Hi Camme,
Accuracy. That's our C800U's greatest feature. We build gauges and fixtures for the automobile industry, so accuracy is very important to us (we usually work to 10x greater accuracy than the parts being checked). We have found that we can cluster any amount of holes in a single detail, and hit them all within .02mm.
It is a very solid machine. We ran test cuts on both the Hermle C800U and the DMG evolution 70. The Hermle seemed to be a much more solid machine, whereas the DMG seemed to not be built with longevity in mind. Of course that was my perception, others may disagree.
The trunion on our machine can rotate 110° in both directions. While I limit the rotation to only 20° in the + direction (so that the trunion doesn't block the view of the cutting) having that 110° in the - direction means that we can avoid extra set-ups when cutting most undercuts. By the way, limiting the + travel only means that the post rotates the rotary table 180° so there is no loss in capability.
The only negative thing I can say about it is that it has little "crush cans" in the spindle to prevent damage if you crash it (in the Z). It doesn't take much to crush them, and that requires a service tech to come and replace them. Our machine was the first one that our distributor sold, so we were used for training. We are not too happy with the service we get, but that is not Hermle's fault. When dealing directly with the head office, we have been more than pleased with the response. Our next machine will be purchased directly from them.
Hope this helps,
Dan
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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