lathe drill

[Paul Felger]

Got about 100pcs to do that have a .500 dia drill 7.750 deep in 17-4 stainless... any suggestions on feeds and speeds, peck depth to make this drill last? only have one drill to do this...

thanks

[Rstewart]

All i can say is I Hope It's a Gun Drill......

[Paul Felger]

no its not... its a $350 carbide coolant thru and should be hear today

[Odell]

I would recommend getting a speed & feed chart for that mtrl. from the manufacturer.

[chris m]

What temper is the material? Is this a solid carbide drill? Whose drill? What is their recommendation? I think you're in deep sh!t trying to remove that much material with [1] tool, but if you have good coolant pressure you might get away with it.

 

C

[Goldorak]

be sure that your drill is as straight as possible

.0005 maximum deflection for this length

 

i got a job here in SS410 that i drill 3/8 x 5in deep with an OSG Exocarb max-oil coolant thru

[DODGERFAN]

if it is a carbide drill with thru coolant, i would NOT peck it at all. if you catch a chip on your return your buying a new drill. like goldorak said

make sure your drill is dead streight.

[Paul Felger]

well to make things worse someone ordered the drill with 3/4 short of flute... wtf? just got done grinding the shank down

[CR]

I agree NOT peck

carbide drill thru coolant

I done b4 in a 15-5

You need to do something about the 3/4 short of flute

chips need to go somewhere

[Randy Morton @ Clem Industrial]

Martin, we use the same OSG long series drills and they are fabulous. No pecking!

 

We use Exocarb Max Oil List 5270 drills. The book says for SS, 1/2" drill 20x - 30x, 1100 rpm, .01" - .014" feed.

 

Now, bear in mind that do do this, you must pilot this drill with the same size, bring this drill into the pilot hole at a reasonable rpm (100 - 500), then wind it up to full RPM and punch it!

 

On lots of our larger diameter drills we will run them at full speed cause the RPM isnt high (like the 1/2" drill). For small ones we use like 3/16" the RPM is much higher and without being stabalized in the pilot hole first, the drill will just snap off.

 

GL!

[GoetzInd]

quote:

---

You need to do something about the 3/4 short of flute

chips need to go somewhere

---

+1. There is no way you are gonna pull this off without good chip evacuation towards the end.

 

MIke