hello all, can anyone help me here?
i had problem with drilling condition...
my workpiece is 31,5 thick, and i need to drilling a 330 holes with 1 mm drill for 6 mm in depth.
the drilling starting at 24,5 mm depth (the workpiece is step in geometry)
im using 4900 rpm in spindle speed and 47 mm/m in plunge rate.
overall lenght for the tool are 41mm and the flute lenght are 22 mm.
the safety clearence of the tool are 35mm. im using the peck drill method for 0,25 mm in depth for every hole.
when i'm starting to drill, the drill are vibrate (of course i'm using centre drill for start).
can any one help me with the problem for the rite drilling condition?
note: im using white hss drill (straight shank) from nachi and its the only tool that available in here... and im attach the file for drilling
thanks for the help....