Best drill bits to get?

[Nick 50]

I have a snapped bolt on the VFR which holds on earths. So I need to get it out and replaced.

What are the best type of metal drill bits to get?

I've seen Cobalt, Titanium, DeWalt Extreme ones etc etc, but not sure which are best for the job?
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Current Bikes: ZX7r 97 (Black Beauty), VFR400 NC24 (The banana)
Previous Bikes: Aprilia Tuono 03 (The Beast), CBR600f (97)
First bike: A GZ125 Lemon.......

[The Artist]

Cobalt I like. Cut through mild steel like cheese but are expensive. Also brittle, I snapped a 13mm cobalt bit the other day just by catching a burr wrong.

[Pete.]

If the earth strap bolt as sheared, why not simply put the earth on a different bolt?

And why the hell post this in Dear Auntie?
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[c_dug]

Standard drill bits will do the job fine, I use a few types at work but only really notice the difference when drilling through hardened steel.

I'm not sure drilling out should be the first port of call though and I'm talking from experience here. If you don't know what you're doing it is very easy to make matters worse.

As mentioned maybe look at relocating the earth for the time being and looking at other ways of removing the stud.
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I am a bellend, I am a man of constant sorrow, I am a gummy bear, I am a rock.

[Rogerborg]

I like my cobalt bits. I haven't snapped one yet, and they demolish mild steel. Cost is fine if you factor in your time.
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[Polarbear]

[BTTD]

HSS for mild steel and soft metals, and cobalt for stainless.

[h00dwink]

[Polarbear]

[Raffles]

[woll]

Personally I'd use cobalt for drilling any metal. I always find HSS even expensive ones snap too easy and go blunt as soon as they look at something hard.
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Current Bike- Suzuki DRZ400 SM K6
Previous bikes - Derbi Senda Xtreme50r, Honda CBR 125, Kawasaki ZZR 250, Yamaha DT125R, Suzuki Bandit 600, Gas gas ec 250, Honda CBR600FW
Damaged spleen, damaged kindey, 2 popped lungs, 2 broken ribs, broken face, broken wrist and 5 back fractures... remember kids walls hurt

[kramdra]

Solid carbide for win. They are significantly more brittle compared to HSS/HSS-Co, but they are good

For low accuracy, you may be able to cheat with a masonary drill

Dont waste money buying drills with surface coatings like titanium.

[Azonicben]

I'd be trying an "E-z out" first if its a snapped bolt.

https://www.toolstation.com/shop/Power+Tool+Accessories/Speciality+Drills+Chucks/Screw+and+Bolt+Extractor+Set+5+Piece/d80/sd1400/p51010
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Cbt-23/09/07.....Theory-16/09/08.....Das passed 10/10/08.....
Current bike- GsxR750 K4. Broken: Cbr400rr (Nc29) Sold: Hyosung GT125R

[Raffles]

[MarkJ]

Cobalt bits are awesome

[Nick 50]

Cheers for the replies.

I trundled off to machine mart yesterday in the hope of getting some Cobalt ones they have advertised online. Got to the place and quickly realised the staff are extremely well trained at being the most miserable unhelpful *beeps* i've experienced in a while.

I've ended up with some Titanium coated ones (then came back and read kramdra's reply) oh well
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Current Bikes: ZX7r 97 (Black Beauty), VFR400 NC24 (The banana)
Previous Bikes: Aprilia Tuono 03 (The Beast), CBR600f (97)
First bike: A GZ125 Lemon.......

[spikenipple]

There's nothing wrong with that, the TiN coating helps reduce friction and consequent heat build up, which will blunt the drill quickly if not controlled.
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