The following overview lists each individual coin in chronological order, which was milled live during the IGUANA MILLING CHALLENGE. In addition to microscope images, the corresponding surface measurements and tool test reports are available for each coin.

In electrode production, common surface qualities are N5-N7. The finely finished workpiece surfaces achieved during the live event with Ra < 0.3 (N4-N5) are better than the qualities required on the market. Even finer quality levels (N1-N3) with Ra < 0.1 count as a mirror surface and are only very rarely used in copper processing.

Now discover the difference of the IGUANA tool used before and after the live milling event. As a basis for comparison for the subsequent measurement results, the mold was already measured in detail in advance: on the left, the results of the IGUANA cutter at a runtime of 0 hours and on the right the comparison after incredible 641 hours and a covered milling path of more than 27 kilometers.

After tool use, the tool shows neither wear nor a relevant change in shape. The surface measurements reflect the programmed roughness of Ra 0.25 within the measurement and manufacturing tolerance. Based on the surface optics, it can be seen that the traverse paths of the machine are very accurate. Despite the tool size (Ø 1 mm), the contour was machined very precisely and without burr formation at the contour transitions, which additionally speaks for the repeatability of the machine/tooling combination.

IGUANA milling cutters are manufactured to a tolerance of < 0.002 mm. Although the IGUANA milling cutter used has a minimal form deviation in the center due to the manufacturing process, it is within the tolerance range both before and after the event and therefore does not show any wear whatsoever.

Further measurement results can be found in the booklet.

Customer Information Digital Security

At ZECHA, we invest a great deal into the security of our systems.

For the benefit of our partners and employees, we have worked on security features that aim to help us spot dangers and to make our cooperation more secure. Our security features are clear and transparent but can obviously never provide one hundred percent protection against risks. If you are unsure, you should never trust emails or information without checking.

We recommend that you read the latest information on staying safe online from the BSI (the German Federal Cyber Security Authority). BSI E-Mail-Security

We have adapted our SPF to enable you to use it for your systems:

If you have any questions, please email us at This email address is being protected from spambots. You need JavaScript enabled to view it.or get in touch with us at our headquarters:

Tel.: +49 7232 3022-0
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