How to Troubleshoot Common Issues with Sheet Roll Forming Machines

Even the best sheet roll forming machine can run into production problems. Material waste, dimensional inaccuracies, and unexpected stops cost time and money.

The good news? Most common issues can be diagnosed and fixed without a service engineer.

Below is a practical guide on how to troubleshoot common issues with sheet roll forming machines — keeping your line running smoothly and your reject rate low.

1. Twisted or Spiraled Profiles

Symptoms: The finished sheet or profile rotates along its length. When laid flat, one end lifts off the ground.

Root cause: Uneven roller pressure or misaligned shafts across the roll forming machine stations.

Troubleshooting steps:

• Check that all top and bottom rollers are parallel.

• Verify each stand’s horizontal and vertical alignment.

• Loosen and re-tighten the roller shafts in sequence from entry to exit.

• Reduce pressure on the side where twisting occurs.

Prevention: Always level the sheet roll forming machine base and use a laser alignment tool during setup.

2. Camber (Curved Profile in Horizontal Plane)

Symptoms: The formed profile curves to the left or right when viewed from above — even though the raw coil is straight.

Root cause: One side of the roll forming line has more friction or pressure than the other.

Troubleshooting steps:

• Inspect roller gaps on both sides of each station.

• Check for worn bearings on one side only.

• Ensure the uncoiler and entry guide are centered.

• Add side guides before the first forming station.

Pro tip: Camber often starts at the first 2–3 stations. Correct it early in the sheet roll forming process.

3. Surface Marks, Scratches, or Roller Marks

Symptoms: Visible lines, dents, or scratches along the length of the sheet or profile.

Root cause: Debris on rollers, hardened dirt, or incorrect roller material for your coil type (e.g., galvanized vs. pre-painted).

Troubleshooting steps:

• Stop the roll forming machine and clean all rollers with a soft cloth and solvent.

• Inspect for nicks, burrs, or weld spatter on roller surfaces.

• For painted or coated material, switch to polyurethane or chrome-plated rollers.

• Apply a light film of approved lubricant (check with your coil supplier).

Note: Even microscopic debris on a sheet roll forming line can ruin thousands of feet of material.

4. Inconsistent Length or Poor Cut Quality

Symptoms: Cut lengths vary beyond tolerance (±1.5mm or more). Cut ends have burrs, angled edges, or deformed tube openings.

Root cause: The flying cut-off or hydraulic shear is not synchronized with the roll forming machine’s speed, or blades are dull.

Troubleshooting steps:

• Recalibrate the encoder or length sensor.

• Check for slippage between the measuring wheel and material.

• Sharpen or replace shear blades (typical after 500,000 cuts).

• Ensure the cutoff unit is square to the forming line.

Quick test: Run the sheet roll former at 50% speed. If cutting improves, your PLC or servo tuning needs adjustment.

5. Fluctuating or Overloaded Motor Current

Symptoms: The main drive motor amperage spikes unexpectedly, or the machine struggles to pull the strip.

Root cause: Excessive roller pressure, jammed material, or insufficient lubrication between stations.

Troubleshooting steps:

• Loosen all roller gaps by 0.1–0.2mm and re-tune progressively.

• Verify that the coil strip is not snagging on the uncoiler or entry guide.

• Check gearboxes for low oil or bearing failure.

• Measure material width — an oversized coil will overload any roll forming equipment.

⚠️ Safety warning: Never bypass the motor overload relay. It protects both the operator and the machine.

6. Wavy Edges or Oil Canning

Symptoms: The finished sheet has ripples along the edges or a loose, drum-like center section.

Root cause: Too much material between roller stations (compression) or insufficient forming at critical passes.

Troubleshooting steps:

• Reduce roller pressure at the first 20% of stations.

• Add or adjust pre-forming rollers at the entry section.

• Check the strip width — if too wide for the sheet roll forming machine, trim it first.

• Increase tension between the uncoiler and the forming line.

Expert advice: Wavy edges rarely fix themselves. You may need to reprofile the roller set or consult the original tooling designer.

7. Unusual Noises (Grinding, Clicking, or Squealing)

Symptoms: Your roll forming machine sounds different than last week.

Root cause: Worn bearings, loose keys, or misaligned universal joints.

Troubleshooting steps:

• Listen near each stand with a mechanic’s stethoscope or long screwdriver.

• Stop the machine and rotate each roller by hand.

• Replace any bearing that feels gritty or has radial play.

• Tighten all shaft keyways and coupling bolts.

Golden rule: Never ignore new noises. Most catastrophic roll forming machine failures started as a small, ignored sound.

Preventive Maintenance Checklist (To Avoid Most Issues)

Final Thoughts

Knowing how to troubleshoot common issues with sheet roll forming machines turns costly downtime into a 15–30 minute fix. Start with the simplest cause (dirty rollers, loose bolts, material width) before assuming major tooling damage.

Bookmark this guide for your next production stoppage — and share it with your machine operators.

Need replacement parts or technical support for your sheet roll forming machine?
Contact our team with your machine model number and issue description. We offer same-day troubleshooting support and fast spare parts shipping.

FAQ

What are the most common problems with roll forming machines?

Some problems happen a lot with these machines. Roller misalignment is one of them. Lubrication failures also cause trouble. Electrical faults can stop the machine. Coil entry errors are another problem. These issues can slow work and make products worse.

How often should you perform maintenance on your sheet roll forming machine?

Check your machine every week. Clean the rollers and check oil levels. Look for any signs of wear. Once a month, test the electrical systems. Calibrate the sensors monthly too. Use a checklist to remember each job.

Why does your machine produce wrinkled or twisted sheets?

Wrinkled or twisted sheets mean rollers are not lined up. Check if the rollers are straight. Look at the entry guides too. Adjust the rollers so they match the centerline. Change any rollers that look worn out.

What should you do if your machine stops suddenly?

Start by checking the power supply. Look at all the wires for loose spots. Check the control panel for fault codes. If you still cannot find the problem, call a BMS Machinery expert.

How can you prevent surface scratches on finished sheets?

Clean the rollers and guides before each shift. Take off any debris from the sheet metal. Use the right lubrication every time. Check rollers for damage often. Change any worn parts to keep sheets smooth.

When should you consult a professional for troubleshooting?

Call a professional if you see alarms or error codes often. Strange machine actions mean you need help. If basic checks do not fix it, ask BMS Machinery experts for help.

What records should you keep for maintenance?

Write down every maintenance job you do. Record inspections, repairs, and parts you change. Keep reports for electrical, mechanical, and coil handling work. Use digital records so you can find them fast.