Instructions given here are for the inch version of the boring head.
Rather than try to make one set of instructions work for both using double numbers, we have created a separate set for the metric version which is supplied when that product is purchased. Use of the Boring Head Boring holes on a mill is very similar to boring holes on a lathe except the cutting tool moves rather than the part. Index Bottom slide 180 for boring small diameter holes. Tools put in the Sherline boring head should be as short as possible to keep set ups as rigid as possible. It is easier to bore a hole completely through a part than to cut into a flat bottom hole.