![]() ![]() ![]() One decades-old machine manufacturer routinely delivers 12kg machines with drum RPM ranging from 35-55. The same company offers costly roasting classes, which should give readers pause. I, and every competent roaster I’ve ever worked with, couldn’t disagree more. For instance, one US manufacturer repeatedly tells customers that ROR crashes don’t matter, they confound baking with roasty-ness, and they seem to think that ROR flicks at the end of roasts are “normal” and not a problem. It’s tempting to assume that machine manufacturers are all experts at roasting, but few are. All else being equal, the Joper’s drum RPM should be higher. For example, a 15kg Joper has an unusually long, small-diameter drum, while a Probat UG15 has an unusually shallow drum with a large diameter. Please note that I cannot recommend a precise RPM level for all machines of a particular size because the proper RPM level depends on drum diameter, and two different models of 15kg machines, for instance, may have quite different drum diameters. Please don’t think that if I recommend 50-54 and your machine clocks in at 55 that you have a problem you don’t. ![]() In my seminars I often share this table of RPM recommendations. But when I see a 1kg machine delivered with 50 RPM or a 12kg machine delivered with 35 RPM, or a 15kg machine delivered with 70 RPM, we’ve crossed the line from debatable to unreasonable. I understand that manufacturers may disagree with me about appropriate RPM levels that’s fine. There are two issues around drum RPMs and new machines: delivered machines having consistently suboptimal RPM levels, and delivered machines of a particular model from a given company having wildly different RPMs. The most common inconsistency I have noticed in delivered machines has been drum-RPM count. I won’t name companies in this post, but would like to discuss a few of these recurring problems here in the hopes that roasting-machine manufacturers address these issues soon. I’ve worked with several hundred roasting machines over my consulting career and have experienced a troubling problem: manufacturers often deliver roasting machines with what I would consider defects, and then refuse to acknowledge the problems or fix them for customers. ![]()
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