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Excuse me if you're already aware of this, but 304 work hardens, so you want a respectable feed rate. Kissing the work gently is a bad idea with 304. When you are cutting, cut. The feed rates suggested in the Carbide Depot link should keep you out of trouble.
I need to drill .500 dia. thru hole in 304 stainless,
Material is 1" thick,
Any: tool, feed and speed recommendation,
Thank you,
Material: 304 Stainless Cold Rolled 225-275 HB
Tool: 0.500in 2FL HSCobalt TiN Jobber twist Drill
Speed: 30.0 SFM/ 229.3RPM
Feed: 0.0039 in/tooth 0.0078 in/rev 1.78 in/min
Material: 304 Stainless Cold Rolled 225-275 HB
Tool: 0.500in 2FL Carbide TiAlN Jobber twist Drill
Speed: 136.0 SFM/ 1039.5RPM
Feed: 0.0042 in/tooth 0.0085 in/rev 8.81 in/min
Material: 304 Stainless Cold Rolled 225-275 HB
Tool: 0.500in 2FL Carbide TiAlN Jobber twist Drill
Speed: 204.0 SFM/ 1559.2RPM
Feed: 0.0042 in/tooth 0.0085 in/rev 13.22 in/min
304 SS varies considerably from cold rolled work harden to annealed condition
.
approximately the tensile strength is 2x higher and 2x harder to machine cold rolled or cold finished 304SS
.
so feeds and speeds got a spread in numbers. there is no exact answer best for all 304 SS
* So I will respond like this: "speeds and feeds too broad to recommend anything useful... But I have to write sumethin'"
8)
big difference in a guy with a low hp drill press and only hss jobber twist drills and another with a 20 hp cnc and carbide drills, a rigid part, good vise and through spindle coolant
.
not for nothing but i have bosses that fire a person if part scrapped and be pissed if you broke a $5 drill bit. makes a difference in how things are done
MAN!
You are super negative!
And/Or you are super unlucky(to put it mildly) to work with people like that.
I live in a perfect world compared to what you are talking about.
Luckily it does not seem like many people live in your kind of world.
Cheers!
I need to drill .500 dia. thru hole in 304 stainless,
Material is 1" thick,
Any: tool, feed and speed recommendation,
Thank you,
Depending on part tolerance any one of these this should do it fairly quickly:
5 BMG Rifles
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