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December 2009

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Subject:
From:
James Head <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, James Head <[log in to unmask]>
Date:
Mon, 14 Dec 2009 09:16:10 +0000
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I had to create the tooling once for a board requiring square holes.  I done exactly what Robert also suggested and drilled small diameter holes in each corner then routed using a normal routing tool.



This caused a lot of debate within the CAM department of the company where I'd remembered learning about special drill bits that could drill square holes based upon the releaux triangle.  No-one believed me!



The solution drilling the four corner holes also created some debate with a couple of people rightly saying that there could be a small dimple where the rout tool and drill bit meet so our team leader spent a good couple of hours working it out on paper before declaring it wasn't enough material to take notice off.  Actually he said it somewhat differently in a phrase involving a "gnat" which I can't repeat here.



James



James Head BEng CID MIIE MIET

Senior PCB CAD Engineer

Crowcon Detection Systems Limited

2 Blacklands Way

Abingdon Business Park

ABINGDON

OX14 1DY



Telephone:      +44 (0) 1235 557700 extension (9) 289

Fax:            07092024504

Email:  [log in to unmask]

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