Gents, We have a project here that requires drilling a couple hundred roughly two inch deep approximately .4" diameter holes (exact dia has not been determined yet) in some 410 SS turbine seal housings (the holes were left out by mistake in the design). I don't know if 410 ss is heat treatable or if it is, if it has been heat treated. It's a lightly stressed housing and not subject to wear so I don't believe it's been subject to any particular heat treat process.
The plot thickens because the turbines are on a small island in the Pacific. We have a reasonable machine shop and fairly skilled labor, but it's not a fully industrialized place.
We're concerned about bit life in the 410 stainless steel. We have time to order enough bits from the outside world. Is there any special bit coating we should specify? Flute angle or anything else that will help with the 410 stainless? Any special cutting oil or recommended bit speeds? Any special precautions to take?
Sure appreciate any comments or suggestions.
Bob Thomasson email: bobthomassonatyahoodotcom