They don't cut as well on Mild Steel, Aluminium and Brass as ordinary drills, like the Presto jobber set on ebay. Good for difficult materials like Stainless and hardened steel. The cutting edge is like a masonry drill, with a shallow angle to reduce wear, and the flutes are extra thick which increases friction as holes deepen. Īh ha! The RDG set are 'Heavy Duty' drills, which are for punching through hard materials. i don't know what if anything is wrong so help me understand i have the correct drill set. Why the big price difference and why the different case they are in ? are they the same bits ? thanks guys. i found them on Ebay, are they the same and if so look at the price difference. I bought them from RDG but the set that came are these. so i done a bit of homework and i don't know what if anything is wrong so help me understand i have the correct drill set. Hi guys it was me who rang Noel to tell him i was having a lot of bother using the drill set i bought. A 'good' maker is producing lots of dud drills? Have they gone south, or could the drills be a specialist type?Ī picture would be good - the angle, grind-type, flute arrangement etc might reveal all. But then a tool-seller independently produces another example, which implies it's a common problem. Strange - a £100 set of 'good' drills are all faulty? Might be counterfeit. HeY Speedy, Do warco or chester supply a drilling machine to run these drills ? Noel And the same again in carbide before you even get onto the indexable ones. I think Dormer have over 50 types of HSS drill bit and that is just familiar twist drill style not the odd ones like spot, step, csk, etc. The good brands have so many different spec drills these days a lot depends on which one you go out and buy as to whether you get their DIY or Quality offerings. I once bought a set of Guhring (spelling ?) drills 6mm to 10mm by 0.1mm From the start I had to grind nearly all of the to get them to cut.Įven the 'good' brands are having to go cheap on their process to compete so you will get more & more crap hitting the consumers, and yes this problem filters though to industry as well. Does the package mention material and Country of Origin? I have a set of HSS bits that I bought decades ago, made in West Germany (remember that?!), that cut really well. I have several sets of cheap Chinese bits that cut poorly until I properly sharpened them. Has anybody else had this problem ? It's a new one on me ! Noel. Mentioned this to a local tool stockist today and he said look at the bits, and handed me an 10mm, I COULD NOT BELIEVE MY EYES ! It had been sharpened to a chisel edge, like a rotary percussion drill bit - then coated ! This was not a cheap bit, of 4 facet or split point design !!!! He had invested in a GOOD set of drill bits - over £100, and found first he could not drill a 8mm hole in steel, then tried to drill 13mm in alli - NO GO ! I offered some suggestions but had not thought of this one ! A friend called me to ask for help ! New to engineering, and had bought a lathe.
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