G83 is a G-code command that instructs a CNC machine to perform a peck drilling operation. Peck drilling is a technique of drilling deep holes in metal or wood by retracting the drill bit partially or completely out of the hole after each cutting cycle. This helps to clear the chips, reduce heat, and prevent the drill bit from breaking or jamming.
Usage format
The general format of the G83 command is:
G83 X Y Z R Q F
where:
- X and Y are the coordinates of the center of the hole
- Z is the depth of the hole (negative value)
- R is the position of the retract plane (positive value)
- Q is the depth of each peck (positive value)
- F is the feed rate of the drill bit
Explanation
The G83 command works as follows:
- The drill bit moves to the X and Y coordinates at the rapid traverse rate
- The drill bit moves down to the R position at the rapid traverse rate
- The drill bit moves down by Q amount at the feed rate F
- The drill bit retracts to the R position at the rapid traverse rate
- The drill bit repeats steps 3 and 4 until the Z depth is reached
- The drill bit retracts to the initial position at the rapid traverse rate
Example
Here is an example of a G83 command:
G83 X10 Y20 Z-50 R5 Q10 F100
This command will drill a hole with the following parameters:
- Center of the hole: X10 Y20
- Depth of the hole: 50 mm
- Retract plane: 5 mm above the hole
- Peck depth: 10 mm
- Feed rate: 100 mm/min
The text diagram of the peck drilling operation is shown below:
|<--X-->|
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| |<--Y
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| |<--R
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| |<--Q
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| |<--Z
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|_______|