Gallery, Projects and General > How do I??

Tapping 6 mm threads in 304 stainless

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sparky961:

--- Quote from: Jonny on April 18, 2016, 06:58:39 AM ---I generally use the coloured ring taps either red for hard materials, yellow or blue for aluminiums, never tried the green.

--- End quote ---

Just a heads up - check the intended application for the tap, not just colour. There is no standard that can be relied on.

304 SS isn't hard, but it quickly work hardens is your speed is too fast or feed too light. Turn as slow as time allows and feed as hard as machine and tools allow. A generalization, of course, but not far off.

ieezitin:
Smiffy

Spiral taps sure are the tits but 180 holes is a project worth planning out. Give thread-forming taps a look...( a form tool tap) they are more expensive but are very unlikely to snap or dull on the right conditions like spiral or regular taps... they make a Tin coating for stainless which is forms with ease.

They thread better and the threads are formed harder and sharper due to work hardening with the added benefit of no mess with chips so you don't have to clean out the holes, they do not adhere to the regular pilot hole size charts so you need to find out what the correct size to drill first for that size tap. Power tapping will be a doddel and if you are in a blind hole the plug can be finished off by hand at 6mm. one tap is probably capable of doing all 180 holes. They leave a double peak on the thread which looks a little funny but its a part of the process.

Hit these cats up they make an outstanding product, Also somewhere in the website they show a little video on how these taps work.

http://balax.com/browse-products?category=7


Hope this helps brother.... Happy tapping.

Anthony.

krv3000:
hi just my bit I wont go it to the maths but drill your taping hole 1 two 2% bigger for stainless

j1312v:
 I normally go 0.1 bigger or more on the drill and it helps quite a LOT...that gives aprox. a 65% full thread the witch is a small percent less stronger as a 75% thread as per the standard formula.

DavidA:
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.

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