Sure is quiet in here....do I need to start a fight?

Stihl 041S · Mar 14, 2014

That's not a big drill at all.

3" and 24" long......... That's getting there.

We have 4 1/2" HSS spade drills and then carbide insert drills.

The super drills are cool. Sort of a tube.

farrell · Mar 15, 2014

Spade drill I ran was 1.25" shank with changeable carbide tips to 2.5" with coolant thru tooling

It made a hell of a mess

Ran it on a open horizontal mill with a four foot square table

Set whole plastic injection molds on it for machining

Stihl 041S · Mar 15, 2014

farrell said:
Spade drill I ran was 1.25" shank with changeable carbide tips to 2.5" with coolant thru tooling

It made a hell of a mess

Ran it on a open horizontal mill with a four foot square table

Set whole plastic injection molds on it for machining

Yup. Insert drill.

The super drills have 9 inserts in 3 sets of 3.

Big slug in the center. More even speed on the inserts.

farrell · Mar 15, 2014

One place I worked we made bore drill heads from 6"-12"

They used carbide inserts in the face and carbide wear pads on the side to keep it them running true

Coolant through tool

Heads were hallow and cut outs on face so chips would come out through the tool

I was told they were for 20' or longer drills!

Stihl 041S · Mar 15, 2014

farrell said:
One place I worked we made bore drill heads from 6"-12"

They used carbide inserts in the face and carbide wear pads on the side to keep it them running true

Coolant through tool

Heads were hallow and cut outs on face so chips would come out through the tool

I was told they were for 20' or longer drills!

One I know of was 50' long.
13" OD
10" ID
"Scrap" Bar in the middle weighed 13,300 lbs
And 9,200 lbs of chips.
HP needed for coolant pump equals that of the drill itself.