[ARC5] Hole for octal socket ... Try Unibits

[Leslie Smith]

  Hello List-readers,
  Tom referred to ''step drill bit".  These are also known as stage
  drills, and are ideal for drilling holes in aluminium, diecast
  muck-metal and so on.
  See eBay items 171067157128, 291347176512, 361041784417 for examples.

  I have used these for many years in hand-drills and a drill press.
  Set the drill speed to low RPM, let the drill do the work (don't press
  hard) and you'll get good results.
  Stage drills do not drill stainless easily unless you can get the
  speed REALLY low, eg 25 to 50 RPM.
  Use a lubricant with stainless.  (or buy a hole-saw with tungsten
  tips.)


  73 de Les Smith
  vk2bcu at operamail.com


On Wed, Feb 4, 2015, at 03:52, Tom Bridgers wrote:
> Have used Harbor Freight's Step Drill Bits with much success in making
> 1-1/4" inch holes in an aluminum chassis for octal sockets.  Their 1/4"
> to 1-3/8" Unibit will easily get the job done using either a dill press
> or hand drill.  A 2-bit package costs about $19 on sale at HF.
> 73,
> Tom. KE4RHH
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