Amada Coma 588
Turret Sleeving

Amada Coma 588 at a glance

Tonnage

50 ton

Turret

Thick turret

Auto-Index

4 A/I

The Coma line ran from the 1970s to 1994 and is long out of production. These are heavily built machines and a great many are still in daily service, which is precisely why turret restoration matters on them — there is no factory-fresh replacement to buy.

Where this machine is in its life

Whatever its build year, the Coma 588's upper turret station bores wear the same way: gradually, unevenly, and invisibly until hole quality starts failing inspection.

How a Coma 588 turret wears

At 50 tons, the Coma 588 is in the heavy class, and that changes how the turret wears. Every stroke puts substantial force through the station bore. Wear here is driven by load rather than cycle count, and it tends to show first in the stations carrying the largest tools on the thickest material.

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 Coma 588 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 Coma 588 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 Coma 588 carries 4 A/I. 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 Coma 588 a thick or thin turret machine?

The Coma 588 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.

Turret configurations for the Coma 588

The Coma 588 was not built with one turret. Amada offered more than one layout, so the station count does not follow from the model name — it has to be read off the machine. These are the configurations documented for this model:

A–E are Amada tool-station sizes: A ½″, B 1¼″, C 2″, D 3½″, E 4½″. A blank size column means the station and auto-index totals are confirmed but the factory A–E mix is not — we would rather leave it open than guess it.

Confirm before you quote. Because the Coma 588 exists in more than one layout, we verify the turret from the serial number or a photograph before pricing any sleeving. If you send us the serial number we will tell you which of the above you have, and how many stations that means. Send us the serial number.

What the number tells you

Amada model numbers describe the machine. The Coma 588 decodes as a 50-ton class press with a 80 × 80 table — the first digit is tonnage, the other two are table width and length. Its full designation is COMA-508080.

How to read an Amada model number — useful when your paperwork and your badge disagree.

How the Coma 588 compares

Larger Coma variant — specs to be added — 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 Coma models we cover:

• Amada Coma 567 — tonnage 50-55 ton, auto-index 2 A/I.
• Amada Coma 557 — tonnage 50-55 ton, auto-index Yes.
• Amada Coma 555 — the same on paper for turret purposes.

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.

Amada Coma 588 documentation

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