Drilling advice

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  1. #11
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    Quote Originally Posted by 21William View Post
    A centre drill is better than nothing to start a hole but I prefer a spotting drill. 6mm or 8mm is a good size, they aren’t very expensive.

    HSS 8% Cobalt 90 Deg Uncoated NC Spot Drill D2306 | Cutwel Ltd - Drill Suppliers
    I haven't seen those before, will be ordering one tonight. cheers William

    Pat


     
     
  2. #12
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    I like the centre drill with its shoulder champher cut as well as its sturdy construction, a range of choices in sizes.

    Peter.
    Nil Desperandum

     
     
  3. #13
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    I do the same as Pat.

    COOPER 01/08/1998-31/01/2012

     
     
  4. #14
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    Quote Originally Posted by xjr1300 View Post
    I haven't seen those before, will be ordering one tonight. cheers William

    Pat
    The clue is in the name really. A spotting drill is for accurately spotting, or starting a hole. A centre drill is for making a recess for turning between centres, it generates clearance for the tip of the live centre.

    I was turning a very small component on my metal lathe some years ago and when complete I couldnít help notice the hole in it was not concentric. Iíd used a centre drill to start the hole off and it obviously wandered. After it landed in the bin I ordered a couple of spotting drills and Iíve never had the same problem again. The replacement part was spot on!

    I use a Metal Lathe and a Milling machine and use spotting drills for every job that needs a hole in it.

     
     

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