difference between hss and cobalt drill bits

High speed steel is good for anything from wood to titanium, why titanium you ask.its beacuse the high speed steel takes te heat where carbide will cause work hardening and snap a drill very fast if the piece gets warm. I know it's an old thread, but maybe it will be a timely resurrection for someone I center punch, drill it out with a center drill, and drill to the correct size with a HSS or cobalt drill. I find these useful for drilling big holes. Also, you could purchase a 'center drill' which have hardly any walk whats so ever, as u will see why when u look at them, the 'bit' part is only about a centimeter long, and the body is very thick and are only used to drill very thin pieces or to start a hole.

Get a center punch, give it a little tap or two, and your drilling results will increase dramatically. Even if you get superb 'non walking' bits, there will be enough horizontal lash or play in your drill press quill, that you wont get a precise hole. Doesn't matter what drill bit it is, it will 'walk' when you first plunge it. If you can find a quality set of Titanium coated bits, from a reputable manufacturer and a good price, i say jump on it.Īlso, A-sic Enginerd is right. The Ti coating lowers the coefficient of friction of the bit, and doesn't heat up the aluminium as much which prevents binding or the aluminium welding its self to the bit. Now that being said, a Ti coated bit, is technically superior for drilling aluminium. I have had better results with good quality HSS bits then cheap Ti coated bits The ones i have run into most often are just cheap bits with a substandard coating. I stay away from the generic Ti coated bits, if you got them from a reputable manufacturer then go for it, but only if you can corroborate their claims of quality. If you're looking for something quality, that will last (especially if you take care of them) and don't feel like jumping to carbide, look for a good set of Cobalt Drill-bits, they are somewhere in-between HSS and carbide. ie Peck Drilling (making sure to clear chips in between)Īs for the drill bits. I aim for a 1 inch long chip or so, then back off, then reapply. If you can get a nice long spiral chip coming out, your doing well, and the drill is cutting good and you're applying good pressure with good speed. Personally i just use a squirt of WD40 and keep the cutting speeds low. Generally, Aluminium (depending on the specific type) doesn't need much lubrication, especially with just light work, clearing chips with some compressed air is often enough with 6061T6 Aluminium, depending on the depth/type of cut/drill. Time and cybergibbons are right on the money, the Alcohol only serves to cool via evaporation. Priced almost reasonably in my country and EU, with average street price 28EUR or 36 USD. That has electronic adjustable speed control, and lots of rpm. Something that had never bothered me before, as my power drill on the base, turns with 500/600 rpm per min.īut now, I must seek for an rpm meter so to check my portable Toshiba, įrom my ultra fast seminar, on drills, I discovered and the special board of the specific rpm by drill size, ( with plenty Chrome-vanadium made in Germany tool cases )Ĭrop of the cream, in the European market. Made in China.Įven if the specific drills, are an masterpiece, my moral are damaged, because I belong to the old school, My shopping experience, was a bit of tragic, I had lots of years to go for shopping for such tools.Įven if I got, an product of a brand known to be as German.

The only brands widely known, that do have HSS-G, are BOSCH - DEWALT - HAWERA. to be good quality and last for years, thats why I usually buy tools that are considered as an overkill for the job. Plus, the drill cut ' sides ', to be perfect, so to avoid extra labor of finalizing the hole with hand tools.Īnd last wish. So all holes, to be as much centered as possible, even by a power drill on base , My immediate need are to drill aluminum, by the most perfect way, Internet can offer all the details, to any one with interest about them.

This new generation of Drills offers lots of advantages. īut still expensive in comparison with common HSS. I ended up to the new line called as HSS-G DIN 338.ġ0% cheaper than the know brands with Titanium coated. Thanks for the advices, and I agree with you in all.

Difference between hss and cobalt drill bits