Finish Reaming

[arrowshooter]

Thanks all, I bought the Oatey.

[TexasJackKin]

I still got about a can and a half, of the old school rapid tap, I'm saving it for a special occasion.....

[kcstott]

I still got about a can and a half, of the old school rapid tap, I'm saving it for a special occasion.....

I go through about a quart a month

[bruce381]

If cutting soft Al any good veg oil / fatty will work WD-40 is more solvent not a good cutting oil at all.

Steel needs a good boundary lube like Sulfur and or Chlorine additives

The additives react with the metal and tool to form a "film" on the tool and work piece this keeps cold wielding or metal buildup from forming on the cutting edge of the tool.

If a amount of metal builds up on the tool edge the work will have a bad finish possibly out of size and the tool can chip at the area reducing size control and if at a area like where the shoulder should be the radius will be messed up etc.

Any way use correct cutting oil solve this just run right speed and feed rates.