drill on Kovar

[CNC-ERIC]

I will have a job, material is Kovar, size is 3.8x4.0x28mm, in the center there is a hole dia 2.6mm, and on the side there are two 0.6 mm holes,

what kind of drill suggested to use, cutting speed and feed ,peck depth?

 

 

TIA

 

Eric

[Robert Ouellette]

kovar is nasty stuff. tons of cobalt 30-40% if i remember right. only luck i had was with name brand cobalt drills 50-60sfm and push like stainless.we used osg ex-gold, but guhring and others good drills will do it. make sure your coolant is in the 8-10% also. and good stuff also. do not rub it cut it. we had great luck even form tapping all the way down to 2-56. just remember to cut not rub. or you can chuck that piece in the trash.

[elbro]

Here is some info i have on Kovar.

 

Carbon .02

Nickel 29.0

Iron Balance

Silicon .20

Manganese .3

Cobalt 17.0

Aluminum .10

Zirconium .1

Titanium .1

Phosphorus .025

Sulfur .025

 

Tensile 85,000

 

If I remember right this didn't machine to bad. It was a little gummy, I would use Carbide for just about everything. Just like Bob said make sure you don't rub, with the Nickel you want to be cutting.