Flying Shear Setup: Why It’s the Hardest Part of Installation

The most complex, misunderstood, and downtime-causing part of any roll forming machine.

The flying shear is one of the most critical components on a roll forming line. It is responsible for cutting material at full production speed, synchronised perfectly with machine movement.
If the flying shear is not set up correctly, nothing else will run smoothly — not the cut lengths, not the production speed, and not the scrap rate.

This is why flying shear setup is the hardest and most precise part of machine installation, requiring expert calibration, timing, encoder integration, hydraulic tuning, and PLC logic alignment.

Below is a complete breakdown of why this process is so challenging — and why properly setting it up determines the performance of the entire machine.

1. The Flying Shear Must Move and Cut at the Same Speed as the Strip

Unlike a stop-cut shear, a flying shear must:

• Detect the correct cut position

• Accelerate to match line speed

• Clamp the strip

• Cut cleanly

• Decelerate

• Return to home position

All of this happens in milliseconds.

If the synchronization is off by even 1–2%, the machine will:

• Cut short

• Cut long

• Fail to clamp properly

• Damage tooling

• Shake violently

• Cause mechanical backlash

• Create inconsistent sheet lengths

Flying shears demand extreme timing accuracy.

2. Encoder Communication Must Be Perfect

Flying shears rely entirely on the encoder for position and speed data.

If the encoder setup is wrong, you’ll see:

• Jumping cut lengths

• Random overcuts and undercuts

• Shear firing too early or too late

• Punch and shear drift

• Inability to speed up the machine

Setup requires:

✔ Encoder pulse scaling
✔ Direction verification
✔ Zero-point calibration
✔ Filtering of electrical noise
✔ Pulse stability checks

This is where most installation teams fail.

3. VFD or Servo Tuning Is Extremely Sensitive

The flying shear motor (servo or VFD-driven) must be tuned for:

• Acceleration

• Deceleration

• Torque curve

• Brake ramp

• Following error

• Overshoot and undershoot

• Load changes under hydraulic resistance

If this tuning is off:

• Shear overshoots its position

• Shear “lags” behind the profile

• Servo faults appear

• Machine stops frequently

• Mechanical wear increases

Proper tuning requires a technician who specialises in servo/VFD motion — not a general electrician.

4. Hydraulic or Pneumatic Clamping Must Be Timed Exactly

For machines using hydraulic clamping:

• Pressure

• Flow

• Valve dwell time

• Cylinder timing

• Oil temperature

• Cut-stroke speed

All affect the cut quality.

If clamping pressure or timing is wrong:

• Material slips during the cut

• Shear blade bends material

• Punch/shear timing drifts

• Blades wear out prematurely

Flying shear cylinders require millisecond-level timing, which takes meticulous setup.

5. PLC Logic Must Be Coordinated with Mechanical Movement

The PLC must synchronise:

• Encoder counts

• Punch timing

• Motor speed

• Servo ramping

• Cut-position logic

• Clamp piston timing

• Shear blade firing

• Return-to-home movement

If any of these signals fire early or late:

• You get bad cuts

• The machine vibrates

• The shear cannot catch up

• The motor faults

• Blades break

Flying shear PLC logic is one of the most complex parts of any roll forming control system.

6. Mechanical Alignment Determines How Smoothly It Travels

Flying shears have:

• Linear rails

• Bearings

• Gearboxes

• Timing belts or chains

• Pulleys

• Pneumatic or hydraulic lines

• Return springs

• Hard stops

If mechanical alignment is off:

• The shear drags or binds

• Motor load increases

• Servo following error appears

• Cut timing becomes unstable

• Noise and vibration increase

This is why flying shears must be aligned with micrometer-level precision.

7. High Production Speed = Very Small Margin for Error

At slow speed (3–4 m/min), many errors go unnoticed.
But at production speeds of 30–60 m/min, even the smallest error becomes catastrophic.

Small errors cause:

• 5–10 mm cut inaccuracies

• Punch misalignment

• VFD faults

• Shear lockups

• Tool damage

• Scrap material

High-speed flying shears operate with almost zero tolerance for error.

8. The Shear Must Return Home in Perfect Time

After cutting, the flying shear must:

• Reverse direction

• Decelerate

• Reset

• Re-accelerate

• Be ready for the next cut

If it returns too late:

• The machine slows down

• Cut spacing becomes inconsistent

• PLC errors occur

If it returns too fast:

• Servo overload

• Gear/pulley stress

• Noisy operation

Return timing is critical — and difficult to get right.

Why Flying Shear Setup Requires Expert Technicians

Flying shear setup requires expertise in:

✔ PLC motion logic
✔ Servo/VFD tuning
✔ Encoder calibration
✔ Hydraulic timing
✔ Mechanical alignment
✔ Electrical noise elimination
✔ Safety interlock logic

Most installation teams can level the stands and align tooling — but very few can properly tune a flying shear.

This is why so many factories experience:

• Unstable cut lengths

• Shear faults

• Noise and vibration

• Excessive scrap

• Slow production speeds

And why Machine Matcher’s flying shear experts are in such high demand globally.

Machine Matcher CTA — Flying Shear Setup & Calibration

Machine Matcher provides complete flying shear setup services:

• Servo/VFD tuning

• Encoder calibration

• Hydraulic timing

• PLC motion logic correction

• Mechanical alignment

• Cut-length accuracy calibration

• High-speed performance testing

• Full operation report

Get your flying shear set up by specialists — and unlock high-speed, accurate production.

Machine Matcher now offers full electrical technician services for roll forming machines — including diagnostics, rewiring, testing, encoder calibration, PLC programming, electrical audits, and preventive maintenance.
We support all machine types and all global regions.
Contact us today for immediate technical assistance or to schedule a full electrical inspection at your factory.

Looking for the right roll forming machine or expert guidance on your next project? Machine Matcher is here to help. Our global team provides 24/7 technical support, expert advice, and guidance on machine selection, setup, and maintenance—ensuring your operations run smoothly from day one.

With team members based worldwide—including the UK, USA, Middle East, and beyond—we are equipped to assist buyers across the globe. Whether you’re sourcing a single machine or upgrading an entire production line, our experts are ready to provide tailored solutions and support every step of the way.

Get in touch now and let Machine Matcher help you find the perfect roll forming machine for your business.

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