John, I recently got the scissor attachment. So far I’ve only sharpened three pairs of scissors. I used a sharpie and determined the angle that way. I did find the bevel angle on the scissors was not flat and consistent across the thickness of the scissor steel. Thicker scissors that was more evident than thinner steel scissors. I concentrated my sharpening efforts right at the portion of the bevel where the two sides made contact. I did not profile the full thickness of the steel. I left it as it was. Just smoothing and flattening the point where the two sides contacted made a big difference in the sharpness feel of the scissors. I did not really remove any steel, just aligned the sides so they met smoothly.
I don’t think the angle would be helpful to you because scissors are so different form pair to pair and the clamping position is almost impossible to record. Besides the clamping position of the scissors in the adapter you also have a separate clamping position of the adapter in the vice to content with.
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