SHIMADA 2SI Twin Spindles: Indexing Time Versus Loading Time

The described mechanism allows loading at one spindle during machining at the other.

Technical application analysis. Turned components; example-specific dimensions; SHIMADA 2SI twin-spindle lathe; machining on one spindle while the other is prepared.

Reference configuration and timing

The described mechanism allows loading at one spindle during machining at the other.
The 0.9 s figure is spindle indexing; 2 s describes non-cutting time in the source.
A 12 s cutting plus 8 s non-cutting comparison and a separate 27 s two-operation example have different boundaries.

Engineering evaluation

Plot preparation and machining for both sides. If loading takes longer than the available cutting window, the next side still waits despite a short index. Confirm safe separation of the preparation area.

Check the six-inch and eight-inch versions separately for fixture space and spindle conditions. Do not move the seven-second and sixteen-second operations from a two-operation example into an unrelated single-operation comparison.

Selection conditions and evidence limits

This is a mechanism analysis of supplier examples, without a tested New Partner component or delivered-cell record. The 0.9 s is not a complete loading cycle.

Application questions

Can 0.9 s predict finished production?

No. Cutting, preparation, indexing and any unmatched waiting determine output.

What makes parallel preparation useful?

It must finish safely inside the other side’s cutting window.

Sources and evidence

Source record 89 — www.jc35.com (Chinese reference)

Reviewed 4 November 2026. Source statements and engineering evaluation are identified separately. The references do not establish a New Partner delivery or customer acceptance result.