Wave skiving

[cocuzza]

Hello everyone, I recently bought my first skiving machine, it's a used machine, a Sagitta SC75A (for which I'm also looking for the manual) I'm new to skiving so I'm asking you if you've encountered problems like mine and could you explain to me how I can solve them? The big problem is that it flakes unevenly with a wavy pattern, not smooth as it should be. Thank you Ps, I'm attaching a photo to help you understand the problem. It's a 2cm wide and very long strip of leather, stripped from 1mm to 0.5mm.

[TomE]

I'm no expert but I would sharpen the knife, working slowly/gradually to avoid overheating.  Use a marker on the bevel to see that the stone is creating a uniform bevel.  I would also polish the foot to reduce drag - use a buffing wheel if you have access to one.  Check that the drive roller is round and without gouges/flat spots by shining a bright light to visualize the gap between the roller and the knife.