40 mm vs 60 mm Octagon Tube Roll Forming References

1. Selection principle

Pick by target tube across-flats and wall thickness for the shutter span/load — not by averaging OT40 and OT60 into one “octagon machine.” Each size keeps its own motors, press tonnage, stands, and thickness band.

2. How to choose

• Shorter / lighter curtains and thinner coil → start from OT40 documentation
• Thicker GI and heavier 60-class shafts → start from OT60 documentation
• Cassette multi-size hosts exist in the market — still quote the named size’s duty, not a blended kW

Market guides often map 40 mm to shorter/lighter curtains and 60 mm to longer spans — orientation only.

3. Reference parameters (keep sources separate)

4. Conflicts and open items

• OT60 speed unit — Anomalous mm/min string; leave public m/min open.
• High-speed English ~10–15 m/min — Same-pack alternate near OT40; not a merge key for OT60 Chinese baseline.
• Blended “octagon kW” — Never average dual 7.5 kW with single 11 kW.

5. Boundaries (related machines)

• Slat / guide / frame hosts — Different products; octagon is the winding shaft.
• ERW / downpipe — Different tube families.
• Dedicated OT40 / OT60 pages — Full parameter sheets; this page is the comparison map.

6. Buyer FAQ

One inquiry for “octagon tube machine”?

State 40 / 60 / cassette dual explicitly. Size and wall thickness decide the duty.

Can I run 60 mm coil on an OT40 baseline?

Do not assume that. OT40 Chinese thickness tops about 0.8 mm with dual 7.5 kW / 60 t; OT60 is a thicker GI package.

Why is OT60 speed missing a clean m/min?

Because the source unit string is anomalous. Confirm on the OT60 proposal rather than inventing a public number.

Are 60 t and 63 t “the same press”?

They are neighboring tonnage classes on different size sheets — still quote the named OT40 or OT60 proposal.