Help !!!! 3 Flute Drill feed and speed

[Lars Christensen]

Hi guy's,

 

Now I have my hair in the mailbox again.

 

I got a production job, were I need to run a .531 diameter 3 Flute(Lips ) carbide drill in Aluminium 1" deep.

Now this drill was provided by the customer, with the message that they are running it at 7500 rpm and 90 Ipm. What sounds crazy to me(but what do I know )

The Drill is going to run on a Kita Mycenter, were I think the customers machine is much more regid, and they have more Hp.

 

Problem:

They send me only one drill, and I GOT to get this drill to work.

 

I beg, can someone please give me a thumps up on the 7500 rpm, or alternetive feeds and speed (I dont care about cycletime, just that the drill will not brake).

 

Thanks

Lars

[specv]

That sounds pretty close to what we run.

Is is coolant thru?

also make sure you DO NOT spot drill these holes before you drill them, you will break the corners off if you do.

[Rob Peirolo CNC Software]

Lars,

Here in our shop we are running a .390 dia Kennemetal TX drill through 1.200" of aluminum in a Haas VF3 at 7500 RPM @ 50 IPM.

So those parameters don't sound too far off.

 

Rob

[mrainey]

If you do the numbers, that figures to 1042 surface feet per minute at .004 inches per flute (.012 inches per rev). Power figures to be about 5.5 HP. So, it really is in the ball park for a modern, high-performance carbide drill in aluminum.

 

Make sure you have no more than a few tenths runout at the drill tip, or you're inviting it to break.

[Lars Christensen]

Thanks guy's

 

I Will make sure that there is a cold one with your guy's name on it in the cold closet.

[robk]

Lars,

Here is a link to Guhring series 5518 3 flute solid carbide drills. It's a .pdf file, if you go to page 280-281 it has the recommended speeds & feeds for it.

Link

[Lars Christensen]

Thanks robk,

That is saved in my "Do not delete folder"

 

Thanks to all of your help, the truth is that I have never seen a 3 flute drill before, it work good.

 

Lars