.15mm drill speeds

[Joel Schreiner]

Hello everyone.I have to drill a .15mm hole 5mm deep in 304ss. I only have one shot to do it. Max rpm is 8000 what do you think I should use for chip load and peck depth? The drill is carbide. I have not heard back form the manufacture and, I have to do it today.

thank you for any help.

Joel

[T_MALENA]

What type of coolant is in your machine?

We drill all types of matl' in oil, we use carbide & cobalt drills from Guhring.

 

Typ. rpm is apx. 3000-4000 & I start with a chipload of 1% the tool dia.

So I'd try 4000 rpm & F.2

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Make a good central drill hole or use sharp NC style central drill for hole 0.15 dia as a cd hole if it is 2 flutes drill and I doubt it is 3 flueter (3 fluter can work without a cd on flat surface ) peck depth 0.03 f20 good cooling fluedent on the drill .

I use for central drilling one fluet gun type solid drills with diameter of 1 mm ,they give nice little holes .

Now the point is you can break your drill on the entering when you jump out you can pull burr inside the hole or leave there a chip of metal so move down sslloooowwwly !!!! WITH g0 MINIMAL OR WRITE THE CUSTOM DRILL CYCLE.

Remember this -you can easily break drill entering the drilled hole especially near the upper surface or near the drilled bottom !!!!

I did this type of work for injectors with great success .

And tooling must be extragood -NO RADIAL BITTING !

TOOL HOLDER EXTRA SHORT AND WITH GOOD BALLANCE

HTH

[robk]

Coolant through? Who is the drill manufacturer?

[robk]

Coolant through? Who is the drill manufacturer, and the series of the drill from that manufacturer?

[Bruce Caulley]

0.15mm is only 6thou. No hope of thru coolant.

 

Be carefull that you do not have a lot of pressure from the coolant as we once had a job that had 0.35mm hoes in it. We couldn't work out why the drills were snapping as soon as they touched the job. Turns out they never got that far. As soon as the coolant was turned on the drill snapped.

 

Bruce

[robk]

My bad... Even though you write .15mm, I read 1.5mm. Man, that is a tiny hole

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Basically in this case I look on the tooling _ if you drill 5 mm but your tool length -s 10 mm 10/0.15 =67 extra non rigid !so less with speed

every one millimeter less height adds the rigidity

I doubt about f0.2 mm ,too slow

[Joel Schreiner]

Thank you again for all the help I will let you know how it goes.

[T_MALENA]

Hey, I'm from Ohio. F.2 as in inches not mm.

[Harryman]

8000 RPM is not really enough. It's only about 12.5 surface feet/min.

 

I'd feed about .00004"/rev and peck .003"

 

Good luck.

[Fig sign]

I`ve drilled 0.25 mm with a machine s4000 max rpm

My current machine has 8000 max and I work with mills and drills of any size (it does not matters my boss that there are not enough RPMs)

You can do it and you would !

[Threept82]

I've drilled .008 dia holes .15 deep in 316ss.

I had best luck with S7200 F.6 Q.016, not much difference from 304

[Joel Schreiner]

Could not find a centre drill small enough so I didn't use one. Finished the job last night everything worked out great.

thank you for all your help.

Joel