Is flow drilling necessary for furniture-frame tubes?

Flow drilling is most useful on thin-wall tubes—generally under 5 mm wall thickness—where a standard drilled hole does not leave enough material for strong threads. The flow-drilling process forms a bushing that adds thread engagement length. If your tubes have walls of 5 mm or thicker, conventional drilling followed by cut or form tapping may provide sufficient thread strength. Confirm with your tap and flow-drill tool suppliers based on the actual material and thread size.

How do I prevent tube deformation during clamping?

Use profile-matched clamp jaws that distribute force across a wide contact area. Reduce clamping pressure to the minimum needed to prevent tube rotation during drilling and tapping. For thin-wall tubes, consider internal mandrels or support inserts that resist inward collapse. Test clamping on a sample tube and measure the cross-section afterward to confirm the tube stays within tolerance.

Can one machine handle both round and square tubes?

Many CNC tube drilling and tapping machines accept both profiles by changing the clamping tooling—swapping V-block jaws for flat jaws, for example. Some machines use rail-mounted pneumatic fixtures that allow quick profile changes. Ask the supplier about changeover time and whether the fixture change requires recalibration of hole positions.

What information should I send when requesting a quote?

Prepare a list of tube profiles and dimensions, hole patterns with positions and diameters, thread sizes and depths, material grades, surface conditions, daily production volume, batch sizes, and tolerance requirements. A dimensioned drawing or CAD file of your most common part speeds up the quoting process and helps the supplier recommend the right machine configuration.