Anyone know what is causing this pattern?
The main diameter is 1.389”. Material is 4130. It is being cut with a 1” Silent Bar out 5” with a DCMT 3(2.5)2 Sandvik insert finishing .005” depth at .005” per rev. and 600sfm.
The main diameter is 1.389”. Material is 4130. It is being cut with a 1” Silent Bar out 5” with a DCMT 3(2.5)2 Sandvik insert finishing .005” depth at .005” per rev. and 600sfm.
1 Like
Probably not enough of a bite (DOC) to cut a chip so it’s essentially rubbing material off as opposed to cutting it. Try leaving more stock for finish… maybe .030/side.
1 Like
Ditto on Depth of Cut check, need .020" or more per side. Also check and make sure there is not BUE (built up edge) on insert tip.
Can you feel this with a straight pin? Can you feel it with your finger nail? If not it is a stress pattern from when the material was rolled at the mill. There are several reasons for residual stress in raw materia. If you are actually seeing this, your cut is very good as you are not deforming the material with cut pressure.
If you can feel this then refer to correct prior answers.
I believe it is the residual stress as it can’t be felt with a straight pin and increasing the finish DOC got rid of it but made maintaining surface finish and tolerance more difficult. Thanks for all the help.