How to Cut Perfect Circles with a Plasma Cutter: Complete Guide
How to Cut Perfect Circles with a Plasma Cutter: Complete Guide
Cutting perfect circles with a plasma cutter is one of the most common tasks in metal fabrication. Whether you are cutting flanges, access holes, or decorative metal pieces, a clean round cut saves hours of grinding and finishing work. In this guide, we will cover everything you need to know about plasma circle cutting.
A plasma circle cutting compass is the most reliable tool for achieving drift-free round cuts. Unlike freehand cutting, a compass attachment guides the torch in a perfect arc around a center pivot point. The result is a clean, burr-free edge with zero oval distortion.
The WeldingStop Heavy-Duty Plasma Circle Cutting Compass features a neodymium magnetic base with six strong magnets, a low-friction guide wheel, and an adjustable diameter range from 10 cm to 100 cm, making it suitable for most circular cutting applications.
Prepare Your Workpiece
Ensure the steel surface is clean and free of rust, paint, or oil. The magnetic base requires direct contact with bare ferromagnetic metal for maximum holding force.
Set the Cutting Diameter
Measure and mark the center point of your desired circle. Adjust the compass arm to the required radius using the printed metric scale. Lock the arm in place with the lock buckle.
Attach the Magnetic Base
Position the center magnet directly over your marked center point. The six neodymium magnets will lock the compass firmly onto the steel surface. For vertical or overhead work, press firmly to ensure full magnetic contact.
Mount the Torch
Attach your AG-60 or SG-55 plasma torch to the compass guide. Adjust the roller wheel height to maintain a consistent standoff distance from the workpiece.
Cut the Circle
Start your plasma cutter and begin cutting along the guided path. Move smoothly at a steady speed, letting the compass guide wheel follow the arc. The low-friction pivot ensures smooth rotation with minimal effort.
- Always use sharp/new consumables (electrode, nozzle) for cleaner cuts.
- Maintain a consistent travel speed - too fast causes drag marks, too slow creates excessive kerf.
- For thicker materials (above 1/2 inch), make multiple passes rather than forcing one deep cut.
- Clean the magnetic base surface regularly to maintain maximum holding force.
- Practice on scrap metal first to dial in your speed and standoff distance.
Ready to Cut Perfect Circles?
Get the WeldingStop Heavy-Duty Plasma Circle Cutting Compass today and achieve professional results every time.
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