600 with same drill

[Fralex_francois]

I have to drill 600 times .500'', 3'' deep in 4140 steel

 

Is there anyone that can suggest me something

[Hardmill]

Guhring

 

 

PEACE

[Hardmill]

Lots to mention:

Extended length

Thru coolant

Coated

carbide

Too many options

 

www.guhring.com

 

 

PEACE

[Fralex_francois]

forgot to mentioned not coolant trought...

and does it matter if the face is rough (saw cut)

[robk]

+1 Hardmill

Check out their series 1042 RT 800WP drills with their Series #2485 Solid Carbide inserts. Those things will last forever.

If you're thinking solid carbide I suggest Mitsubishi MZS Type Drills over Guhring. Better speeds/feeds, and last a lot longer. If you insist on Guhring than try series 5510 over 5511 (regardless of what the sales guy says).

[Fralex_francois]

thank gonna call them

[robk]

quote:

---

forgot to mentioned not coolant trought...

and does it matter if the face is rough (saw cut)

---

Disregard my previous post

[Fralex_francois]

quote:

---

the face is rough

---

but I'm gonna do a spot drill

[robk]

quote:

---

but I'm gonna do a spot drill

---

Using solid carbide, spot drilling is not recommended (at least that is what I was always told).

You could also try using Sandvik carbide insert drills. You could get a "sleve" to turn your tool into "coolant through", but very expensive.

[somename75]

sandvic 7x dia thru coolant drills, expensive, but beat the hell out of guhring in my experience. 7x dia, no peck, just make sure that the chips are breaking properly.

 

good luck

[mario]

With RT-100 of Guhring never use de spot drill

 

it's my best bet

 

[Thee Cutterman]

quote:

---

. If you insist on Guhring than try series 5510 over 5511 (regardless of what the sales guy says).

 

---

+100 robk we learnt that over here to

Depending on cost Sandvik over Ghuring anyday

 

Regards

Darren

[jeff]

Iscar Cham Drills!!!!!!

The best carbide insert drill I have used!

[Diedesigner]

A less expensive alternative to the drills listed above are Precision Twist "QC" Parabolic TiN coated jobber length drills. Run them in 4130/4140 at 100 sfm, 5.0-6.0 ipm all day long, though you do need to peck them. A 1/2" will run $25-30 each.

 

Another alternative which will run at similar feeds and speeds is the Hertel "Max Output" TiAlN coated jobber length drill. A bit more expensive; around $30-35 for a 1/2" drill.

 

OSG "Ex-Gold" drills are good performing drills which do a great job of breaking up the chips. Because the chips are broken up by the unique tool point design, you can run them without pecking. A 1/2" drill will run you around $80.

 

I've used them all, and they all have worked well. One of the biggest factors in drill performance/tool life will be the rigidity of your set-up. If you are drilling plates suspended across parallels, I would caution the use of carbide tooling. Carbide works best in rigid set-ups.

[Diedesigner]

Giving it a second look, you're drilling 3" deep which implies a minmum of 3" thick material, so I doubt that there would be any rigity issues. My caution about carbide tooling applies to thinner plates supported only at the edges.

[Fralex_francois]

its not plate it's 3/4'' rod 4 1/2'' long