Spotting Drill

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Need help with CNC codes?

Im a student in the machining industry and i need some help. I need the G codes for spot drill, drill, and a tap. i also have no clue how to write a code for a contour. i know i am supposed to use G2 but i do not know how to write it out in a cnc code format.

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( G codes for spot drill, drill, and a tap )
( cnc program )
( OFFSET SET X0 AND Y0 AT CENTER OF PART )
( MY OFFSET IS G54)
( TOUCH OFF TOOLS ON TOP OF THE PART)
( CENTER DRILL T1 )
( DRILL T2 )
( 1/4-20 TAP T3 )
( 45 DEG CHAM TOOL T4 )
M1
T1M6( CENTER DRILL T1 )
G90G40G80G17G94
G54G0Y0X02M3S2000
G43H1Z1.M8
G81Z-2.22R.1F4.
G80
M9
G0Z2.
Z5.
M1
T2M6( DRILL T2 )
G90G40G80G17G94
G54G0X02Y0M3S1200
G43H2Z1.M8
G83Z-.5R.1F5.Q0.025
G80
M9
G0Z2.
M1
T3M6( 1/4-20 TAP T3 )
G90G40G80G17G95
G54X0Y0S200M5
G43H3Z1.M8
M29S200
G84R0.5Z-0.625F.050
G80
M9
G94
G0Z2.
M1
T4M6( 45 DEG CHAM TOOL T4 )
G90G40G80G17G94
G54X0Y0M3S2000
G43H4Z1.
Z0.1M8
G1Z-.025F10.
G41X.05F50.
G3I-.05
XO.
G0Z1.
Z2.
G40
M9
M1
G91G28Z0
G90G53X-32.Y0.
T1M6
M30
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on some cnc machines for taping you need to
calculate the pitch of the thread

this how u do it

if it a 1/4-20 tap 1/20=.05 (.05 is your pitch)

pitch * rpms = feed

so that means .05 * 200 rpms = feed of 10.

so that means your rpms will be S200 and feed is F10.

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A Type 10mm HSS Combined Center Drill 60 Degree Angle Spotting Countersink Bit
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A Type 15mm HSS Combined Center Drill 60 Degree Angle Spotting Countersink Bit
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A Type 20mm HSS Combined Center Drill 60 Degree Angle Spotting Countersink Bit
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A Type 25mm HSS Combined Center Drill 60 Degree Angle Spotting Countersink Bit
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A Type 30mm HSS Combined Center Drill 60 Degree Angle Spotting Countersink Bit
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A Type 35mm HSS Combined Center Drill 60 Degree Angle Spotting Countersink Bit
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A Type 50mm HSS Combined Center Drill 60 Degree Angle Spotting Countersink Bit
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