Drilling .062 holes in A2

[cncworker]

I have to drill .062 diameter holes, 136 X, .63 deep/thru in A-2, not hardened.  I talked to MA Ford, just looking for some more leads/input on what drills others have used for similar cases.  Thanks.

[crazy^millman]

SCT, Ghrung, Titex, and a few others.

[BillKobernus]

Precision Brand.  These have a nice split point design.   Second choice, Gurhing.

 

No matter what brand you choose, always look at the point under a microscope to make sure they were ground on center.

 

Bill K

[cncworker]

Thanks for the input.  I have presented some options to the boss, now up to him.  We'll see what he chooses.

[crazy^millman]

Thanks for the input.  I have presented some options to the boss, now up to him.  We'll see what he chooses.

 

I would like to know and what were your results with that choice. Thanks.

[Fred @ Slate Industries]

 Wire Start holes ? 

 Any who .0625    We would just by a envelope full of std. black  "Precision Twist brand "  drills and throw each one of  them out after every ten holes etc.

You will be fine.

There Too small to re sharp even in a high end Darex in my experience.

"Perishable tooling "

[cncworker]

We ended up getting the drills from MA Ford, ( ordered from MSC online) Series #205,  MSC part #20506250.  

It is a carbide drill with 135 degree point, .625 length of flute.  I programmed it for 6000 rpm, 12.0 feed.  .02 peck.

Had 134 holes to drill.  I changed drills half way through.  Never broke, just wanted to make sure had a fresh drill.

Not sure what the holes were for.  Not wire edm starters though.  Possibly, the customer was blowing air thru them.

Yes we will throw them away, although they still looked sharp.