Hello,
I'm trying to do a I assumed simple internal profiling, initial hole is 12.75mm (0.50197")(taped to M14 x 1.25 latter) by 50 mm long and I'm profiling two 15 mm diameter recess, one from Z-42.5mm (-1.67323 ") to Z-26.5mm (-1.04331") and a the other from Z-17mm (-0.66929") to Z0mm in low carbon steel (should be easy right ?)
I'm using a Horn Mini boring bar (carbide shank) reference B111.0012.03 it's the 56mm (2.20472") reach one with internal coolant with a 8mm diameter (0.31496") held in a VDI30 16 mm E2S holder (the kind that clamps the tool via a split not via set screw so in theory less vibration) on a HAAS SL10 and the insert is a R111.0200.02 TN35 (internal profiling coated)
Horn has (IMO) poor documentation when it come to feeds and speeds they mention 241m/min cutting speed (790 sfm) and a feed going from 0.05mm/T to 0.01mm/T (0.00197"/T to 0.00039"/T) for very rigid to not rigid setup.
I started out with a 150m/min cutting speed (492sfm) with a 0.01 mm/T feed (0.00197"/T) and it chattered at a high pitch and consequently I got insert chipping... changed the insert (15 euros.. grrr) and went with 75 m/min cutting speed (246sfm) with the same feed and it made absolutely no difference !
Could this be more of a centerline issue ?
I can try t slightly rotate the tool holder in the E2S holder so as to lower or raise the tool tip position in relation to the centerline, but for a ID I should raise it rather than lower it ?
I'm trying to do a I assumed simple internal profiling, initial hole is 12.75mm (0.50197")(taped to M14 x 1.25 latter) by 50 mm long and I'm profiling two 15 mm diameter recess, one from Z-42.5mm (-1.67323 ") to Z-26.5mm (-1.04331") and a the other from Z-17mm (-0.66929") to Z0mm in low carbon steel (should be easy right ?)
I'm using a Horn Mini boring bar (carbide shank) reference B111.0012.03 it's the 56mm (2.20472") reach one with internal coolant with a 8mm diameter (0.31496") held in a VDI30 16 mm E2S holder (the kind that clamps the tool via a split not via set screw so in theory less vibration) on a HAAS SL10 and the insert is a R111.0200.02 TN35 (internal profiling coated)
Horn has (IMO) poor documentation when it come to feeds and speeds they mention 241m/min cutting speed (790 sfm) and a feed going from 0.05mm/T to 0.01mm/T (0.00197"/T to 0.00039"/T) for very rigid to not rigid setup.
I started out with a 150m/min cutting speed (492sfm) with a 0.01 mm/T feed (0.00197"/T) and it chattered at a high pitch and consequently I got insert chipping... changed the insert (15 euros.. grrr) and went with 75 m/min cutting speed (246sfm) with the same feed and it made absolutely no difference !
Could this be more of a centerline issue ?
I can try t slightly rotate the tool holder in the E2S holder so as to lower or raise the tool tip position in relation to the centerline, but for a ID I should raise it rather than lower it ?