Difficult to sharpen knives
Why do some knives take a much longer sharpening time before they begin to form a burr on the edge? Some don't even seem to be touched by the machine, while others are done in one pass.
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One of the reasons is that there are many different qualities of the steel out there.
Other resons are, how thick the blade is and if there is already a bevel established, if you sharpen a smaller angel degree on a blade then it takes longer to sharpen all the way to the egde to establish a new apex.
You can adjust the grid of the stone to coarse with the SVP-650 Stone Grader to speed up the process and the finish with a finer grid by using the finer side of the Stone Grader.
https://tormek.com/en/products/accessories/sp-650-stone-grader