►changing hss twist drill bit, how to ensure that a second drill hole as the same with first drill hole in depth

Specific steps

1, grinding repair hss drill bit 

2, h values ​​measured by the projector cutting portion of the drill

h = distance between the cutting point of the drill to the top

3, find the reference point (how to do)

3.1 gauge

3.2 calls cylindrical knife (TXXXX)

3.3 car end face of the workpiece (Z0.0)

3.4 Cylindrical knife back to a safe point (G28U0.0)

4, calculate hole depth = h + work site (directive simply change the value of h, and the hole depth setting unchanged)

5 illustrates (BO18C drilling program)

T1313

# 100 = h

G0G99Z-3.0

X0.0

Z-1.0

[Actual depth h + holes] G83Z Q2000F0.06

G80

G0X38.

M1%

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