CNC Pipe Bending Machine

Last updated on 11 Aug 2025

CNC Pipe Bending Manual

Safety Precautions :-

1. Wear gloves, safety shoes, and glasses.

2. Always press Emergency Stop before loading/unloading.

3. Pipe length Max. 2000 mm, Pipe diameter 32 mm.

4. Maintain a safe distance from the machine during bending operation to avoid injury from moving parts or sudden springback of the pipe.

5. Never place hands near the bending die or clamp while the cycle is running.

6. Double check readings before starting.

7. In JOG mode, select the correct Axis.

8. Avoid standing in the direct path of the bending arm or pipe end during operation.

1. Objective - To perform accurate pipe bending at any specified angle and position by calculating the correct X-feed length, setting up the CNC pipe bending machine properly, and following standard operating and safety procedures.

2. Applications :-

Pipe bending is widely used in various industries for manufacturing and assembly purposes.

Some common applications include:

Automobile Industry – Exhaust systems, roll cages, chassis frames, brake & fuel lines.

Furniture Manufacturing – Chairs, tables, racks, and decorative frames.

Construction & Infrastructure – Handrails, guardrails, pipelines for water and gas.

Industrial Machinery – Conveyors, protective frames, and piping for automation systems.

3. Example Case

Task: Perform a 90° bend on a pipe at a specific marking position.

Pipe Length: 2000 mm

Pipe OD: 32 mm

CLR: 200 mm

Bend Angle: 90°

Bend Center Position: 500 mm from one end

4. Steps to Follow

Step 1 – Machine Startup

1. Turn ON MCB.

2. Turn ON control panel & press Green NC Button.

3. Release Emergency Stop Button if pressed.

4. Press Control Button to enter Ready Mode.

Step 2 – Pipe Measurement & Marking

1. Measure the total pipe length using a measuring tape.

2. Mark the location where the bend center is required (e.g., 500 mm from one end).

3. Ensure the marking is clear and visible for alignment during loading.

Note - During Step 6 (Job Loading), ensure the marking is aligned exactly with the die center to achieve the required bend position.

Step 3 – Calculate X-Feed Length for 90 degree bend

1. Bend Allowance (BA)

(CLR - Center Line Radius)

BA = (3.14 x 90 x 200/180) = 314 mm {CLR =200}, {Angle = 90°}

2. Offset:

Offset = BA/2 = 157 mm

X = 500 - 157 = 343 mm

Step 4– How to create New Program

Step 5– Program Creation

Example program for this case:

G01 X343.0 F3000 ; (G01 - linear interpolation)

G01 B104 (B90) F500 ; (B90 - Desired Angle, B104 -Input Angle)

G04 X5.0 ; (G04 -Dwell Command / Wait Time)

G01 B0 F500 ;

M01 ; (Pause for Job Unload)

G01 X0 F3000 ;

M30 ; (Program End)

Note: Before creating or editing programs, ensure you have a basic understanding of G-code and M-code functions, as these control the machine’s movements and operations.