What is the purpose of centre drill and how does it work?

[JasonBModerator @jasonb]

If you look in the J&L catalogue it gives the flute length of the stub drills, this is approx the max you should really use them for. Can’t see a 6.1 listed but the 6.0 has flutes of 28mm which is roughly what I said 5xdia (5×6 = 30)

 

If you do change to a jobber then the normal length Dormer equivalent split point is the A002 series page 35.

 

Just opened the latest J&L flyer and if you want reasonable spot drills as well the solid carbide Hertel ones are on special

 

Jason

[BogstandardParticipant @bogstandard]

Spot Drills at a good price

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