07-10-2012, 05:27 AM
Hello All,
As I understand that last statement, the strange marks were on the end of the piece that was at the start of the cutting stroke, if so, the marks could indicate a number of things, I would look for clearance in the clapper mechanism, or maybe the cross rail slide, as the cut is evening out once the cut reaches "Equilibrium" that is after the forces of tool entry settle out and the associated vibration is damped the finish is actually pretty good, another factor that can cause this is too thick an oil film, which settles out after some cutting force is applied too thick a film isn't as a result of too much oil but rather too viscous an oil, thick oil can create a very thick oil films on slides with large bearing surfaces which will be pushed out of the way under loads.
Simply changing the tool angles and nose radius can work wonders in this area.
Best Regards
Rick
As I understand that last statement, the strange marks were on the end of the piece that was at the start of the cutting stroke, if so, the marks could indicate a number of things, I would look for clearance in the clapper mechanism, or maybe the cross rail slide, as the cut is evening out once the cut reaches "Equilibrium" that is after the forces of tool entry settle out and the associated vibration is damped the finish is actually pretty good, another factor that can cause this is too thick an oil film, which settles out after some cutting force is applied too thick a film isn't as a result of too much oil but rather too viscous an oil, thick oil can create a very thick oil films on slides with large bearing surfaces which will be pushed out of the way under loads.
Simply changing the tool angles and nose radius can work wonders in this area.
Best Regards
Rick
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