U drills

[pressbrake1]

You need power to drive them.

Ran a 40mm Tungaloy through cast iron today. Probably 90 seconds to go 2" deep.

Thats on a lathe with 30 hp spindle

What lathe was that?

 

[pressbrake1]

I use u drills on the Devliegs in cast iron , seem to use less power than twist drills in iron and I can use relatively high rpm.

Not any fun on a manual lathe in steel as you can’t be near it though I have a job where I have a u drill in the dsg tool post so I punch through without messing with centre drill then offset on the dro to finish bore much like a cnc

If you really want insert tooling get a spade drill but as a hobbyist do you really want to bother

 

[Brad93]

What lathe was that?

Harrison Alpha 1800S

22% spindle load

 

[pressbrake1]

good job shop machine until bed wears then they kill lead screw ball screw nuts

 

[Brad93]

good job shop machine until bed wears then they kill lead screw ball screw nuts

It's worn by the chuck, it's done cast and spray work with no maintenance.

Shame really im really starting to like it

 

[Brad93]

Looks like they don't even make anything as big as the 1800S now.

Swing over bed 800mm
Spindle 35hp
120mm spindle bore
2m between centres

Must of been a fortune new, it's got all the sizes of steadies and three jaw/four jaw. I think they bought it used