Kiwi2wheels
Aluminum
- Joined
- Jan 12, 2008
- Location
- Orlando,FL, USA
Hi MattiJ,
Could you please provide a link to the manufacturer of those cutters.
Could you please provide a link to the manufacturer of those cutters.
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Hi MattiJ,
Could you please provide a link to the manufacturer of those cutters.
Krino is the only "reputable" manufacturer I'm aware:
Tools for cutting metal - Krino spa.
keeping the drill centered and not chewing around like blind beaver.
So I'm pretty sure now that in some dimly lit conference room, thick with cigar smoke, there are a group of Billionaire tool manufacturers laughing at the ridiculous price tag they throw on multi-size sheet metal step drills. I just paid $60 bucks for a 3/16" - 1" bit..... And it appears they have all agreed never to manufacture them in carbide, because if the bit would stay sharp for a little while, then they wouldn't be able to sell you a new HSS one for $60 when your buddy roasts your bit trying to drill a dry hole through 3/8" 304 Stainless... End rantView attachment 138534
typical small drill press has low speed of 500 rpm for normal 1/2" hss drill and obviously you would be going too fast with a 1" dia unibit
That's 130 FPM, which is not too terrible for HSS, unless drilling stainless.
.I wonder how a sintered (pressed) carbide version would fare. With no real machining required, there might be some cost/price logic to it.
I work on a state highway sign crew and we use the smallest size ones (1/8-1/2") to drill everything from single signs to gang stacked signs, extruded Alu zee bar, even sch.40 & 80 pipe and W-beam flanges using a cordless impact driver and whatever cutting paste we have on the truck for ferrous and WD-40 for Alu.
We predrill if we think it warrants it and go through 1-3 bits a year per truck. Irwin brand cause they have the 1/4" drive with the ball detent like the drivers.
I didn't think that they would last as long as they do but it works. Maybe because the impacts effectively slow down the RPMs as they gain diameter? maybe someone can explain it to me, or tell me how I'm doing it all wrong and I'm going to get my man card revoked for abusing a step drill.
Since the Op has posted their "Conspiracy Theory", HF has deluged the
market with a 3 pack of Chinese made copies, for $8.
2 flute instead of the original single flute, Gold paint coated too.
So the whole subject is null & void.
The HF step drills are absolute crap!
They do not even have proper cutting geometry and leave heavy burrs on the back side of the hole.
For really fussy stuff like an electronics panel I use my real Unibits and for rougher work the Irwins. FWIW I occasionally hand hone the face of the cutting edges which greatly improves bit life.
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carbide is brittle.
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i always laugh when somebody wants to use carbide hole saw on steel with a hand drill. usually doesnt even last one hole.
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some of us actually can make a unibit last over a 100 holes without saying anything about a conspiracy
Where step bits excel is in enlarging existing holes.
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