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Tapping 6 mm threads in 304 stainless

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krv3000:
brill

sparky961:

--- Quote from: DavidA on April 19, 2016, 02:06:52 PM ---I did a lot of tapping of stainless steel when I worked at the chicken factory.

I always used a 5.2 mm drill and 'food lube' as a cutting fluid.  Never broke a tap in five years.

Dave.

--- End quote ---

"Food Lube" .... makes me think of greasing the chicken before it goes through the machine.

A little pet peve of mine is seeing people drown the tap in cutting oil.  This is usually unnecessary and wasteful.  As long as there's a film, and enough that it doesn't get hot and all turn to smoke, you've got enough.  Anything that drips, runs or flies off the tool isn't doing you any good.  Many coatings help by being somewhat porous and keeping an amount of oil near the tool's surface.

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