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13. Program Support Functions
13.1 Fixed Cycles
276
13.1.2 Drilling Cycle with High-Speed Retract
Function And Purpose
This function retracts the drill from the hole bottom at high speed in drilling machining. This
function helps extending the drill life by reducing the time of drilling in vain at hole bottom.
Hole bottom
Moves up at high-speed
Returns in
rapid traverse
The drill moves up at high-speed and returns to
initial point or R point in rapid traverse
<When Axis prefiltering is enabled>
Command Format
Same as the fixed cycle command format.
Detailed Description
(1) This function is available only when “#8123 H-spd retract ON” is enabled in the following fixed
cycles.
G81 (Drill spot drilling cycle)
G83 (Deep whole drilling cycle)
G73 (Step cycle)
(2) When “#8123 H-spd retract ON” is ON, the axis is retracted from the hole bottom at high speed
with lost motion compensation.
(a) Set the lost motion compensation type 2 or 3 with servo parameter. Then set the following
parameters to adjust the retract amount.
#2170 Lmc1QR (Lost motion compensation gain 1 for high-speed retract)
(equivalent to "#2216 SV016 LMC1 Lost motion compensation 1")
#2171 Lmc2QR (Lost motion compensation gain 2 for high-speed retract)
(equivalent to "#2241 SV041 LMC2 Lost motion compensation 2")
(b) Set the following parameters for lost motion compensation timing or lost motion
compensation 3 spring constant/ viscous coefficient in addition to the ordinary lost motion
compensations.
#2172 LmcdQR (Lost motion compensation timing for high-speed retract)
(equivalent to "#2239 SV039 LMCD Lost motion compensation timing")
#2173 LmckQR (Lost motion compensation 3 spring constant for high-speed retract)
(equivalent to "#2285 SV085 LMCk Lost motion compensation 3 spring constant")
#2174 LmccQR (Lost motion compensation 3 viscous coefficient for high-speed retract)
(equivalent to "#2286 SV086 LMCc Lost motion compensation 3 viscous coefficient")