Laser cutting machines honeycomb

How to Check a Honeycomb Worktable – What to Look for Before You Put It on Your Laser

You can't always tell a good honeycomb table from the price. Some look fine in the box. Put them on the machine, nothing sits flat. Cuts come out uneven. Small parts fall through. Edges are rough.

Here's how we check them. No fancy tools. Just eyes, a straightedge, and a few minutes.

Flatness First

Flatness is the big one. If the table isn't flat, nothing else matters.

Lay a straightedge across the surface. Long ruler, level, anything with a straight edge. Put it diagonal across the table. Then side to side. Look for gaps underneath.

If you can slide a business card under the straightedge in the middle, the table is bowed. That means your material won't sit flat. Laser focus drifts across the bed. Some parts cut through, some don't. A good table is flat within a fraction of a millimeter.

Look at the Cells

Hold the table up to the light. The honeycomb cells should all look the same. Same size, same shape, same spacing.

If the cells are squashed, stretched, or crooked, the table was made with worn tooling or sloppy work. Uneven cells mean uneven support. Thin material can sag. Small parts can tilt during a cut. Dark spots or crooked rows? That's a red flag.

Check the Edges and Size

Put the table against a known straight edge – a machinist square or a factory edge on another piece of material. Corners should be exactly 90 degrees. Some cheap tables aren't even square. You put them on the machine and they don't align. You have to shim them or fight them.

Also measure the actual size. Some suppliers round up. A 600x400 table might be 590x390 when you actually measure it. Check.

Surface Condition

Look at the surface. Deep scratches? Rust spots? Oxidation? Dents?

A few minor scratches are fine. It's a work surface. Deep gouges catch on material. Rust transfers to your workpiece. Dents make high and low spots. Aluminum tables should look clean. White powder means corrosion starting.

Now the Welds

Honeycomb core is welded to the frame. Bad welds, the table falls apart over time.

Look at the weld joints. They should be smooth and continuous. No gaps, no rough blobs.

Check for burn‑through. Weld too hot, melts through the honeycomb walls. Cells around the weld get deformed or missing. Weakens the structure.

Look for skipped welds. Some tables only weld at intervals. Core separates from the frame over time. Starts rattling. Flatness goes.

Run your finger along the weld bead. Should be smooth, not sharp or jagged. Sharp edges catch material or cut your hand.

The Process Tells You Something

Good table uses vacuum brazing. Whole table heated in a vacuum furnace. Filler metal melts, flows into every joint. Bonds honeycomb to frame at every contact point.

Cheaper tables use spot welding or resistance welding. Welds at specific points, not the whole contact area. Core delaminates over time. Vibration shakes it apart.

You can't always tell the process from outside. But if the weld joints are continuous and uniform, and the table feels solid, it's probably brazed.

Shake It

Pick the table up. Shake it gently near your ear.

Hear rattling? Loose debris in the cells, or the core is already separating from the frame. Either way, bad sign. Solid table doesn't rattle.

Bottom Line

Check flatness. Check cells. Check edges. Check size. Check surface. Check welds. Shake it.

If any of these look wrong, walk away. The table might look fine from across the room, but it'll give you trouble every day.

We make good ones. That's what we do.