I ordered this tool and it's my first time using it,
so any help appreciated
I work metric and with mm/min g-code
Goal:
To thread a 1.3mm deep M3x0.5 hole in extruded aluminum (probably 6061) using this tool without breaking it.
Tool:
Single form thread milling cutter for M3x0.5
*listed specs are in inches
- Thread size: 3
- D1: .0717
- Neck diameter: .040
- L3: 5/32
- Flutes: 2
- D2: 1/8
- L1: 1-1/2
Information from tool manufacturer:
"start with 15,000 RPM and a chip load of .0004 per flute. Using these parameters, there is a calculated linear feed of 12 IPM. To get a circular feed rate, you will need to scale back the linear feed. Circular Feed = linear feed * (major diameter of hole – cutter diameter)/ major diameter of hole"
So...
major diameter of hole: 3mm or maybe 2.5mm..
cuter diameter: 1.82mm
( 2.72x25.4 =69.088mm/Min -- feed: ~F70.0 )
I tried using an online feed/speed milling calculator with .0004 (0.0106mm) chip load per flute but the feed rate was crazy fast, so I just didn't use this info.
G-code:
i found this...
from carmex.com
"
Thread Milling CNC Program for Internal Threading
Program is based on tool center.
This method of programming needs no tool radius
compensation value other than an offset for wear.
Right hand thread (climb milling) from bottom up.
I filled in the fields accordingly.
G90 G00 G54 G43 H1X0 Y0 Z1.0 S15000
G00 Z-1.3
G01 G91 G41X0.295 Y-0.295 Z0 F70.0 D1
G03 X0.295 Y0.295 R0.295 Z0.0625
G03 X0 Y0 I-0.59 J0 Z0.5
G03 X-0.295 Y0.295 R0.295 Z0.0625
G01 G40 X-0.295 Y-0.295 Z0
G90 G0 X0 Y0 Z0
What is this code doing, and what am I missing in order to complete my goal?
Thanks,