alphatune
Member
Another shout for presto drill bits or Miwaulkee thunderweb bits are good as well
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the Daily hi thread
Drill bits
- Thread starter Mark ovenden
- Start date
Sarge
Member Extraordinaire
The joys of cheap jobber bits.
Yes, it twisted back on itself, and it wasn't even warm.
Not to self: buy better bits.
I use these with excellent results
Rennie Tools also make an excellent product in a variety of sizes
Rennie Tools also make an excellent product in a variety of sizes
Si Titor
Member Extraordinaire
Yes thats a horrible nasty drill bitView attachment 924944
The joys of cheap jobber bits.
Yes, it twisted back on itself, and it wasn't even warm.
Not to self: buy better bits.
Si Titor
Member Extraordinaire
You can often pick up hardly used and unused Dormer and other well made drill bits and sets of on ebay.
YorkKnife
Keen member
Best I’ve used so far are Abracs cobolt if I’m going to 8mm hole I’ll start with a 4mm then a 6mm before I get to the 8mm. I normally drill through knife tangs daily in annealed stainless and carbon steel at around 4mm thick. Don’t forget about drill speed as well often overlooked.
Can’t stress how much difference learning how to resharpen a drill bit made to my bank account lol
Luke
Can’t stress how much difference learning how to resharpen a drill bit made to my bank account lol
Luke
Paul SE
Member Extraordinaire
In the Mil - Aero / Defense manufacturing we use OSG drills and endmills quite a lot.
https://uk.osgeurope.com/drills
And also Sutton:
suttontools.com
The OSG EX-GDS stub drills we use are self-centering and we would add a chamfer to the hole afterwards with a centre drill or chamfer tool of the desired angle.
We also use a fair amount of Guhring drills too, they’ve always been ok to use in all manner of metals.
https://uk.osgeurope.com/drills
And also Sutton:
Drills - Carbide - Sutton Europe
suttontools.com
The OSG EX-GDS stub drills we use are self-centering and we would add a chamfer to the hole afterwards with a centre drill or chamfer tool of the desired angle.
We also use a fair amount of Guhring drills too, they’ve always been ok to use in all manner of metals.
Guhring are excellent, in most cases on a par with presto and Dormer at a better price.In the Mil - Aero / Defense manufacturing we use OSG drills and endmills quite a lot.
https://uk.osgeurope.com/drills
And also Sutton:
Drills - Carbide - Sutton Europe
The OSG EX-GDS stub drills we use are self-centering and we would add a chamfer to the hole afterwards with a centre drill or chamfer tool of the desired angle.
We also use a fair amount of Guhring drills too, they’ve always been ok to use in all manner of metals.
Squintykid
Super member
Another for stub drills and (more) pilot holes
I've used Osbourne/ Europa carbide drill bits for a couple of years, they've been fine boring 10-15-20mm deep holes
in 316 stainless on my lathe, angle iron ( 1950s bed frames) and 4x4 x 1/4" steel angle.
They were fairly cheap, certainly cheap enough to buy 10x in the smaller sizes although it appears that GBR engineering may have closed, their website has disappeared.
www.protool-ltd.co.uk
I've used Osbourne/ Europa carbide drill bits for a couple of years, they've been fine boring 10-15-20mm deep holes
in 316 stainless on my lathe, angle iron ( 1950s bed frames) and 4x4 x 1/4" steel angle.
They were fairly cheap, certainly cheap enough to buy 10x in the smaller sizes although it appears that GBR engineering may have closed, their website has disappeared.
Europa Tools Stub Drill - HSS CO8 Cobalt - 8mm
The Europa Tools Stub Drill in the 820502 series is a high-quality drill bit made from HSS CO8 Cobalt. Designed for precision drilling applications, this stub drill offers exceptional performance and durability. The HSS CO8 Cobalt construction provides increased hardness and heat resistance...
www.protool-ltd.co.uk
If you are snapping a 8mm bit then it sounds like the bit is being bent during the drilling. If that's the case then don't buy cobalt drills as they are much more prone to snapping. Drilling in the lathe or a decent pillar drill, cobalt is fine, when the load is axial, drilling with a battery drill or similar, stick with HSS high speed steel. And buy a jobber length, the shorter ones, if you are not drilling a deep hole. My vote is for Presto, they make some good gear. Presto taps are excellent, and not silly prices either.
As mentioned, the problem with a hand drill no matter how slow you go, a slight movement from the square angle will cause a sharp drill bit to grip and break, possibly causing damage to your wrist depending on the torque setting and how quickly your trying to drill the hole.
Using a blunt drill bit is far safer, you can also save on a cutting lubricant by not using anything, another bonus is that the hole will never be in the wrong place.
Sorry I'm having a bad day
Using a blunt drill bit is far safer, you can also save on a cutting lubricant by not using anything, another bonus is that the hole will never be in the wrong place.
Sorry I'm having a bad day