Drilling 316SS Plate

[M. Anderson]

I am running some parts from 1.25" - 316SS plate. (waterjet to blocks on size)

And I have quite a few to run.

They have two .642 - .650 holes (thru).

 

I have tried Iscar's SumoCham drill, this drill was selected because according to Iscar it could be used with OR with-out coolant-thru.

 

My machine does not have coolant thru the spindle, but we have ran them on another machine that does have a coolant thru spindle and YES it did make the tips last a few more parts but still not like they should, for their cost.

 

The tips are breaking down, on both machines, like the carbide is fracturing off the edges, maybe BUE is causing it? I have tried light and heavy feed and low and high surface feet, don't matter the edges still break down.

 

At $70+ a pop for a new tip every 8 - 10 holes, this just aint working.

 

I can't be the only one on here who needs to drill in 316 SS, but I don't have much experience with SS.

 

I don't have a problem with buying good stuf - but this just aint working.

 

Anybody got some great words of WISDOM???

 

Thanks...

 

Mark

[YoDoug®]

I've never had very good results drilling ss316 with carbide without coolant through. Once you start drilling deep enough that you need to peck to get coolant back in the hole it seems that the tool life goes down considerably.

[Goldorak]

OSG makes an awesome drill for Stainless 300 series it's the EX-GOLD HSS series , you ca easily drill over 5000 holes with the same drill

[jeff]

OSG makes an awesome drill for Stainless 300 series it's the EX-GOLD HSS series , you ca easily drill over 5000 holes with the same drill

 

I agree with Goldorak, I've used the EX-SUS, and the EX-GOLD series HSS drills, and they last forever, if you use their speeds and feeds from their book.

I have a 1/2" drill that has drilled about 1000 holes in 316SS and it still looks brand new.

[Mic6]

if you use their speeds and feeds from their book.

^^ This

 

SFM will make or break tooling

[M. Anderson]

Goldorak, Jeff,

 

I assume you are peck drilling with the OSG's?

 

I looked at OSG's web site - 300 rpm and .012 ipr -

 

Iscar's recommended was like 164 sfm and .008 ipr, (~950 rpm at .642 dia), and it shure as H3!! wont live at that.

 

Any other recomendations...

[Goldorak]

Goldorak, Jeff,

 

I assume you are peck drilling with the OSG's?

 

 

No i drill strait down to the depth

[jeff]

I peck, because I don't have thru the tool coolant.