G73 / G83 Peck Drilling Reposition Location - Mach4

Symptoms

  • The control descends too far on a rapid reposition and breaks drill bits.
  • High-speed peck drilling needs a different retract distance than the system default.

Solution

Mach4 has two pound variables that affect the reposition behavior with regards to peck drilling.

SV_HSP_CLEARANCE / #5114

High Speed Peck drilling cycle (G73) rapid retract clearance.
(integer specifying .0001" or .001mm increments, depending on machine units)

This parameter is how far above the bottom of each peck to command a rapid movement to before descending for the next peck.

If you specify 0 for this parameter, Mach4 uses the internal default value of 250 (imperial) or 600 (metric). 

g73-100.png

G code Examples

Machine units are inches

#5114 = 250 (0.0250")

G73 X0 Y0 Z-2 R.5 Q.5 F20

Machine units are millimeters

#5114 = 600 (0.60mm)

G73 X0 Y0 Z-50.8 R12.7 Q12.7 F500

SV_FRP_CLEARANCE / #5115

Full Retract Peck drilling cycle (G73, G83) rapid clearance before feed starts.
(integer specifying .0001" or .001mm increments, depending on machine machine units)

This parameter is how far above the bottom of the (previous peck) to command a rapid movement to before starting feed rate moves descending for the next peck.

If you specify 0 for this parameter, Mach4 will use the internal default of 100 (imperial) or 250 (metric).

g73-750.png

For the G83 Full Retract Peck Drilling cycle, the behavior is the same, except every rapid retract goes to the retract plane (R parameter). The HSP parameter does not affect G83 behavior.

g83-peck-drilling.png

G code Examples

Machine units are inches

#5115 = 100 (0.01")

G83 X0 Y0 Z-2 R.5 Q.5 F20

#5115 = 100 (0.01")

G73 X0 Y0 Z-2 R.5 Q.5 F20

Machine units are millimeters

#5115 = 250 (0.25mm)

G83 X0 Y0 Z-50.8 R12.7 Q12.7 F500 

#5115 = 100 (0.01")

G73 X0 Y0 Z-50.8 R12.7 Q12.7 F500

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