Clever Chinese...................

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They are not Chinese - Japanese!
 
Quite simple concept to get a square hole, but just needs some well engineered kit with the right control philosophy:D
 
Notice the tool still leaves radiused corners though, only a recipricating chisel will give truly square ones.
 
Notice the tool still leaves radiused corners though, only a recipricating chisel will give truly square ones.

Exactly. The nature of a drill is that it only rotates. This is a CNC mill with a specialised bit and the right software instructions with complex controls on rotation and direction synchronised with exactly where the cutting edge is on the rotation.

BTW, i did not get 'borked' on my ipad with this link:thumb:
 
Now where did I leave that box of square bolts? they were definitely around here the other day!:doh:
 

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