SPEED FEED?

[smokey_44]

I'm not sure about a speed and feed ,please help...1.875 dia carbide tip spade drill , 4140 prehard mat ,speed and feed where I could start ?

 

 

Thanks Dave

[chris m]

Carbide that big? If you're sure then I'd try about 250 RPM and .010-.015 IPR

 

That's gonna take some big thrust to push....

[smokey_44]

if ya didn't notice its a insert type not soild ,thanks alot

[Matt Berube at Ferron Mold]

Who is the manufacturer ? Don't they have charts on the internet ?

 

We use these drill inserts

 

Allied Machine

 

Maybe you could use their charts ?

[desmotom]

I would go slow around 200-300 rpm and slow feed .005-.01 ipr, going to make some noise probably

[Jimic]

I ran Carbide spade drill 1" dia on 4140 material at speed 900 and feed 5.0 pecking at .20 deep. 3" deep hole. We have been using it for more then 50 holes on the Vertical CNC Milling Machine. Working fine without changing insert.

[chris m]

Dave, I did notice, but I don't think I've seen a spade insert that big in carbide; just wanted to be sure.

[Guest SAIPEM]

Spindle-thru coolant plays a big part for spade drilling.

If you don't have it, don't push the tool.

 

Without knowing the tool manufacturer or the machine model, I'm inclined to err on the safe side.

 

 

MATERIAL: Alloy Steel 4140 - Resulfurized (300-375 HB)

SURFACE SPEED: 98 FPM

DRILL MATERIAL: CARBIDE

DRILL DIAMETER: 1.875

LOAD PER FLUTE: 0.0029

NUMBER OF FLUTES: 2

SPINDLE SPEED: 199 RPM

FEEDRATE: 1.1542 IPM

REMOVAL RATE: 1.37963 in³/min

POWER CONSTANT: 0.89

HORSEPOWER: 1.44455

[chris m]

You need to feed a tool that big or it is going to be LOUD

[Guest SAIPEM]

quote:

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You need to feed a tool that big or it is going to be LOUD

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Absolutely false

[terry5357]

Being from the South and oil filed country, spade drilling used to be a way of life. Everything had at least a 4" dia hole at a minimum of 12" deep. If there is a good grind on the insert it will make almost no noise at all. 200 rpm and .005-.007 feed with through coolant and it will "putter through that 4140 like it was butter.

When the outside edge gets dull ( and it will after several holes) then stand by cause it will do one of three things, break, blow your eardrums out with squeel or get stuck in the hole if it gets too hot. The Most important thing with a spade drill is chip evacuation and higher consentration of coolant. If you are mixing 20 to 1 make it 15 to 1.

A spade drill is a bad*ss piece of machine shop equipment if you take care of them.

[smokey_44]

Thank you all for your comments , I went ahead and programmed 90 rpm feed .6 ipm , I used a peck drill cycle .1 step down for drilling X 6" deep. It worked VERY well , Load on machine was about 75% and it cut only .005 big on dia (wow) ,I was kinda suprised how close it cut to the size ..only .005 big on dia!!!! NO NOISE at all with these parameters.

 

Again THANK you to all who helped point me in the right direction.

 

 

Dave Ferraro