I was Impressed by a DRILL BIT Today

[rake60]

This new high tech drill bit was brought into the shop where I
work for a test run on one of our CNC machines.
It's a solid carbide bit with holes through it to deliver the coolant to the
cutting point.
It's basic size was .312" The job it was to be tested on calls for two 5/16"
holes drilled in one face. The standard HSS drill bit at 40FPM or approx
500RPM was taking 41 seconds to drill each hole.
This new carbide bit was drilling the same hole in 3 seconds.
250FPM or approx 3080RPM.
It was amazing to see, but I still have to wonder what the results will be
the first time a catastrophic failure of the bit occurs.
I certainly wouldn't want to have one running in front of ME on a
machine that was not totally enclosed.
But at any rate, the latest trends in industry sooner or later trickle down
into home consumer products. It will be interesting to see if this one will...

Rick

 

[compound driver]

Hi rick
Been using drills like that for a few years for deep drillings superb and the only way to get coolant to the tips.
Do a google for "Horley drill services" Its a UK company so not much use to you but the selection of drills is incredible and worth looking at for interest. There down the road from me thankfully.

Cheers Kevin

 

[rake60]

That's interesting reading Kevin.

We have one job that calls for a 7/16" hole drilled 14" deep in
4340 alloy steel. It's not a job we fight to get into our machine!
By the time you hear it snag a chip it's all over...
You hear a growl a crunch and the machines control screen reads an
OVERLOAD alarm.

I understand they have tried gun barrel drill bits for at least one deep hole
application, but the machines coolant pump was not capable of producing
the pressure the bit required.

And then at home, I'm squirting cutting oil out of an oil can. :roll:
But, still always looking for a better way!

That brings another thought to mind. How did you Elbow engine builders
drill the long 1/8 holes through the base and upright supports?
I didn't find that entertaining at all! LOL

Rick

 

[compound driver]

Hi rick

I have a long series 3mm three flute drill (9 inch long) with an extra 5 inches added hat was made to drill a block of 2011 end to end. After drilling both ends of the hole had to be with in 20 thou of the mark. The way i went about it was to use as many RPM as the machine would give me and tallow packed into the flutes of the drill. Every inch the drill was withdrawn swarf cleared and tallow re applied. managed 14thou on the first go.

Gun drills are ok but dont like high RPM two flute are slightly better at high RPM and a three flute just works perfectly.

Try going to three flute and see how yo get on. Il post a picture later of one drill that was bought for a single job its a three flute 2 inch 11 inches flute length on a 4MT.

Cheers Kevin

 

[Bogstandard]

I think the top drill is the type you are on about, solid carbide, four facet with lube holes right thru.
With your reference to drilling these engine holes, for the elbow I knocked off 4" from a 12" long series 1/8" and silver soldered it into a brass holder, did the job in one hit.
For the 2mm back holes for the flame licker I just silver soldered on a bit of 2mm rod, using a pair of v blocks to keep them aligned, then just polished the shaft to make sure it didn't bind when drilling.

John