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wrote:

I've seen steel tables with a circular pattern applied to them... This
looks as though some type of circular tool has repeatedly produced a
circular 'swirl' effect on the steel. Each circle appears to be
layered/applied on top of the previous one as if this is a single tool
producing each circle in sequence. (each circle is about 50mm diameter
on a 1m x 1m table and applied in straight rows/columns).

I'm hoping someone understands what I am trying to explain and has seen
this type of effect before... and can cofirm how it is produced.

Thanks.

You got leads on engine turning.

Another term used for the same effect on gun parts is "jewelling"

You can scale the tool to the work at hand. I have done small items
with cratex abrasives or blue pen erasers, larger sheet metal parts with
sandpaper onna stick or 3M roloc style abrasive pad discs in a drill
press.

Key to getting it to look good is the even spacing. Even pressure from
spot to spot helps too.

Cheers
Trevor Jones