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Rounding the corners of glass can enhance safety, appearance, and durability. Whether you’re working with picture frames, glass tabletops, windows, or decorative panels, applying a smooth radius to the glass corners requires care, tools, and proper technique. Below is a clear method to follow.
Safety: Sharp corners are susceptible to chipping and can injure people. A rounded edge reduces that risk.
Aesthetics: Rounded corners give a polished, finished look.
Durability: Sharp edges are stress concentrators; rounding reduces stress concentration and makes the glass less prone to cracks.
Glass sheet (tempered or annealed, depending on your project)
Diamond grinding wheel or diamond wheel bit
Silicone carbide (SiC) or diamond abrasives (for finishing)
Water drip system or coolant (to keep glass cool during grinding)
Marker and template (to mark the corner radius)
Clamps or suction cups (to hold glass securely)
Polishing pad / felt wheel
Protective gear: safety goggles, gloves, mask
Decide the radius (e.g. 5 mm, 10 mm) you want for each corner.
Use a template or a compass to draw the quarter-circle arc on each corner of the glass with a fine marker or grease pencil.
Secure the glass on your work surface using suction cups or clamps. Make sure the corner to be worked on is properly supported and won’t shift.
Choose a coarse diamond wheel (e.g. 180–220 grit diamond profile wheel).
Align the wheel so that it will follow the quarter-circle path you marked.
Begin slow, gentle grinding using light pressure, moving the wheel along the curve.
Use a continuous water drip or coolant spray to avoid overheating the glass and to flush away debris.
It’s better to make several light passes than one heavy pass.
After rough shaping, switch to a finer wheel or abrasive (for example, 320 grit or 400 grit).
Continue following the same curved path, refining the shape and removing tool marks.
Keep the glass wet and clean.
Check periodically with light and touch for smoothness and consistency.
Use very fine abrasives or polishing compounds (e.g. cerium oxide or diamond slurry ~1,000–3,000 grit) on a felt or cloth pad.
Polish the corner surface along the curve, maintaining constant contact and gentle pressure.
Continue until the corner is smooth and transparent, without haze or scratches.
Visually inspect each corner under light to spot any pits, micro-chips, or ridges.
Run your finger (wearing a glove) along the rounded edge to feel for uniformity.
If any unevenness remains, repeat finer polishing or localized touch grinding.
Use gentle pressure — overpressure leads to cracks or chipping.
Consistent coolant is key — dry grinding will cause overheating, stress, or cracks.
Take your time — patience pays off in smoother results.
Work in stages — coarse → medium → fine → polish.
Maintain tools — diamond wheels must be dressed or trued so that their surface remains effective.
For large volumes or industrial applications, manual methods are slow and less consistent. A glass edging or corner rounding machine can deliver repeatable, high-precision results in less time.
If you’re looking for professional glass processing machinery, ADDTECH is a reliable manufacturer. Based in Guangdong, ADDTECH offers high-precision glass machines including edging, beveling, 45° edging, pencil edging, and more. Their machines are stable, maintainable, and certified (EU CE). You can learn more about their equipment and capabilities at their official site.
Rounding corners on glass is a delicate balancing act between material removal and surface finishing. By following the staged approach (rough grind → smoothing → polishing), applying consistent coolant, and working carefully, you can produce clean, safe, and attractive rounded glass corners. For higher throughput or professional-level finish, consider employing a specialized machine — and manufacturers like ADDTECH can supply suitable glass processing equipment tailored to your needs.
