SO DAK4442 you are right... the cause is Edge drag . the marks are caused by the lowest edge of the graver bumping/cutting into the outer edge of the cut. I believe lowering the graver is the primary reason for this occurance but alsoa twisting motion could play a part.
when cutting at a depth that I percieve to be normal for me and my script cuts this has been occuring . What works for me is ,if you raise your heel angle from 10 - 20 . too more like 20/25 - 40 that you will eliminate this edge drag because your graver will be higher and inturn the lowest edge that was previously contacting will be higher.I can cut with a 10/20 heel but only until i want to exit the cut and i raise the cutting edge upwards and ultimately the lowest edge downwards and into the metal which leaves the edge drag marks. your graver is higher when entering ., then lowers to the normal cutting depth then lowers again when leaving , a scooping motion is required so i had to higher the angle . an alternative maybe to grind away this edge but not near the point and only by a 1mm at a guess.
monk i see what your saying . and chujy im now certain its ( dropping )
Just thought i share my findings from these past stresful angry confused days.
Thank you for all your wisdom
Indy
Bump master Bluetick strikes again!! I have been experimenting with different graver geometries (even trying what I think is a close facsimile of a Speitzer) but no matter what I whip up, they all suffer from varying degrees of heel drag. The only way to avoid it is to make such shallow cuts they have no sparkle or character at all... If there is any depth of cut.... Heel drag. I have tried raising my AOA, lowering it, nothing seems to result in what I would call a nice cut. Rolling into the cut, rolling out, no joy. I get that I'm only two weeks in here so I'm not discouraged in the least but reading this thread has given me some ideas to try tomorrow (I've been at it all day, wife says time for a break!!) and I thought it might help some of my fellow noobs who may be suffering the same plague.