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Solid carbide screw drills

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Rob.Wilson:
Hi anyone used these   http://www.cromwell.co.uk/quicksearch?search=solid+carbide+screw+drills+&x=54&y=9

They have them on special  at the mo ,,,,,,,,,,,,,,,,,, may come in handy


Rob 

andyf:
Quick, Rob - tell AdeV! I think his aluminium sump still has broken taps in it.

Andy

John Stevenson:
If Cromwell have them at that price someone will have them a bloody sight cheaper.

Rob.Wilson:
But are they any good  John  :scratch:

Rob

one_rod:

--- Quote from: Rob.Wilson on November 07, 2010, 03:53:48 PM ---But are they any good...  :scratch:

Rob

--- End quote ---

Yes they are.  :thumbup:

Well the ones we use at work are. (We don't buy them from Cromwell's either)

Will tear through almost anything, no matter how hard or abrasive. Ideal for use use on stainless, titanium and high-carbon toolsteels.

A bit of a pain to sharpen, you need a green carbide or diamond wheel on your grinder. And a bit of patience.

They will stand an incredible amount of axial pressure when drilling, but they are brittle and will shatter or snap from any off-axis load. So on "difficult" materials they are best used in a pillar drill with the work firmly clamped.




one_rod.

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