28-02-2015, 07:22 PM
(28-02-2015, 07:44 AM)JJ0063 Wrote: Poundland!
Il never forget the day I knocked the drill onto hammer setting & then tried to drill a number plate with a pound land drill bit... The bit literally 'unravelled' if that makes sense? It looked like a straight piece of metal & it was only used for a couple of seconds until I realised it was hammering!
That is how most cheap drill bits are made to be honest, twisted then just hardened and ground on the tips, higher quality bits will be ground straight out of a HSS blank. Whilst cobalt can take a bit more heat, they also usually have a much thicker web for strength, which means hand drilling will take a lot more thrust to cut compared to more normal drill with a thinner web.
Get something HSS, 135* point angle and ideally with split point tips, Heller, Dormer, Osbourne, Titex are all damned good quality without being insane price wise, and if you look after them should last you many years even drilling hardened steels, titanium alloys, etc.
Then buy a cheap set of ebay specials for those shitty jobs where you need to knock them in with a hammer and don't care if they die.
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