EZE LAP stone out of flat by 0.15mm
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27 July 2016 at 3:01 pm #138856
I bought Coarse, Fine and Super Fine diamond stones from EZE LAP. Fine and Super Fine are convex by 0.15mm across the length. Do you think this is a problem? Or will they sharpen my plane blades just as well?
27 July 2016 at 10:40 pm #138866I would say there is no problem if it is along the length. You change angles slightly when sharpening which creates a convex bevel anyway unless you use a sharpening jig.
27 July 2016 at 10:50 pm #138867If I understand this correctly, you have a 0.15 mm (or 0.006″) crown in your diamond plate in the length direction. If there is no curvature across the width of the plate, then if you sharpen without angling the blade there would be no problem. But if you angle the blade as Sellers does, then you could potentially get an ever-so-slight concave edge – exactly what you don’t want.
It might not ever make a difference in sharpening, but 0.006″ out of flat seems like a lot for a new sharpening plate. If you haven’t used them much yet, I’d contact the seller and ask them to replace them.
I’m pretty sure diamond stones have a break in period. During the plating process the steel plate is crowned. I bet after sharpening with the stone, you will notice it flattening out, because the top layers of diamonds will fracture and come loose. I forget where I read that, but if I can find the link I will reference it.
Diamond plates do indeed ‘wear in’ after some use, which prompts some users to suggest that the cutting action may be reduced as a result, but it’s hardly noticable. After some 5 years use, mine continue to abrade metal quite well time after time.
However, if I read the original question correctly, it concerned a curvature of 0.15 mm over about 150 mm length which is very small…… less than a dog-hair width. It can probably be ignored.
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