Need Help!- drillng 302 stainless steel

[Reg wharton]

I,m drilling a 13/32 dia. hole 1.88 deep. What's the best drill to use? I would also like to know speeds and feeds.

thankx

[g-codeguy]

Mill? Lathe? Coolant? Coolant pressure?

[Reg wharton]

I'm using a lathe with plenty of coolant and pressure.

[g-codeguy]

Does it have a Fanuc type control so you can use a macro deep drilling subprogram? Sorry for not asking this earlier.

[Reg wharton]

I,m using a nakamura with fanuc control.I'm new to this machine.I have tried g83 but only throws an alarm.The other guys in the shop say this machine does not support drilling cycles.I find that hard to believe.I will research this and try to find some kind of manual on this machine.Right now the program is written out the long way(this program was used last time they ran the job).


Thanks for the reply

[Paul V]

Reg have you tried cobalt drills at a slow speed. I have drilled ss with tin coated drill at a slow speed. You can also drill harder steel with a concrete dill bit , regrind the angle on it
as you would a metal drill bit.

PaulV

[dertsap]

solid carbide is your best bet if your running production , if you weigh the cost against the time saved ,you may find you've saved money

[shay z]

try iscar's camdrills. you will get the carbide replaceable cutting bit with the flexibility of the HSS drill.

[Reg wharton]

Thanks for all the input fellas, I ended up going with solid carbide. I started with a high speed drill that took 3 min./pc. Now I'm turning 2300rpm @ .006 ipm. It now takes approx. 15 sec.


Thanks again for all your help.

[g-codeguy]

Originally Posted by Reg wharton Thanks for all the input fellas, I ended up going with solid carbide. I started with a high speed drill that took 3 min./pc. Now I'm turning 2300rpm @ .006 ipm. It now takes approx. 15 sec. Thanks again for all your help.

Carbide is definitely the way to go if it holds up. Our lathes haven't any coolant pressure higher than about 135 psi. Not the best for drilling holes that deep without an additional peck or two. One shot normally blows them up in short order. Although I've been told you shouldn't peck with carbide drills, that is the only way to make them last for us.

Drilling is where the most time can be saved. It doesn't pay to go cheap. Maybe one of the reasons we can't drill this deep in one shot is our purchasing agent buys the cheapest drills he can find. He gets a bigger bonus the more he saves on tooling.