The video features a long-bed automatic straightener built for shafts several meters in length. A gantry-style frame rides along an extended bed, 5 to 8 or more measuring probes sample straightness at stations distributed over the full shaft length, and the control compensates for gravity sag — the natural downward deflection of a long shaft between supports — before calculating each correction.
Without sag compensation a perfectly straight long shaft reads as bent under its own weight; the machine subtracts this deflection mathematically so the press only chases real bend, bringing long slender parts from the 0.10–0.30 mm/m as-received condition to automotive tolerance of 0.02–0.05 mm where required. Our article on TIR and straightness measurement details the probing method.
Lead screws, pump and compressor shafts, printing and roller shafts and transmission long shafts up to 12 m are typical work, and automatic multi-point correction is 5–10 times faster than sectional hand straightening. Supports can be repositioned along the bed for different part lengths, and the operator interface shows the bending curve so results are documented rather than left to judgment. Standard models and custom beds are listed in the automatic machine range.
Ready to move on from hand straightening? Send us your shaft drawings for a machine proposal, or arrange a visit to our Tengzhou factory.
Extended gantry bed for shafts up to 12 m long
5–8+ probes distributed along the full shaft length
Gravity sag compensation removes false bend readings
From 0.10–0.30 mm/m as-received to 0.02–0.05 mm TIR
For lead screws, pump shafts, rollers and transmission shafts
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