17-4 stainless
17-4 stainless
(OP)
hello
need help on what kind of drill to use for drilling 17-4 stainless steel in the soft condition.
also what speeds and feeds to use.
.600 deep with .386 dia. drill with no coolant holes-will be bore after drilling.
machined on newer mazak lathe.
thanks in advance
need help on what kind of drill to use for drilling 17-4 stainless steel in the soft condition.
also what speeds and feeds to use.
.600 deep with .386 dia. drill with no coolant holes-will be bore after drilling.
machined on newer mazak lathe.
thanks in advance





RE: 17-4 stainless
personally i like titex drils but at least in israel the are very expensive.
RE: 17-4 stainless
Manufacturing Freeware and Shareware
http://mrainey.freeservers.com
RE: 17-4 stainless
RE: 17-4 stainless
RE: 17-4 stainless
ih this diameter you can drill with no fear.
RE: 17-4 stainless
I have had success in drilling 17-4 with the following drill from Guhring:
Series #329
Guhring has a .3858"(letter "W") in their book. It has 1.7" of flute length which will be fine for your hole depth. Start out at 450 rpm with a feed of 2.3 ipm. Do not use the pecking cycle as this may contribute to work hardening of the material.
You will be fine with this drill.
RE: 17-4 stainless
I work in the sensor industry where 17-4 is a standard material. My company uses about 60-70 tons of 17-4 each year.
As far as speeds for HHS drill I use this little formula 191/drill dia. this works very well.
Sorry to disagree with oithers here but pecking drill 17-4 is not usually a problem you need to break those chips particularly on deep holes. Do flood the area with coolant.
RE: 17-4 stainless
RE: 17-4 stainless
We used the same type bit up to 8 mm and probably a little larger. This manufacturing group stayed with Gurhring for all their drilling operation involving the PH alloys.
Art. No. 658 K
DIN 338 RN
S-Bohrer GT1
f 3.28 mm
HSCO EDBB **
These are used for blind holes 22mm to 30 mm deep in hardened PH alloys.
These are used on highly automated (Burgomaster) drill presses running 24/7/365. These drill bits are TiN (golden) and are resharpened and recoated several times.
I think this particular drill bit has been replaced lately with another style Gurhring in the same family, but this type was used for many years.
I thought I could give you some idea of the feeds and speed but I’m having trouble getting the time of day from the people presently in charge of this operation.
RE: 17-4 stainless
Fill what's empty. Empty what's full. And scratch where it itches.
RE: 17-4 stainless
RE: 17-4 stainless