Mr . CNC

22/10/2025

Tangential cutting force, Ft
• Forces the tool down, away from the
center line
• Gives a reduced clearance angle.
Radial cutting force, Fr
• Alters cutting depth and chip thickness
• Gives out of tolerance dimension and
risk of vibration.
Feed force, Fa
• Directed along the feed of the tool.

22/10/2025

You must understand what axial and radial forces mean in turning.
1. Axial Force (Ff)
This force acts along the axis of the workpiece (toward the chuck).
It’s represented by the horizontal red arrow in the image and affects the feed direction.

2. Radial Force (Fp)
This force acts perpendicular to the workpiece axis (side direction).
It’s shown as the vertical red arrow and tends to push the tool away from the workpiece.

19/10/2025

Feed → is the distance the tool advances per revolution of the spindle (in turning) or per tooth (in milling).

Feed Rate → is the actual linear speed of the tool movement along the workpiece, usually in mm/min.
It's calculated by multiplying the feed per
revolution by the spindle speed

17/10/2025

G-code G41

The importance of G41 and G42 tool radius compensation on tapered and curved surfaces.

16/10/2025

ازاي احسب عدد المشاوير؟

How do I calculate the number of passes?

16/10/2025

Is there anything else that hasn't been added?
O0002 (TURNING G2/G3 WITH R1)
N1 G18 G90 G71
N5 G28 U0 W0
N10 T0101 (ROUGHING TOOL LEFT)
N11 G92 S3500
N15 G96 S150 G95 F0.1 M4 M8
N20 G0 X32 Z0
N25 G1 X-1 (FACING)
N30 G0 Z2
N35 G28 U0 W0

N40 T0202 (CENTER DRILL)
N45 G97 S2000 G95 F0.07 M3 M8
N50 G0 X0 Z2
N55 G1 Z-4
N60 G0 Z2
N65 G28 U0 W0

N70 M00 (ADJUST TAILSTOCK)

N75 T0101 (ROUGHING TOOL LEFT)
N80 G96 S150 G95 F0.15 M4 M8
N85 G0 Z1
N90 X28.4
N95 G1 Z-74.9
N100 X31
N105 G0 Z1
N110 X26.4
N115 G1 Z-49.9
N120 X30
N125 G0 Z1
N130 X24.4
N135 G1 Z-24.9
N140 X30
N145 G0 Z1
N146 G28 U0 W0

N147 T0303 (COPYING TOOL LEFT)
N148 G96 S250 G95 F0.1 M4 M8

N150 G42 G0 X22 Z1
N155 G1 Z0
N160 G3 X24 Z-1 R1
N165 G1 Z-25
N170 G3 X26 Z-26 R1
N175 G1 Z-50
N180 G3 X28 Z-51 R1
N185 G1 Z-75
N190 X31
N195 G40
N200 G0 X60 Z100 (SAFE RETRACT)
N205 G28 U0 W0 M5 M9
N210 M30

Save this post, you’ll definitely need this turning program one day!

What do you think about this program? Is everything correct or do you see anything that needs to be fixed?

O0002 (TURNING G2/G3 WITH R1)
N1 G18 G90 G71
N5 G28 U0 W0
N10 T0101 (ROUGHING TOOL LEFT)
N11 G92 S3500
N15 G96 S150 G95 F0.1 M4 M8
N20 G0 X32 Z0
N25 G1 X-1 (FACING)
N30 G0 Z2
N35 G28 U0 W0

N40 T0202 (CENTER DRILL)
N45 G97 S2000 G95 F0.07 M3 M8
N50 G0 X0 Z2
N55 G1 Z-4
N60 G0 Z2
N65 G28 U0 W0

N70 M00 (ADJUST TAILSTOCK)

N75 T0101 (ROUGHING TOOL LEFT)
N80 G96 S150 G95 F0.15 M4 M8
N85 G0 Z1
N90 X28.4
N95 G1 Z-74.9
N100 X31
N105 G0 Z1
N110 X26.4
N115 G1 Z-49.9
N120 X30
N125 G0 Z1
N130 X24.4
N135 G1 Z-24.9
N140 X30
N145 G0 Z1
N146 G28 U0 W0

N147 T0303 (COPYING TOOL LEFT)
N148 G96 S250 G95 F0.1 M4 M8

N150 G42 G0 X22 Z1
N155 G1 Z0
N160 G3 X24 Z-1 R1
N165 G1 Z-25
N170 G3 X26 Z-26 R1
N175 G1 Z-50
N180 G3 X28 Z-51 R1
N185 G1 Z-75
N190 X31
N195 G40
N200 G0 X60 Z100 (SAFE RETRACT)
N205 G28 U0 W0 M5 M9
N210 M30

15/10/2025

Siemens NXCAM 2D profile

15/10/2025

The more slender the bar, the smaller the force required to make it buckle.

Buckling of Slender Bars

Buckling occurs when a long and slender bar under compressive load suddenly bends sideways instead of shortening further.
When the critical compressive stress is reached, the bar moves from a straight (unstable) shape to a bent (stable) one.

This phenomenon appears in spindles, gear supports, and frame members.
In the elastic (Euler) range, the critical buckling load can be calculated by Euler’s formula:

14/10/2025

N50 G71 U W R
N55 G71 P Q U W F

U Depth of cut in X (incremental value)
W Depth of cut in Z (incremental value)
R Retract amount (how much the tool lifts between passes)
P Start block number of contour
Q End block number of contour
U (2nd line) Finishing allowance on X
W (2nd line) Finishing allowance on Z
F Feed rate

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14/10/2025

Where is the support, my friends? 🥹

Code for dwell during drilling?

14/10/2025

We need the 90K legends from Mr.CNC to follow Mr.CNC2 too! 😂
I know it’s a cheeky ask, but come on — just this once!

Let’s continue the code
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14/10/2025

What is block N1235?