Newbie here...Parameters of Drilling of Stainless Steel 304

[bibihang]

Hey guys!

I am new to my job and I need to conduct a drilling on a stainless steel 304 plate on my work. But I know that austenitic stainless steel is not an easy material to deal with, so I am looking for a suitable drilling parameters to do this before I break the drill bit

So, here are the information of the tool and workpiece:

Drill bit : ATI Garryson tungsten-carbide drill
No. of flute: 2-flute
Diameter : 5mm
Workpiece : Stainless Steel 304
Workpiece thickness: 6mm
Hole type : Thru hole

So may I know the optimum drilling parameters for this situation? What is the cutting speed and feed rate should I choose?

Your help is highly appreciated. My supervisor require me to complete the drilling as soon as possible...

[fizzissist]

Don't see any ATI "Garryson" drills, only Stellram...

A good place to start would be around 250SFM, and a feed of about .004"/rev.
....or a ballpark of 4500rpm, and 10ipm feed.

[Bgeise]

250 Sfm might be a little fast especially if you are looking for good tool life i would say 100-150 sfm with .003 chip load so say you are 125 sfm that would be 2424 rpm and 14.5 ipm

[Khalid]

Better is to use HSCO drill..

[bibihang]

Thanks for the input guys. Well since I am new to this so I am going to do it in a conservative way to prevent massive heat generation and tool breakage, so is it safe to drill with 800, 900, and 1000rpm and feed rate of around 3.94ipm? I am new to this and my concept might be wrong.

Thank you.