Amada AC-255NT
Turret Sleeving

Amada AC-255NT at a glance

Era

2008

Tonnage

22 ton

Stations

58

Turret

Thick turret

Auto-Index

4 A/I

Control

Fanuc AMNC NT

The AE line has been in production since 2008. Servo-electric and comparatively efficient, these are current machines where downtime, not machine age, is the deciding cost.

Where this machine is in its life

The AC-255NT is a current-generation machine (2008). If yours is showing turret wear, it is not because the machine is old — it is because it has been working. High-utilisation machines reach the same bore wear in a fraction of the calendar time.

On a machine this current, the dominant cost is not the repair. It is the production you lose while it is out, which is why the work is done on your floor in days rather than the machine going anywhere.

How a AC-255NT turret wears

At 22 tons, the AC-255NT is a lighter, faster machine, and its turret wear pattern reflects that. wear accumulates through sheer cycle volume rather than force per hit. A high-throughput shop can put more hits through a 22-ton machine in a year than a heavy press sees in five.

With 58 stations, work is spread across a wide turret, which is why wear on these machines is so rarely uniform. In practice a handful of stations carry the common tools and wear out well ahead of the rest. Most AC-255NT jobs are partial as a result — the worn stations are sleeved and the sound ones are left alone, which keeps both cost and downtime down.

The tell is always the same: the fault stays with the station rather than following the tool. Move a tool that is producing bad parts to another station — if it runs clean there, the bore is worn, and new tooling will not change that. See holes out of round or burring on punched parts for the full diagnosis.

What sleeving a AC-255NT involves

Each worn bore is machined to a precise oversize and a hardened USA-made steel sleeve is pressed in with an interference fit, restoring the station to Amada factory tolerance — typically within 0.0002″. Engineers travel to you; the AC-255NT never ships. 2–3 days of downtime, typically $8,000–$25,000 depending on scope. After the first install your own maintenance staff can replace sleeves in future.

Set against $100,000–$500,000+ for a replacement machine — see sleeve or replace, including where replacing genuinely wins.

4 A/I on this machine

The AC-255NT carries 4 auto-index stations of its 58. Auto-index stations rotate tooling in 0.01° increments through gears, bearings and a rotary encoder mechanism — all in constant motion, all wearing. Symptoms are angular drift, indexing errors, alarm codes and parts punched off-angle.

TSI rebuilds them completely and calibrates before sign-off, routinely in the same visit as sleeving. Auto-index refurbishment · diagnosing angle errors.

Is the AC-255NT a thick or thin turret machine?

The AC-255NT is a thick turret machine. Thick and thin describe the turret, not automatically the tooling — the two are quoted separately, and a machine has to be identified on both counts before sleeves or tooling are ordered.

Tonnage will not tell you either: several 22-ton Amada machines run thick turrets. If you are not certain what your press carries, send us the model and serial number and we will confirm it. See also thick vs thin turret and how Amada model numbers work.

How the AC-255NT compares

Variant of AE-255NT — that is what sets this machine apart on the spec sheet.

These machines are easy to mix up, and the difference matters when you are quoting a turret job. Against the other AE models we cover:

• Amada AE-2510NT — stations 45, era 2008-present.
• Amada AE-255NT — stations 45/51/58, era 2008-present.

Sleeving is the same process across all of them. What changes is scope, and scope follows station count and how hard the machine has been run.

Beyond the turret

The AC-255NT runs the Fanuc AMNC NT control — current-generation, and not usually a candidate for retrofit. Where a machine of this age needs more than turret work, it is normally wear items: X/Y ball screws, LM guide rails, clutch and brake, work holder clamps, guide keys, springs and collars. All covered under complete overhaul, on-site, in the same visit.

Amada AC-255NT documentation

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