Drill bits

Discussion in 'Engineers' Talk' started by capnpugwash, Dec 18, 2003.

  1. capnpugwash

    capnpugwash New Member

    I need a few good drill bits to drill loads of holes in a steel lintel. Also getting tired of carrying round loads of cheap old junk - like the screwfix "titanium" coated set (D10764). Think the titanium is actually toffee for all the effect they have. Any suggestions?
  2. kesh

    kesh New Member

    Hi Capp'n, how's young Master Bates?

    Only suggestion is to drill a small hole first & gradually increase Dia. What's the final hole size?
  3. SnapOnMan

    SnapOnMan New Member

    Have you seen Seaman Stains recently?! :)

    As Kesh said, what's the final hole size? How fast is your drill going? The larger the hole, the slower the drill speed and feed rate. Are you putting too pressure on the drill? Are you using a cutting lubricant?

    Buy some quality drill bits - they'll save you money in the long term. Try Dormer Series A002 which are a very good all purpose drill bit. If you want to spend some more cash, then invest in a set of Cobalt drill bits. These are suitable for drilling stainless steel so will go through your lintel easily.

    Notice the set you mention is Titanium coated - it's only a very thin layer (microns) so doesn't make much difference to the strength of the bit itself. It is there to conduct heat away from the cutting edge of the tool and provides a low friction surface that reduces wear and hardens the cutting edges.
  4. Errol Johnson

    Errol Johnson New Member

    Best ones are Ruko from Germany (37 years experience) not sure who sells them now. Every cheap bit coming out of China has TiN coating - but as you say - they are no good.
  5. capnpugwash

    capnpugwash New Member

    Had a word with Roger and we would like to make it clear that a seaman's stains are a personal matter and not for discussion on this forum. You might be a bit stained yourself if you'd be tossed in a black pig. I digress.

    Holes are 7mm, mild steel lintel. A decent drill should go through like master bate's best bilge water curry.
  6. diyhopeful

    diyhopeful Active Member

    Axminster sell individual cobalt drill bits that should drill through a lintel no problem. I've used titanium and the cobalt ones seem better.
  7. WOLF

    WOLF New Member

    you are using a high melt point lubricant on the drillings to assist are you not(well we hope so!!)and a 7mm in steel should be done in 2 passes(according to table of drills/steel)3.5mm, then 7mm.....table was printed when steel was steel and not toffee coloured ally
    and taplow is good for cooling....

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