The rake angle of the twist drill lip is ______Question 20Select one:positivepositive near marginpositive near drill centernegativeconstant

The range of the helix angle of the twist drill is ________Question 5Select one:a.> 0 and < 90b.0-180c.> 90 and < 180d.> 180e.90-180

The range of the helix angle of the twist drill is

2-lips twist drill having a diameter of 4 [mm] and point angle 117 rotates at 691 [RPM] and feeds towards the work part at a rate of 0.38 [mm/rev], to drill a through hole of 34 depth. Machining allowance is 4 [mm]. Ignore length of chesil. MRR in [mm3/min] is then given by:Question 21Answer3869.953703.311934.987739.917739.91

A 1-lips twist drill having a diameter of 7 [mm] and point angle 118 rotates at 617 [RPM] and feeds towards the work part at a rate of 58 [mm/min], to drill a blind hole of 37 depth. Machining allowance is 3 [mm]. Machining time is then given by:

The drill diameter is measured at _________Question 11Select one:a.drill pointb.chesil edgec.margind.necke.heel