. Bernd hired a downhill racer especially for this. "Tip-top", he summarised and gave it the thumbs up. Bernd captured the moment on a mobile phone video.Photo: Henri LesewitzPrototype number 2: The bike was stiff enough and also had the "half-timbered look" that was so important to Bernd. Time for the practical tests. Bernd hired a downhill racer especially for this. "Tip-top", he summarised and gave it the thumbs up. Bernd captured the moment on a mobile phone video.The series version with a slightly modified design and green-grey anodised surface recently passed the important EFBE test standard. The F160 is now ready for sale. Incidentally, Frace is a play on the names of milling and racing.Photo: Henri LesewitzThe series version with a slightly modified design and green-grey anodised surface recently passed the important EFBE test standard. The F160 is now ready for sale. Incidentally, Frace is a play on the names of milling and racing.The quality of the four-bar linkage is impressive. Everything is manufactured to a hundredth of a millimetre.Photo: Henri LesewitzThe quality of the four-bar linkage is impressive. Everything is manufactured to a hundredth of a millimetre.There is not a single weld seam on the entire frame.Photo: Henri LesewitzThere is not a single weld seam on the entire frame.The shock sits between two sickles that connect the top tube and down tube and simultaneously support the shock rocker.Photo: Henri LesewitzThe shock sits between two sickles that connect the top tube and down tube and simultaneously support the shock rocker.The rear triangle is particularly skilfully milled.Photo: Henri LesewitzThe rear triangle is particularly skilfully milled.Clear view through the seat stays to the main bearing and bottom bracket area.Photo: Henri LesewitzClear view through the seat stays to the main bearing and bottom bracket area.The Bowden cables are clamped into the guides and run continuously. The F160 frame does not have classic bottle cage holes. Bernd offers the option of a specially designed, screw-on holder.Photo: Henri LesewitzThe Bowden cables are clamped into the guides and run continuously. The F160 frame does not have classic bottle cage holes. Bernd offers the option of a specially designed, screw-on holder.Are you keen on mountain biking? Get out and go!   Order the latest issue of <a href="https://www.delius-klasing.de/bike" target="_blank" rel="noopener noreferrer">BIKE for free delivery to your home</a>, or read the digital edition for €4.49 in the BIKE app on the <a href="https://apps.apple.com/en/app/bike-das-mountainbike-magazin/id447024106" target="_blank" rel="noopener noreferrer nofollow">iOS device</a> or <a href="https://play.google.com/store/apps/details?id=com.pressmatrix.bikeapp" target="_blank" rel="noopener noreferrer nofollow">Android tablet</a> .Photo: Delius Klasing VerlagAre you keen on mountain biking? Get out and go! Order the latest issue of BIKE for free delivery to your home, or read the digital edition for €4.49 in the BIKE app on the iOS device or Android tablet .

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