Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

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Default drill speed for stainless

what is the proper drill speed and best technique for drilling
stainless steel?

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Default drill speed for stainless


"El Cazador" wrote in message
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what is the proper drill speed and best technique for drilling
stainless steel?


slow and hard. SS work hardens, you need high feed slow speed. The instant
you stop getting a continous chip-STOP! Resharpen the drill and go again. I
like oil for SS, I don't use this anywhere else for drilling.

Karl


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Default drill speed for stainless

"El Cazador" wrote in message
oups.com...
what is the proper drill speed and best technique for drilling
stainless steel?


Depends on diameter, etc. These numbers are conservative for the most
part...

http://www.multi-drill.com/drill-speed-chart.htm

Some call the difficult drilling "work hardening" but I believe that
Stainless simply holds onto the high temperatures caused by cutting more
than other metals and thus a deep cut into "cool material" is needed to make
a clean, easy hole.

ALWAYS use coolant... Motor oil is cheap and works just fine but isn't very
environmentally friendly in bulk, etc.

No coolant? Say goodbye to your drills.

Too fast an RPM rate? Same thing... Adios.

Taking shallow cuts? Care to guess the outcome?

Much success to you in the project, whatever it is.

Regards,
Joe Agro, Jr.
(800) 871-5022
01.908.542.0244
Automatic / Pneumatic Drills: http://www.AutoDrill.com
Multiple Spindle Drills: http://www.Multi-Drill.com

V8013-R



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Default drill speed for stainless


"Joe AutoDrill" wrote in message
news:xyXAi.2$xg.1@trnddc05...
"El Cazador" wrote in message
oups.com...
what is the proper drill speed and best technique for drilling
stainless steel?


Depends on diameter, etc. These numbers are conservative for the most
part...

http://www.multi-drill.com/drill-speed-chart.htm

Some call the difficult drilling "work hardening" but I believe that
Stainless simply holds onto the high temperatures caused by cutting more
than other metals and thus a deep cut into "cool material" is needed to
make a clean, easy hole.


FWIW, there have been scientific studies of stainless-steel work hardening
that quantify the whole thing. The work-hardening is severe, and modeling
the chip-making in stainless by a conventional drill bit is not easy. But it
has been done, and the studies show that it does harden very quickly.

It also heats up, as you say, partly because it's very tough and partly
because stainless is a poor thermal conductor. All together, these factors
contribute to the difficulty of drilling stainless.

Years ago I drilled many hundreds of 304 stainless parts on a Herbert turret
lathe, feeding by hand. One slip, one pause, and you had trouble.

--
Ed Huntress


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Default drill speed for stainless

Thanks a lot. This really helps.

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