Leading Screw Suppliers in South Africa - Screw
2015-3-29 · Drilling: For our project we used high speed cobalt steel drill bits. The holes were around 40mm deep. This lead to some very interesting issues. Peck drilling is essential as the 3.3mm pilot holes would need clearing every 3mm or so and full retraction allowed coolant to be forced all the way to the bottom of the hole.
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