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Drilling into type 321ss
2

Drilling into type 321ss

Drilling into type 321ss

(OP)
Need info on drill type, speed, pilot size drill for a 3/4 in. Hole drilled through a flange at 90 deg. To flange face for a pressure tap. Thickness of flange is 6 in. Concern about chips and wear on drill. Also suggest coolant type and rate.

RE: Drilling into type 321ss

Do you need a hole that big just to sense the pressure?

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Drilling into type 321ss

How many of these holes and on what type of machine? Are there any other parameters that you are concerned about?

RE: Drilling into type 321ss

Here is what I would use.

Drill Kennametal Dynapoint with thru coolant. Kennametal Catalog # K210A07500HP
Speed / Feed 270 SFM and .010 IPR

This Sir is all you will need for tooling. Do not spot drill for the hole just drill it.

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