20 x D drills

[K2csq7]

I have some holes that are .096 & .157 dia.

Both are tight tolerance (reamer after) true position of .005, I need to get them about 2.0" deep in 17-4 stainless.

Going to get a hold of kennametal for some 20 x D drills, can anyone suggest something they have actually done similar to this that worked? Mitsubishi? Ghuring?

I am mostly concerned with keeping the holes straight.

Thanks.

[Pilot Plant Supervisor]

I have had very good luck with Guhring gun drills in Titanium. .078" X 4" deep. It is slow, but hole quality is excellent. If you have high pressure through spindle coolant, give it a try.

[K2csq7]

I have 1k psi thru tool coolant.

 

Also looking for long reamers if anyone has suggestions...

[Jeremy Herron@DBS Solutions™]

Use a 2-3 x D start drll, or endmill a hole 2 x D deep to help keep the hole straight and control size. Fullerton makes a good special order reamer really quick if you cannot find one.

[Chipmakr]

I have had excellent results with Mitsubishi drills & the crazy drill shown below.

 

http://www.mikron.com/fileadmin/customer/2_Pdfs/3_Mikron_Machining/Cutting-Tools/Products/Crazy_Drill/CrazyDrill_Pilot__english.pdf

 

http://www.mikron.com/en/mikron-machining/cutting-tools/products/crazydrill/

[HEAVY METAL]

OSG drills here

[CR]

• ditto to the Mitsubishi drills I drilled a lot of hole 0.125x40 titanium coolent thru NO peck perfec side good finish, it needs a starting hole with a short drill first then give the long drill slow rpm place it inside the hole bring the rpm up and drill it NO peck
  

[K2csq7]

Thanks everyone,

I just got back from Mikron. Picked up some CRAZY DRILLS, and the Crazy drill pilot drills to!

Hope to find out weather or not they work soon.

I would have bought Mitsu, but the rep still hasn't called back.

[Matthew Hajicek - Singularity]

I've been using OSG 3XD, 5XD, 8XD, 10XD and one 20XD in H13. So far so good. I've also used some gun drills in the horizontal and it worked beautifully.

[K2csq7]

The Crazy drills worked fantastically.

The invoice for the Crazy drills was breathtaking! LOL, you get what you pay for!

[Chipmakr]

Glad to hear the crazy drills worked for you. They must be right around the corner from you?

[K2csq7]

Glad to hear the crazy drills worked for you. They must be right around the corner from you?

A little over an hour away.

Man, those drills are CRAZY!!!!

Thanks again!

[crazy^millman]

Okay I keep hearing my ears buring and I found out why. People and that cRazy tlalk I tell you just crazy.

[GoetzInd]

I've got some 1/8 Guerings going 25xd in 316 SS. HMC 1000PSI. I'll post how it turns out. Never used a coolant drill that small before.

 

Mike

[Bocho]

I haven't tried the smaller ones yet, but iv'e been drilling 20x with 1/2'' and 7/16'' Titex drills. We have been most impressed in HRS, and Beryllium.

Going to drill 11'' in P20 this week. I'm not expecting any non pleasant surprises. At 15 inches feed on 1/2'' in HRS we get about 400 holes. Its one thing to see it on Utube, but to stand there and see it for real is a kick. We get a fair deal from our Walter tool Rep.

[K2csq7]

Its one thing to see it on Utube, but to stand there and see it for real is a kick.

Watching those Crazy drills was like magic!

[?Mark]

I have some holes that are .096 & .157 dia.

Both are tight tolerance (reamer after) true position of .005, I need to get them about 2.0" deep in 17-4 stainless.

Going to get a hold of kennametal for some 20 x D drills, can anyone suggest something they have actually done similar to this that worked? Mitsubishi? Ghuring?

I am mostly concerned with keeping the holes straight.

Thanks.

Old thread...

Good starting choices right there (add sumitomo to the mix and surprisingly iscar works well too, but limited in length). You're not saying which 17-4ph you're cutting. That makes a huge difference! On deep holes in this kind of material, starting straight is paramount. I like what Jeremy suggested.I always used center drill, just a point .010-.020 deep (no spot drill). The same brand short and longer drills. Always used 1000psi coolant thru...You will likely have to chip break, no matter what the salesman tells you

Never heard of those "crazy" drills, another tool in the toolbox

[K2csq7]

Never heard of those "crazy" drills, another tool in the toolbox

Mark, if you ever have an application for them in the future, TRY THEM!

No peck, fantastic surface finish, excellent positioning/straightness. Get the Crazy pilot drills that they reccommend... they also make some for drilling on angled/curved surfaces. They blew my mind...