[handlewanker]

Use a boring head set to size for the final pass.
Ian.

[deadlykitten]

hi john rough until depth=h using a tool with normal chamfer, then finish until depth=h-0.03eq using a tool with smaller chamfer; for this to work, you need to measure both tools at same moment, because tool measuring senzor results values changes during a day, mostly because of termics

depending on setup, you may consider prefinishing with another tool, so to be sure that the finish tool is always cutting in constant ae; like this, using a 3 tools combo, you may push the roughing tool for longer

kindly

[the_catalyst]

Just as Ian said, use a boring head to ensure cylindricity. If is a single part or a small batch I´d rather use a holtest micrometer to measure the bore.

Greeting

Ari

Use a boring head set to size for the final pass.
Ian.

[deadlykitten]

hello, about reaming / cilindricity, etc, this is a pretty common thing; truth is that is much easier and reliable only to drill, while reaming may take longer

is ok to rough, is ok to finish, but is less productive to debur or ream ... so there are operations that are more productive than others, and a cnc which runs non-productive operations is less-profitable; this does not mean that it is not profitable

from this consideration, some shops avoid reaming operations on the cnc's; simply, because it is not productive, at least on small batches

so, is about some shades of gray / how do you believe that is organised such a shop that does not ream on the cnc ? kindly