What would you recomend for the best "Center Drill Counter Sink Bits"

358Scout

358Scout

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Christmas is coming and my son just purchased his first milling machine.
One of the things on his Christmas list is a set of "Center Drill Counter Sink Bits" in mm's.
Any suggestions as to which brand you would recommend would be appreciated.
Money is no object.
 
Center drills are typically for lathe applications. I use spot drills for drilling holes on a mill. Spot drill at 118 degrees, drill point is 118 degrees. Center drills have a 60 degree angle which is not an ideal lead for a 118 tip drill. Don't buy any Chinese ones, try and get some North American made stuff. Magafor makes some nice ones I think. This is all assuming he wants them for drilling holes of course.
 
Magafor makes some excellent countersinks too. For US made, Champion Cutting Tools or Michigan Twist Drill. Both are top shelf.
 
These are what you're looking for;

h ttp://www.amazon.com/Anytime-Tools-CENTER-COUNTERSINK-Tooling/dp/B000N216SU

As usual remove the space when you cut and paste the URL.

Oddly enough the are correctly referred to as just "center drills". But it seems as if folks have added the "countersink" name to them even though they are the wrong angle for any sort of proper counter sinking job. The angle they cut is intended to accept a lathe center and not a screw head. Hence the proper name being JUST "center drill".

The 5 piece set isn't something you'll commonly find in your average lumber yard tool section. Generally you'll need to find a place that sells industrial tools to machine shops or find a Busy Bee,KMS, KBC, Acklands-Grainger or some other similar industrial place.
 
On a slightly related note, I needed to countersink some screws in aluminum a while ago and got a couple of Weldon "zero-flute" countersinks, which are excellent- far better than the multi-flute ones, with no chattering. I paid about $14 USD each (at Hardware Sales in Bellingham) so that set on Amazon is a good deal. Grizzly Tools (and probably Busy Bee) has similar ones but they're probably Chinese. These are US made.
 
Are you looking for a combination center/spotting drill or a 90° metric countersink/spotting drill? Once is common enough available at all machine tool supply centers. The other is a specialty tool that doesn't leave our cnc area and is typically used prior to a thriller. UB, sowa, morse, Cleveland, and several euro brands are all commonly available all good until you spin them too fast or push them too hard. As usual I recommend buying from a machine shop; they may charge a few bucks more but they have the buying power to get you what you want, our shop does it all the time for walk ins.
 
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