Originally Posted by
Drew Wiley
It's always been my opinion that the standard Jobo motors have less than ideal gear ratios. They run too fast with insufficient power for larger solution volumes.
I don't know why any developing process needs that kind of RPM, and for some things it's a distinct disadvantage. 30 RPM is plenty fast, though I tend to rev
the speed up for rinse cycles. Dual-direction rotation is sometimes helpful, and I too have that feature on my roller drives. But one distinct improvement over any of em that I employ is that one out of the four rollers is eccentric, so that it very slightly rocks the linear direction of the drum with each rotation, hence minimizing the risk of streaks along the plane of rotation. Some processes are more finicky than others, so it's helpful to have various options on the drive system.
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