Drill Recommendation From your experiences

randyt88rsb · Apr 30, 2019

Looking for reccomendations on your guys favorite drills/inserted drills.

Will be used in a live tool lathe. Axial and radial holes both .3125 diameter not very deep maybe .500.

Material is 303 stainless. tolerance is plus/minus .002

Looking to tool up for decent size production runs.

TeachMePlease · Apr 30, 2019

My go to brand for solid carbide. Good product, great prices, great performance. Never used one of these in this size (5/16" is bigger than most of my bar stock), but I've used their tiny drills, and they're awesome.

https://maford.com/product-details/20631250A

fmari --MariTool- · Apr 30, 2019

For 5/16 I would go with solid carbide. Indexable under 1/2 dia are kinda problematic. At least from my experiences.

These work good....
Solid Carbide G3 Series Drill .3125 diameter X 1.457 Flute Length TiAlCN MariTool

Also these are even better, just more expensive..

Solid Carbide CJT Series #114A Drill .3125 dia X 1.438 flute MariTool

These are your best choice, only if your live tools have coolant thru..

Solid Carbide Coolant Thru Drill 294A Series .3125 Diameter MariTool

For the first 2 I would run 230 sfpm and .0045 feed per tooth.
I am assuming normal to bad 303 stainless. If 303MAX or some other version of a free machining stainless increase 20%.

First peck after 1X diameter, after that peck every .6X diameter.

For coolant thru 250sfpm and .005 ipt.

Good luck.

aj · May 1, 2019

randyt88rsb said:
Will be used in a live tool lathe. Axial and radial holes both .3125 diameter not very deep maybe .500.
Material is 303 stainless. tolerance is plus/minus .002

We run a LOT of production stainless 303/316 parts. Our favorite is from YG and called a 'Dream Drill'. You can get them in inch or metric. Through-coolant wherever you can. You might consider a 7.9mm (0.311) for 0.3125 +/-0.002.

I'd also keep in mind the "drill rules":

1) When you need it to be under the drill will cut over.
2) When you need it to be over the drill will cut under.
3) When you don't care it'll cut right on size.

fmari --MariTool- · May 1, 2019

aj said:
I'd also keep in mind the "drill rules":

1) When you need it to be under the drill will cut over.
2) When you need it to be over the drill will cut under.
3) When you don't care it'll cut right on size.

Don't forget these rules.

If you buy 1 drill it will break just before you are done with the job.
If you buy 2 or more drills that one drill will run the entire lot and finish the job.

Tichy · May 1, 2019

Kennametal GoDrill 8mm. Lasts forever. Can be run very fast. For the shallow holes you suggest it will do wonders. I'd start at Vc 40 and F0.1 conservatively.

So: S1600 F160.

Fal Grunt · May 1, 2019

Guhring is my go to for tough applications and production work.

However, that being said, I made tons of chips with YG Dream Drills in Tool steel.

Gobo · May 1, 2019

Also, get a high quality holder for those drills. The tool is only as good as the holder.

aj · May 1, 2019

fmari --MariTool- said:
Don't forget these rules.

If you buy 1 drill it will break just before you are done with the job.
If you buy 2 or more drills that one drill will run the entire lot and finish the job.

That's a fact, Jack!

13engines · May 2, 2019

aj said:
We run a LOT of production stainless 303/316 parts. Our favorite is from YG and called a 'Dream Drill'. You can get them in inch or metric. Through-coolant wherever you can.

I second the "Dream Drills" from YG. Run at higher feed rates too then others I've checked into.

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Drill Recommendation From your experiences

randyt88rsb

Plastic

TeachMePlease

Diamond

fmari --MariTool-

Titanium

aj

Hot Rolled

fmari --MariTool-

Titanium

Tichy

Aluminum

Fal Grunt

Titanium

Gobo

Titanium

aj

Hot Rolled

13engines

Stainless

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